Mitsubishi Electric MSZ-FH25VE-E1 air conditioner
Contents
1. controller Measure the resistance of the vane Short circuit Does OPERATION INDICATOR lamp light gt motor coil Replace the vane motor and the indoor up by pressing EMERGENCY OPERATION Yes Refer to 10 5 electronic control P C board switch No Measure the resistance of the i see i see SENSOR MOTOR SENSOR MOTOR coil Refer 10 5 F I the indoor electronic P C board Replace the varistor NR 11 and fuse F11 x3 Yes Is the varistor NR 11 burnt and the fuse F11 N Y blown 9 Turn OFF the power supply Check both parts side and pattern Be sure to check both the fuse side of the indoor power P C board and the varistor in any case visually N Is the fuse F11 blown only No Yes X1 The fan motor connector s O lead wire is red Y whereas is black Measure the resistance between 3 2 Connect of the tester to fan motor connector s CN211 0 and of indoor fan lead wire and to lead wire otherwise the motor connector X1 X2 resistance cannot be measured properly 3 Please replace the fuse after removing the indoor power P C board from the electrical box Y Is the resistance 1MQ or more Replace the fuse F11 and the No indoor fan motor X3 Yes Replace the fuse F11 Measure the resistance of Is the resistance of Replace the indoor resistor R111 on the indoor2. __ resistor R111 approximately power P C board and power P C board 3 90 No the indoor fan motor Indoor power Fuse F11 Varistor ie P C board NR11 Is the approximately 5 VDC between 5 V and J PG GND of the indoor electronic control P C board Oer Is there approximately 12 VDC Replace the indoor fan motor between 12 V and J PG GND of the indoor electronic control P C CN211 board No Are connector CN102 on the KX indoor electronic control P C Connect the connector or repair discon Indoor electronic SET board or lead wires discon Yes nection control P C board nected Replace the indoor electronic control P C board GND J PG OBH623 D How to check miswiring and serial signal error MUZ Type Turn the main power supply OFF Y Is there rated voltage in the power supply No Check the power supply y Yes Check for incorrect indoor outdoor connecting wiring A B Turn the main power supply ON Check for miswiring broken wires and loose Y No wire connection between the main power Is there rated voltage between outdoor terminal block 51 and 5 2 s
3. 1 Cser which was blink WEEKLY Ma Tu Wed Thu Fri Sat Sun ing goes out and the w current time will be displayed NOTE Press button to transmit the setting information of weekly timer to the indoor unit Point the remote controller toward the indoor unit for 3 seconds When setting the timer for more than one day of the week or one number button does not have to be pressed per each setting Press button once after all the settings are complete All the weekly timer settings will be saved Press button to enter the weekly timer setting mode and press and hold button for 5 seconds to erase all weekly timer settings Point the remote controller toward the indoor unit OBH623 z WEEKLY 5 Press button to turn the weekly timer ON lights When the weekly timer is ON the day of the week whose timer setting is complete will light WEEKL Press gue THER button again to turn the weekly timer OFF goes out NOTE The saved settings will not be cleared when the weekly timer is turned OFF 2 Checking weekly timer setting 1 Press button to enter the weekly timer setting mode ser blinks 2 Press or buttons to view the setting ofthe particular day or number 3 Press button to exit the weekly timer setting NOTE When all days of the week are selected to view the settings and a different setting is included among them will be displayed 9 9 i see CONTR
4. Y Check the wiring If there are any error of the indoor outdoor connecting wire poteit sic celda dd d terminal block 51 and 52 N such as the damage of the wire intermediate connection p 9 9 and or poor contact to the terminal block replace the indoor Yes outdoor connecting wire Is there amplitude of 10 to 20 VDC between indoor terminal block S2 and S 3 Confirmation of serial signal No Yes A Y OFF inverter controlled lighting Is there 2 VDC or less between CN102 equipment and J PG GND on the indoor electronic e Turn OFF the power supply and then control P C board turn ON again Yes No Press EMERGENCY OPERATION Switch Reinstall Ten board CN102 and J PG GND on Is there 2 VDC or less between Is there 2 VDC or less between the indoor electronic control P C CN102 and J PG GND on the indoor electronic control P C Yes board either the unit or the light No away from Is serial signal each other Replace the indoor power error indicated 6 Attach a filter P C board minutes later on remote control receiv Replace the indoor elec tronic control P C board Yes No ing section ofthe indoor unit OBH623 When AIR PURIFYING lamp flashes 2 time When POWER lamp flashes 1 to 5 times while AIR PURIFYING power failure mode is recalled E Check of AIR PURIFYING power After performi
5. Screw of the vertical vane motor unit Screws of the vane motor unit cover Screws of the horizontal vane motor unit Screws of the horizontal vane motor Screws of the horizontal vane motor OPERATING PROCEDURE PHOTOS 7 Removing the air purifying device 1 Remove the panels Refer to 1 and the corner box right 2 Remove the air purifying device 3 Remove the electrical box Refer to 2 4 Remove the lead wire from the water cut 5 Release the hooks of the water cut and remove the water cut 6 Remove the screw of the air purifying device support 7 Remove the air purifying device support Removing the indoor fan motor the indoor coil thermistor and the line flow fan 1 Remove the panels Refer to 1 and the corner box right 2 Remove the indoor electronic control P C board holder the electrical box and the nozzle assembly 3 Remove the screws fixing the motor bed 4 Release the hooks of the water cut and remove the water cut 5 Loosen the screw fixing the line flow fan 6 Remove the motor bed together with the indoor fan motor and the motor band 7 Release the hooks of the motor band and remove the motor band Pull out the indoor fan motor 8 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Photo 9 9 Remove the screws fixing the left side and the upper righ
6. trol system e Miswiring or indoor coil system abnormality trouble of thermistor serial signal Check Flow chart of the detailed Check room temperature thermistor and indoor coil thermis tor Refer to 10 7 Test Refer to 10 6 0 How to check mis Replace the inverter P C board or the outdoor electronic control P C board 10 6 Check of indoor fan motor recall func tion point diagram and voltage 23 OBH623 10 4 TROUBLESHOOTING CHECK TABLE Before taking measures make sure that the symptom reappears for accurate troubleshooting When the indoor unit has started operation and detected an abnormality of the following condition the first detection after the power ON the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes The following indicator applies regardless of shape of the indication OPERATION INDICATOR E Lighted lt Blinking POWER AIR PURIFYING Notlighted Abnormal point Operation indicator lamp Symptom Condition Remedy POWER lamp flashes x 0 5 second ON The serial signal from the outdoor unitis not Refer to 10 6 How to check Miswiring received for 6 minutes miswiring and serial signal er or serial 0808080 The indoor unit is connected to a low stand ror signal by power model after once connected to a 0 5 second OFF non low standby power model Refer to NOTE Minorca POWER lamp flashes therm
7. First release RESET button Hold down the other two buttons for another 3 seconds Confirm that the indicators on the LCD screen shown in the right figure are all displayed Then release the but tons Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 1 SENDING X1 Regardless of normal or abnormal condition UCM a a short beep is emitted once the signal is CERTI Men Tue Wed Thu Fri Sat Sun received 1234 Sor 6 98588 98 Does POWER lamp on the indoor unit blink at the Indoor unitis normal i interval of 0 5 seconds But the outdoor unit might be abnormal because there are some abnor Blinks Either indoor or outdoor unit is abnormal A Beep is emitted at the same timing as the No malities that cannot be recalled with this way blinking of the left lamp of OPERATION OFF Confirm if outdoor unit is abnormal according to the detailed outdoor unit INDICATOR lamp X2 failure mode recall function vei k NOTE It takes up to 1 minute to indicate the outdoor unit abnormality J udgment of indoor outdoor abnormality Blinks Even if the OPERATION INDICATOR lamp is not lighting keep Before blinking does POWER lamp stay ON checking at least 1 minute or longer for 3 seconds Stays ON for 3 seconds without beep Yes The outdoor unit
8. Keep the interlock switch No Air purifying device Not work close ihe ike a screw der 12 5 V DC is generated Turn ON the power supply Is the voltage between CN1T10O and GND on the electronic control P C board OV with the unit stopping Refer to 10 7 Yes v Set the AIR PURIFYING power failure mode recall function Refer to 10 2 2 Y When AIR PURIFYING power turns No Replace the indoor electronic control P C board ON by pressing PURIFIER button once is there after check of the wiring of CN1T1 on the indoor electronic 12 5V DC between CN1T10O and GND control P C board Yes OBH623 31 Electromagnetic noise enters into TV sets or radios lt Is the unit earthed Earth the unit No Yes Is the distance between the antennas and the indoor unit within 3 m or is the distance between the antennas and the Yes outdoor unit within 3 m Extend the distance between the antennas and the indoor unit and or the antennas and the outdoor unit No Is the distance between the TV sets or radios and the indoor unit within 1 m or is the distance between the TV sets or Yes radios and the outdoor unit within 3 m Extend the distance between the TV sets and or radios and the indoor unit or the TV sets or radios and the outdoor unit No Are the antennas damaged Is the coaxial cable
9. Remote controller model NOTE Test conditions are based on ISO 5151 Cooling Indoor Dry bulb temperature 27 C Wet bulb temperature 19 Outdoor Dry bulb temperature 35 C Heating Indoor Dry bulb temperature 20 C Outdoor Dry bulb temperature 7 C Wet bulb temperature 6 C x1 Measured under rated operating frequency Electrical 6 9 Current 1 LL S pecial remarks Sound level Fan speed Specifications and rating conditions of main electric parts Fuse T3 15AL250V Horizontal vane motor 12 VDC Vertical vane motor 12 VDC i see SENSOR MOTOR 12 VDC Varistor S10K300E2K1 Terminal block 3P OBH623 i 4 NOISE CRITERIA CURVE MSZ FH25VE MSZ FH35VE FAN SPEED FUNCTION SPL dB A LINE 7 COOLING Super High 42 HEATING 44 90 80 70 60 50 40 30 20 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR HNC 10 Test conditions 63 125 250 500 1000 2000 4000 BAND CENTER FREQUENCIES Hz Cooling Dry bulb temperature 27 C Wet bulb temperature
10. on To release OFF timer press OFF TIMER button ec TIMER is cancelled and the display of set time disappears PROGRAM TIMER OFF timer and ON timer can be used in combination The timer of the set time that is reached first will operate first 4 and display shows the order of OFF timer and ON timer operation Example 1 The current time is 8 00 PM Example 2 The current time is 11 00 AM The unit turns off at 11 00 PM and on at 6 00 AM The unit turns on at 5 00 PM and off at 9 00 PM Current Current ON ON ON OFF zem RE OFF OFF 500 0300 manna enn i teehee PLIL OO OQ 6 NOTE If the main power is turned OFF or a power failure occurs while ON OFF timer is active the timer setting is can celled As these models are equipped with an auto restart function the air conditioner starts operating with timer cancelled when power is restored OBH623 9 8 WEEKLY TIMER OPERATION maximum of 4 ON or OFF timers can be set for individual days of the week A maximum of 28 ON or OFF timers can be set for a week E g Runs at 24 C from waking up to leaving home and runs at 27 C from getting home to going to bed on weekdays Runs at 27 C from waking up late to going bed early on weekends Mon Setting1 Setting2 Setting3 Setting4 24 27 Fri 6 00 8 30 17 30 22 00 Setting1 Setting2 S
11. replace the batteries to operate the remote controller normally Remove the front lid and insert batteries Press RESET button with a thin instrument and Then reattach the front lid then use the remote controller Insert the negative pole of the batteries first Check if the polarity A of the batteries is correct RESET button NOTE 1 If RESET button is not pressed the remote controller may not operate correctly 2 This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the battery replacement 3 Do not use the leaking batteries OBH623 10 2 FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once Even though LED indication listed on the troubleshooting check table 10 4 disappears the memorized failure details can be recalled 1 Flow chart of failure mode recall function for the indoor outdoor unit Operational procedure The cause of abnormality cannot be found because the abnormality does not recur Setting up the failure mode recall function Turn ON the power supply lt P reparation of the remote controller While pressing both OPERATION SELECT button and TEMP button on the remote controller at the same time press RESET button
12. x1 1 Regardless of normal or abnormal condition a short beep is emitted as the signal is received Y Does POWER lamp on the indoor No unit blink at the interval of 0 5 seconds OFF Blinks The air purifying device is abnormal Beep is emitted at the same timing as the blinking of POWER lamp x 2 Yes Blinks The air purifying device is abnormal Check the blinking pattern and refer to confirm the abnormal point with the AIR PURIFYING power failure mode table The air purifying device is normal 10 2 5 Make sure to check at least two consecutive blinking cycles x2 Releasing the failure mode recall function Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Release the failure mode recall function according to the left Press RESET button of the remote controller mentioned procedure 1 Repair the defective parts Deleting the memorized abnormal condition After repairing the unit recall the failure mode again according to Setting up the failure mode recall function mentioned above Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted Release the failure
13. AUTO operation from OFF e f the room temperature is higher than the set temperature operation starts in COOL mode If the room temperature is equal to or lower than the set temperature operation starts in HEAT mode 2 Mode change COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 1 C below the set temperature HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 1 C above the set temperature NOTE 1 If two or more indoor units are operating in multi system there might be a case that the indoor unit which is operating in ici AUTO cannot change over to the other operating mode COOL HEAT and becomes a state of standby Refer to NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER OBH623 i NOTE 2 FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT MXZ series Multi system air conditioner can connect two or more indoor units with one outdoor unit When you try to operate two or more indoor units with one outdoor unit simultaneously one for the cooling and the others for heating the operation mode of the indoor unit that operates first is selected Other indoor units cannot operate and operation indicator lamp flashes as shown in the figure below In this case please set all the indoor units to the same operation mode OPERATION INDICATOR Lighted Or Blinking O Notlighted When indoor unit starts the operation while the defrosting of outdoor unit
14. in the following order 1 2 3 4 EDIT SENO 3 Press button to complete the pairing setting After you turn the breaker ON the remote controller that first sends a signal to an indoor unit will be regarded as the remote controller for the indoor unit Once they are set the indoor unit will only receive the signal from the assigned remote controller afterwards SETTING THE INSTALLATION POSITION Be sure to set the remote controller according to the installed position of the indoor unit Installation position Left Center Right Left X Distance to objects wall cabinet etc is less than 50 cm to the left Center Distance to objects wall cabinet etc is more than 50 cm to the left and right Right Distance to objects wall cabinet etc is less than 50 cm to the right The installation position can be set only when all the following conditions are met The remote controller is powered OFF Weekly timer is not set Weekly timer is not being edited WIDE VANE 1 Hold down button on the remote controller for 2 seconds to enter the position setting mode WIDE VANE WIDE VANE 2 Select the target installation position by pressing button Each press of the button displays the positions in order center right left EDIT SEND Su 3 Press button to complete the position setting Installation position
15. may not be able to operate with it if the inverter fluorescent light is turned on when the room is warm the unit may be able to operate with the remote controller gt Cie the unit operate with No the remote controller Turn ON a radio to AM and press OPERATE STOP ON OFF button on remote controller x1 Yes Y Y Is noise heard from radio Yes Y Are there any fluorescent lights of inverter or rapid start type within the range of lm x2 No Replace the remote controller Reinstall the unit away from lights Yes Attach a filter on receiving part when the remote controller Measure the voltage between receiver P C board connector CN301 No 1 and No 3 button is pressed Is the voltage approximately 4 VDC 5 VDC No Replace the receiver P C board 27 Yes Replace the indoor electronic control P C board Check of indoor P C board and indoor fan motor Turn OFF the power supply Remove indoor fan motor connector CN211 from indoor power P C board and vane Measure the resistance of indoor fan motor connector CN151 from the indoor r motor electronic control board and turn ON Refer to 10 5 Replace the indoor fan motor the power supply Short circuit Does the unit operate with the remote
16. mode recall function according to Releasing the failure mode recall function mentioned above Note1 Make sure to release the failure mode recall function once it is set up otherwise the unit cannot operate proper 2 If the abnormal condition is not deleted from the memory the last abnormal condition is kept memorized 2 Blinking pattern when the air purifying device is abnormal Blinking at 0 5 Blinking at 0 5 2 5 second OFF second interval 2 5 second OFF second interval lt 4 gt lt 4 o1 nr rm OFF e ex ex gt Beeps i Beeps i Beeps Repeated cycle Repeated cycle 8 Repeated cycle 3 AIR PURIFYING power operation check AIR PURIFYING power goes ON when PURIFIER button on the remote contoller is pressed with any set temperature displayed during failure mode recall function Check the operation display section of the remote controller to confirm that AIR PURIFYING power is activated While AIR PURIFYING lamp stays OFF it means normal Flashing AIR PURIFYING lamp means abnormal the AIR PURIFYING power is not conducted AIR PURIFYING lamp Continuously blinking Follow Check of AIR PURIFYING power to identify the error Refer to 10 6 AIR PURIFYING power control circuit on the indoor electronic control P C board is out of order 2 time flash Refer to 10 6 NOTE Perform the above mentioned check with the front panel closed The interlock switch Air p
17. 111 Interlock switch CN1R 1 Air purifying device CN1T1 y bo CN110 pin Resistance kQ es G 2 0 10 20 30 40 50 60 RER OB Temperature C i x Lot Ra Receiver board FOL To E CN301 B6 mm s Je ee FA d Connector to indoor 5 Bii E 6 udi E power P C board E RA Le Te TT a aS sf coo A REGI ig S DMOON649 1 NCN301 Sipas a 5 B see SENSOR p er B s NP FEET MOTOR MT EE 1 see SENSOR L p u N h g z T Vane motor MV1 G pin O ah R Jolnts horizontal eee B9 Joints Vane motor MV2 D amp pin Indoor coil thermistor vertical 000 RT12 RT13 CN112 NOT eS GND Timer short mode
18. 19 C Heating Dry bulb temperature 20 C OBH623 INDOOR UNIT im 0 8m MICROPHONE WALL 5 OUTLINES AND DIMENSIONS MSZ FH25VE MSZ FH35VE Unit mm 11 20 Oblon 102 5 225 225 hole 925 905 235 257 lI I I I ee I Drain hose 234 5 51 60 18 MSZ FH25VE MSZ FH35VE 037 O D 26 35 0 39 m Flared connection 26 35 29 52 0 34 m Flared connection 29 52 Insulation 228 O D Connected part 216 O D Insulation Liquid line Gas line Drain hose OBH623 6 WIRING DIAGRAM MSZ FH25VE MSZ FH35VE SYMBOL NAME Fil FUSE TO OUTDOOR T3 15AL250V UNIT ME FAN MOTOR VANE MOTOR HORIZONTAL VANE MOTOR VERTICAL MT i see SENSOR MOTOR VARISTOR R111 RESISTOR N INTERLOCK Dor Ns 3 ITCH ONT L J RTII THERMISTOR jl COIL TEMP RTI THERMISTOR MAIN COIL TEMP RT13 THERMISTOR SUB T111 TRANSFORMER RECEIVER P G BOARD P C BOARD TB TERMINAL BLOCK INDOOR ELECTRONIC CONTROL P C BOARD 1 RELAY 7 REFRIGERANT SYSTEM DIAGRAM MSZ FH25VE MSZ FH35V
19. Changes for the Better MITSUBISHI ELECTRIC SPLIT TYPE AIR CONDITIONERS INDOOR UNIT SERVICE MANUAL No OBH623 Models MSZ FH25VE MSZ FH35VE Outdoor unit service manual MUZ FH VEHZ Series OBH625 MUZ FH VE Series MXZ D VA Series CONTENTS 1 TECHNICAL CHANGES 3 2 PART NAMES AND 4 2 SPECIFICATION 5 4 NOISE CRITERIA CURVE 6 5 OUTLINES AND DIMENSIONS 7 6 WIRING DIAGRANI 8 7 REFRIGERANT SYSTEM DIAGRAN 8 8 SERVICE FUNCTIONS 9 9 MICROPROCESSOR CONTROL 11 ES 10 TROUBLESHOOTING 19 11 DISASSEMBLY INSTRUCTIONS 34 PARTS CATALOG OBB623 NOTE RoHS compliant products have lt G gt mark on the spec name plate C C Use the specified refrigerant only Never use any refrigerant other than that specified f Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products We will not be held responsible for mechanical failure system malfunction unit breakdown or accidents caused by failure t
20. E Unit mm Refrigerant pipe 29 52 with heat insulator Flared connection Indoor coil thermistor RT12 main Indoor coil thermistor RT13 sub Room temperature thermistor RT11 Flared connection Refrigerant pipe 6 35 with heat insulator Refrigerant flow in cooling gt Refrigerant flow in heating OBH623 i 8 SERVICE FUNCTIONS MSZ FH25VE MSZ FH35VE 8 1 8 2 TIMER SHORT MODE For service the following set time can be shortened by short circuit of J PG and J PS on the electronic control P C board Refer to 10 7 Set time 3 minutes 3 seconds It takes 3 minutes for the compressor to start operation However the starting time is shortened by short circuit of J PG and J PS HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT A maximum of 4 indoor units with wireless remote controllers can be used in a room To operate the indoor units individually with each remote controller assign a number to each remote controller according to the number of the indoor unit This setting can be set only when all the following conditions are met The remote controller is powered OFF Weekly timer is not set Weekly timer is not being edited 1 Hold down button on the remote controller for 2 seconds to enter the pairing mode 2 Press button again and assign a number to each remote controller Each press of 1 4 button advances the number
21. ENSOR ASSEMBLY Catch of the DISPLAY AND T i see SENSOR ASSEMBLY B Receiver board m x C board OPERATING PROCEDURE PHOTOS 4 Removing the nozzle assembly 1 Remove the panels Refer to 1 and the corner box right 2 Remove the indoor outdoor connecting wire Refer to 2 3 Remove the electrical cover Refer to 2 4 Disconnect the following connector indoor electronic control P C board CN151 Vane motor 5 Remove the DISPLAY AND i see SENSOR ASSEMBLY 6 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 7 Remove the vane motors Refer to 5 6 5 Removing the vertical vane motor 1 Remove the nozzle assembly Refer to 4 2 Remove the screw of the vertical vane motor unit and pull out the vertical vane motor unit 3 Remove the screws of the vertical vane motor unit Cover 4 Disconnect the connector from the vertical vane motor 5 Remove the vertical vane motor from the vertical motor unit cover 6 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to 4 2 Remove the screws of the horizontal vane motor unit and pull out the horizontal vane motor unit 3 Remove the screws of the horizontal vane motor 4 Disconnect the connector from the horizontal vane motor 5 Remove the horizontal vane motor from the horizontal vane motor unit OBH623 36 Photo 7
22. IMER ONO a set buttons RESET button TIME TEMP DELETE aA bd CLOCK button SENSOR CLOCK RE Lid Slide the lid down to open the remote controller Slide it down further to get to the weekly timer buttons Temperature buttons ON OFF button SENSOR i see button Indication of remote controller model is on back NOTE Last setting will be stored after the unit is turned OFF with the remote controller Indoor unit receive the signal of the remote controller with beeps INDOOR UNIT DISPLAY SECTION Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state eThe following indication applies regardless of shape of the indication Indication Operation state Room temperature 3 Lighted Standby mode Blinking xx Only during multi system aeration 2 j O Notlighted 9 1 COOL amp OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select COOL mode with OPERATION SELECT button 3 Press TEMPERATURE buttons TEMP or button to select the desired temperature The setting range is 16 31 C 1 Coil frost prevention The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil from frosting When the temperature of indoor heat exchan
23. Left Center Right Remote controller gt display o c OBH623 8 4 AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller the operation mode the set temperature and the fan speed are memorized by the indoor electronic control P C board AUTO RESTART FUNCTION automatically starts operation in the same mode just before the shutoff of the main power Operation If the main power has been cut the operation settings remain After the power is restored the unit restarts automatically according to the memory However it takes at least 3 minutes for the compressor to start running How to disable AUTO RESTART FUNCTION Turn off the main power for the unit Cut the jumper wire to J R77 on the indoor electronic control P C board Refer to 10 7 Indoor electronic control P C board JR77 NOTE The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote controller If main power is turned OFF or a power failure occurs while AUTO START STOP timer is active the timer setting is can celled f the unit has been off with the remote controller before power failure the auto restart function does not work as the power button of the remote controller is OFF To prevent breaker OFF due to the rush of starting current systematize other home applia
24. NG CHECK TABLE 10 4 5 AIR PURIFYING power failure mode table POWER lamp 1 time flash Abnormal point Failure mode AIR PURIFYING power control Condition When AIR PURIFYING power cannot be turned OFF even if the AIR PURIFYING operation is turned OFF with the remote controller 2 time flash Electrode Spark discharge When the voltage between CN1T1 GND on the electronic P C board falls below 1 3V spark discharge judgment voltage 3 time flash Electrode Abnormal electric discharge error 1 When the voltage between CN1T1 and GND on the electronic P C board falls by 1 2V below the normal voltage value 2 5V Refer to 10 6 Check of AIR PURIFYING power 4 time flash Electrode Abnormal electric discharge error 2 When the voltage between CN1T1 and on the electronic P C board falls significantly 0 4V 0 5ms 5 time flash AIR PURIFYING power When the voltage between CN1T1 and GND on the electronic P C board rises above 3V NOTE1 Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE 10 4 NOTE2 As soon as an abnormality is detected AIR PURIFYING power goes OFF therefore measuring instrument which records the voltage wave is required in order to perform the above mentioned voltage measurement Operation check on i see SENSOR While recalling the failure details set t
25. OFF button on the remote controller for power ON and check for the electromagnetic noise 3 After a short time 3 minutes later after turning ON the outdoor unit starts running During operation check for the electromagnetic noise 4 Press OPERATE STOP ON OFF button on the remote controller for power OFF when the outdoor unit stops but the indoor outdoor communication still runs on In this situation check for the electromagnetic noise OBH623 Z 10 7 TEST POINT DIAGRAM AND VOLTAGE Indoor power P C board Indoor electronic control P C board Receiver board Display board Switch board MSZ FH25VE MSZ FH35VE Indoor power P C board Connector Terminal Fuse F11 Varistor NR 11 Indoor fan motor Block CN201 CN211 amp 40 or 15 VDC 43 6 VDC 15 VDC 9 GND high voltage DC D 325 VDC Resistor R111 5 VDC GND Connector to indoor 12 VDC electronic control P C board CN202 Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Indoor electronic control P C board Room temperature thermistor RT11 CN
26. OL z MODE In the i see control mode the room temperature is controlled based on the sensible temperature 1 Press SENSOR button with a thin instrument during COOL DRY HEAT and AUTO mode to activate i see control mode S The default setting is active 2 Press SENSOR button again to activate ABSENCE DETECTION ft 3 Press SENSOR button again to release i see control mode ABSENCE DETECTION ft This function automatically changes the operation to energy saving operation when nobody is in the room 1 To activate this function press SENSOR button until ft appears on the operation display of the remote controller during the i see control mode 2 Press SENSOR button again to release ABSENCE DETECTION 9 10 INDIRECT DIRECT mode The INDIRECT DIRECT mode offers finely tuned operation by locating where an occupant is in the room 1 Press INDIRECT DIRECT button during COOL DRY HEAT or AUTO mode to activate INDIRECT DIRECT mode This mode is only available when the i see control mode is effective 2 Each press of INDIRECT DIRECT button changes INDIRECT DIRECT in the following order ae m om a INDIRECT DIRECT OFF u E INDIRECT An occupant will be less exposed to direct airflow CJ Ma a DIRECT Mainly the vicinity of an occupant will be air conditioned NOTE Horizontal and vertical airflow directions will be automatically selected If you still feel uncomfortable with the air direction determine
27. STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select HEAT mode with OPERATION SELECT button 3 Press TEMPERATURE buttons TEMP or button to select the desired temperature The setting range is 16 31 C 1 Cold air prevention control When the compressor is not operating or is starting and the temperature of indoor heat exchanger and or the room tem perature is low or when defrosting is being done the indoor fan will stop or rotate in Very Low speed 2 High pressure protection The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the con densing pressure from increasing excessively When the temperature of indoor heat exchanger becomes too high the high pressure protection works The indoor fan operates following the cold air prevention control This mode continues until the temperature of indoor heat exchanger falls 3 Defrosting Defrosting starts when the temperature of outdoor heat exchanger becomes too low The compressor stops once the indoor outdoor fans stop the 4 way valve reverses and the compressor re starts This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes 9 5 AUTO CHANGE OVER AUTO MODE OPERATION Once desired temperature is set unit operation is switched automatically between COOL and HEAT operation Mode selection 1 Initial mode When unit starts the operation with
28. at ON OFF 27 C Sun 8 00 21 00 NOTE The simple ON OFF timer setting is available while the weekly timer is on In this case the ON OFF timer has priority over the weekly timer the weekly timer operation will start again after the simple ON OFF timer is complete 1 How to set the weekly timer Make sure that the current time and day are set correctly 1 Press button to enter the weekly timer setting mode blinks SET 1 TMMco cre 2 Press and buttons to select setting day and number E g Mon Tue Sun and 1 are selected 135010 Mon Tue Wed Thu Fri Sat Sun SET 1 1 Pressing selects the day of Pressing selects the week to be set the setting number ree gt Sat C 17273 4 Mon Tue Wed Thu Fri Sat Sun All days can be selected 3 Press rive and r ve buttons to set ON OFF time and temperature Es Mon Tue Wed Thu Fri Sat Sun E g ON 6 00 SET and 24 C are 2208 elc selected Pressing selects ON OFF timer A OON gt OFF Pressing TIME Pressing TEMP adjusts the time adjusts the tem Pressing perature deletes timer setting Hold down the button to change the time quickly Press and buttons to continue setting the timer for other days and or numbers 4 Press button to complete and transmit the weekly timer setting
29. ation Does the indoor POWER lamp No blink continuously 6 minutes after Repair completed the emergency operation starts ye A Does DC 20V or more occur R y m between indoor terminal block 5 2 No Replace the outdoor inverter P C board X1 controles lighting and 53 Turn OFF the power supply and then Yes tum ON again Press EMERGENCY OPERATION Replace the indoor electronic switch control P C board Reinstall eitherthe unit orthe light away from Is serial signal each other error indicated 6 Attach a filter minutes later on remote control receiv ing section ofthe indoor unit 29 OBH623 MXZ Type OFF the power supply 2 Is there rated voltage in the power supply y Yes Turn ON the power supply No Check the power supply Y Is there rated voltage between outdoor terminal block S1 and S2 No Check the wiring yes Press EMERGENCY OPERATION switch once y lt Confirmation of the power to the indoor unit gt the indoor POWER lamp light up Yes y Is serial signal error indicated 6 minutes later Yes No i Is there any miswiring poor contact or wire No disconnection ofthe Yes Correctthem indoor outdoor connect ing wire No lt Y A Y X1 Miswiring may damage indoor electronic control P C board during the ope
30. cal vane swings horizontally The remote controller displays ame Swing mode is cancelled when WIDE MODE CONTROL button is pressed once again OBH623 9 7 TIMER OPERATION 1 How to set the time 1 Check that the current time is set correctly NOTE Timer operation will not work without setting the current time Initially 0 00 blinks at the current time display of TIME MONITOR so set the current time correctly with CLOCK button How to set the current time a Press the CLOCK button b Press the TIME SET buttons CA and Cv to set the current time Each time FORWARD button CZ is pressed the set time increases by 1 minute and each time BACKWARD button C is pressed the set time decreases by 1 minute Pressing those buttons longer the set time increases decreases by 10 minutes c Press the CLOCK set button 2 Press OPERATE STOP ON OFF button to start the air conditioner 3 Set the time of timer ON timer setting a Press ON TIMER button eoN during operation b Set the time of the timer using TIME SET buttons C and Cv x OFF timer setting a Press OFF TIMER button during operation b Set the time of the timer using TIME SET buttons CZ and Cv x x Each time FORWARD button CA is pressed the set time increases by 10 minutes each time BACKWARD but ton Cv is pressed the set time decreases by 10 minutes 2 To release the timer To release ON timer press ON TIMER button
31. cator lamp continues to flash as shown in No 1 after the pro cedure refer to 10 6 How to check miswiring and serial error OBH623 i OPERATION INDICATOR Lighted i qx Blinking POWER AIR PURIFYING Notlighted Operation indicator lamp Symptom Condition AIR PURIFYING lamp flash The operation mode of the each indoor unit is operates but differently setto COOL includes DRY FAN A and HEAT at the same time the operation indoor unit does A I mode of the indoor unit that has operated at not operate bu first has the priority MXZ type Operation mode setting Outdoor unit o00000 8000008 e Unify the operation mode Refer to outdoor unit service 2 5 second OFF J manual POWER lamp is lighted OPERATION INDICATOR Lighted Q it xx Blinking POWER AIR PURIFYING Notlighted oa Operation indicator lamp Symptom Condition AIR PURIFYING lamp flashes AIR wosooooosos o s me PURIFYING 2 5 second OFF power control Indoor unit and outdoor unit do not operate When AIR PURIFYING power cannot be turned OFF even if the AIR PURIFYING operation is turned OFF by remote controller Refer to 10 6 Check of AIR PURIFYING power 10 5 TROUBLE CRITERION OF MAIN PARTS MSZ FH25VE MSZ FH35VE Part name Check method and criterion Room temperature thermistor RT11 Indoor coil thermistor RT12 RT13 Measur
32. d OPERATION INDICATOR lamp will light T x UE 1 i i i i i operation mode IS indicate y the Operation The first 30 minutes of operation is the test run operation This opera Indicator lamp as following tion is for servicing The indoor fan runs at High speed and the tem perature control does not work Operation Indicator lamp After 30 minutes of test run operation the system shifts to EMERGENCY COOL O EMERGENCY COOL HEAT MODE with a set temperature of 24 C The fan speed shifts to Med EMERGENCY HEAT Lighted The coil frost prevention works even in the test run or the emergency O Notlighted operation 5 In the test run or emergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receive any signal from the remote controller In case of latter normal operation will start NOTE Do not press EMERGENCY OPERATION switch during nor mal operation I Emergency operation switch SW 9 15 3 MINUTE TIME DELAY OPERATION When the system turns OFF compressor will not restart for 3 minutes as 3 minute time delay function operates to protect compressor from overload OBH623 10 TROUBLESHOOTING MSZ FH25VE MSZ FH35VE 10 1 CAUTIONS ON TROUBLESHOOTING 1 Before troubleshooting check the following 1 Check t
33. d by the INDIRECT mode adjust the air direction manually Cancelling the i see control mode automatically cancels the INDIRECT DIRECT mode INDIRECT DIRECT mode is also cancelled when the VANE or WIDE VANE buttons is pressed Do nottouch the i see SENSOR This may cause malfunction ofthe i see SENSOR 9 11 NATURAL FLOW 34 OPERATION In NATURAL FLOW operation air flow will become more like natural wind An occupant will not be directly exposed to the air flow and feel more comfortable 1 Press NATURAL FLOW button during COOL or FAN mode to start NATURAL FLOW operation 2 Press NATURAL FLOW button again to cancel NATURAL FLOW operation NATURAL FLOW operation is also cancelled when the POWERFUL or ECONO COOL button is pressed NOTE As the fan speed changes constantly during NATURAL FLOW operation the sound of air flow wind velocity and air flow temperature also change This is not a malfunction OBH623 9 12 AIR PURIFYING OPERATION In the AIR PURIFYING operation the indoor unit built in device reduces airborne fungi viruses mold and allergens 1 Press PURIFIER button to start AIR PURIFYING operation AIR PURIFYING lamp turns on Display section 2 Press PURIFIER button again to cancel AIR PURIFYING operation AIR PURIFYING lamp turns off Display section NOTE Never touch the air purifying device during operation Although the air purifying device is safety conscious design touching this
34. d from the memory the last abnormal condition is kept memorized x4 The information regarding whether the connected X2 Blinking pattern when the indoor unit is abnormal outdoor unit is a low standby power model or a non Eel ee pa Sinking at 1 low standby power model will also be initialized 24 588008 OFE second Interval _fo second second interval Default compatible with a low standby power model gg gE SS py OFF lt gt lt lt lt P Beeps gt a Beeps t Repeated cycle t Repeated cycle Repeated cycle 3X3 Blinking pattern when the outdoor unit is abnormal ans Blinking at 0 5 Blinking at 0 5 i second interval 25 OFF a 3 second ON T second interval gt second OFF a 3 second ON gt s HE A pO p L C OFF gt o 7 lt gt gt lt gt 7 lt gt m No beep Beeps i No beep i Beeps gt a Repeated cycle Repeated cycle Repeated cycle OBH623 2 Flow chart of AIR PURIFYING power failure mode recall function Operational procedure The air purifying device might be abnormal Confirm if the air purifying device is abnormal according to the following procedures Y Confirm that the remote controller is in the failure mode recall function v With the remote controller headed towards the indoor unit press TOO COOL or TOO WARM button to adjust the set temperature to 23 C
35. d in 10 2 1 OBH623 i 2 PART NAMES AND FUNCTIONS MSZ FH25VE MSZ FH35VE Front panel Emergency operation Air filter Air cleaning filter Electrostatic anti allergy enzyme filter and deodorizing filter Remote controller AIR PURIFYING POWER Remote control receiving section Operation indicator lamp ACCESSORIES Model MSZ FH25VE MSZ FH35VE Installation plate Installation plate fixing screw 4 x 25 mm Remote controller holder Fixing screw for 3 5 x 16 mm Black Battery AAA for remote controller Wireless remote controller Felt tape For left or left rear piping Air cleaning filter Electrostatic anti allergy enzyme filter Air cleaning filter Deodorizing filter Air purifying device Pile e mB inm mnimimj u n OBH623 3 SPECIFICATION Indoor model MSZ FH25VE MSZ FH35VE Power supp Single phase 230 V 50 Hz Power input Cooli 29 1 Heati 29 Running Cooli 0 28 current 1 Heati 0 28 Model RC0J 30 MD Cooli 0 28 Heati 0 28 Dimensions W xH xD 925 x 305 17 x 234 Weight 13 5 Air direction 5 Super High 696 High 516 Med 378 Low 282 ilent 234 uper High 792 igh 552 ed 384 Low 282 ilent 240 uper High 42 igh 36 ed 29 Low ilent uper High igh ed Low ilent uper High igh ed Low ilent uper High igh ed Low Silent Fan speed regulator
36. damaged Replace or repair the antenna Is there any poor contact in the anten yes Replace or repair the coaxial cable na wiring E Is the indoor outdoor connecting wire Extend the distance between the indoor outdoor of the air conditioner and the wiring of connecting wire of the air conditioner and the wir the antennas close Yes ing of the antennas Even if all of the above conditions are fulfilled the electromagnetic noise may enter depending on the electric field strength or the installation condition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave Channel frequency broadcast station affected by the electromagnetic noise Channel frequency broadcast station unaffected by the electromagnetic noise Layout of indoor outdoor unit of the air conditioner indoor outdoor wiring earth wire antennas wiring from antennas receiver Electric field intensity of the broadcast station affected by the electromagnetic noise Presence or absence of amplifier such as booster Operation condition of air conditioner when the electromagnetic noise enters in 1 Turn OFF the power supply once and then turn ON the power supply In this situation check for the electromagnetic noise 2 Within 3 minutes after turning ON the power supply press OPERATE STOP ON
37. device could be the cause of trouble as this device discharge high voltage electricity A hissing sound may be heard during the air purifying operation This sound is produced when plasma is being discharged This is not a malfunction AIR PURIFYING lamp does not turn on if the front panel is not closed completely 9 13 i save OPERATION 1 How to set i save operation 1 Press OPERATE STOP ON OFF button 2 Select COOL HEAT or ECONO COOL mode 3 Press i save button 4 Set the temperature fan speed and airflow direction for i save operation NOTE i save operation cannot be selected during DRY or AUTO mode operation The setting range of HEAT mode i save operation is 10 C and 16 31 C 2 groups of setting can be saved One for COOL ECONO COOL one for HEAT 2 How to cancel operation Press i save button again e i save operation can also be cancelled by pressing POWERFUL button or OPERATION SELECT button to change the operation mode The same setting is select from the next time by simply pressing i save button 9 14 EMERGENCY TEST OPERATION In case of test run operation or emergency operation use f Operation mode COOL HEAT EMERGENCY OPERATION switch on the right side of the indoor unit Set temperature 24 C Emergency operation is available when the remote controller is miss Fan speed Med ing has failed or the batteries of the remote controller run down The Honzontal vane Auto unit will start an
38. e the resistance with a tester Refer to 10 7 Test point diagram and voltage Indoor electronic control P C board for the chart of thermistor Indoor fan motor MF Check 10 6 Check of indoor fan motor Vane motor MV1 HORIZONTAL Measure the resistance between the terminals with a tester Temperature 10 30 C Color of the lead wire RED SKY Normal 262 328 Q Vane motor MV2 VERTICAL Measure the resistance between the terminals with a tester Temperature 10 30 C Color of the lead wire RED SKY Normal 219 2730 SENSOR MOTOR MT Measure the resistance between the terminals with a tester Temperature 10 30 C Color of the lead wire RED BLK Normal 262 328 Q BLK BLK AIR PURIFYING power OBH623 Check 10 6 25 10 6 TROUBLESHOOTING FLOW A Check of indoor fan motor The indoor fan motor error has occurred and the indoor fan does not operate C Turn OFF the power supply Pay enough attention to the high voltage on the fan motor connector CN211 Turn ON the power supply wait 5 seconds or more and then press EMERGENCY OPERATION switch Measure the supply voltage as follows within 12 seconds after EMER GENCY OPERATION switch is pressed If more than 12 seconds passes turn OFF the power supply and turn it Is there any foreign matter that interferes the ro
39. er to outdoor unit service 2 5 second OFF manual POWER lamp flashes 7 time flash Replace the inverter P C board Outdoor It cannot properly read data in the nonvolatile or the outdoor electronic control w DOES ery controlsys eoeoceoeoeososooooot memory of the inverter P C board or the out P C board tem VIR em ERN door electronic control P C board Refer to outdoor unit service 2 5 second OFF manual POWER lamp flashes 14 time flash Check the stop valve Otherab w An abnormality other than above mentioned Confirm the abnormality in normality is detected detail using the failure mode recall function for outdoor unit pes ee 2 5 second OFF Outdoor Outdoor unit It cannot properly read data in the nonvolatile IME inking patien of control sys POWER lamp lights up does not oper memory of the inverter P C board or the out board or the outdoor electronic control P C board tem ate door electronic control P C board NOTE The indoor unit may have been connected to a non low standby power model outdoor unit To use a low standby power model clear the error history by referring to Deleting the memorized abnormal condition described in 10 2 1 When the error history is being cleared the connection information also will be initialized The indoor unit will be compatible with a low standby power model after initialization If the operation indi
40. ft panel and remove the left panel 5 Unhook the lower part of the under panel and remove the under panel OBH623 Photo 1 Front panel Horizontal vanes Horizontal vanes Photo 2 Leftpanel Screws of the panels Right panel Under panel Screws of the under panel 34 OPERATING PROCEDURE PHOTOS 2 Remove the indoor electrical box 1 Remove the panels Refer to 1 and the corner box right 2 Remove the screw of the V A clamp Remove the V A clamp and the indoor outdoor connecting wire 3 Remove the earth wire connected to the indoor heat exchanger from the electrical box 4 Remove the screw of the electrical cover and remove the electrical cover 5 Disconnect following connectors indoor electronic control P C board CN151 Vane motor CN1T1 Air purifying device CN1R1 Interlock switch Air purifying device indoor power P C board CN211 Indoor fan motor 6 Remove the screw fixing the electrical box then the upper catch of the electrical box and pull out the electrical box When installing the electrical box pass the lead wire from the fan motor through Photo 9 and Photo 4 so that it will not be pinched under the electrical box Photo 4 Removing the indoor power P C board the switch board the display board the receiver board and the indoor electronic control P C board 1 Remove the panels Refer to 1 and the corner box right 2 Remo
41. ger becomes too low the coil frost prevention mode works The indoor fan operates at the set speed and the compressor stops This mode continues until the temperature of indoor heat exchanger rises 2 Low outside temperature operation When the outside temperature is lower low outside temperature operation starts and the outdoor fan slows or stops 3 Indoor fan speed control When the thermostat turns OFF the indoor fan operates very Low to reduce power consumption When the room temperature rises and the thermostat is ON the indoor fan operates according to the settings on the remote controller OBH623 9 2 DRY A OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select DRY mode with OPERATION SELECT button 3 The set temperature is determined from the initial room temperature 1 Coil frost prevention Coil frost prevention is as same as COOL mode 9 1 1 2 Low outside temperature operation Low outside temperature operation is as same as COOL mode 9 1 2 3 Indoor fan speed control Indoor fan speed control is as same as COOL mode 9 1 3 9 3 FAN 3 OPERATION 1 OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select FAN mode with OPERATION SELECT button 3 Select the desired fan speed When AUTO it becomes Low Only indoor fan operates Outdoor unit does not operate 9 4 HEAT 5 OPERATION 1 Press OPERATE
42. he power supply voltage 2 Check the indoor outdoor connecting wire for miswiring 2 Take care of the following during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with the remote controller and then after confirming the horizontal vane is closed turn OFF the breaker and or disconnect the power plug 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the top panel and the P C board 3 When removing the P C board hold the edge of the board with care NOT to apply stress on the components 4 When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires lt Incorrect gt lt Correct gt EAS Lead wiring Housing point 3 Troubleshooting procedure 1 First check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality To make sure check how many times the OPERATION INDICATOR lamp is flashing ON and OFF before starting serv ice work 2 Before servicing check that the connector and terminal are connected properly 3 When the electronic control P C board seems to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 4 When troubleshooting Refer to 10 2 10 3 and 10 4 4 How to replace batteries Weak batteries may cause the remote controller malfunction In this case
43. he temperature to 19 C or 19 5 C to perform the simple check on the i see SENSOR Place your hand over the i see SENSOR and the buzzer will beep at 1 second intervals Normal detection temperature range is 34 to 39 C If the buzzer does not beep check for disconnection of the connectors Set the temperature to 23 C to exit the simple check mode on the i see SENSOR POWER lamp Abnormal point Failure mode Condition Remedy 6 time flash i see SENSOR OBH623 Poor contact in i see SENSOR wiring Failure in loading corrected data of i see SENSOR 22 Check for disconnection of the connectors 10 3 INSTRUCTION OF TROUBLESHOOTING Test Run operation means the If blinking of OPERATION INDI Start operation within 30 minutes af CATOR lamp cannot be checked ter EMERGENCY OPERATION it can be checked with failure switch is pressed mode recall function Indoor unit does not receive the signal from re mote controller Indoor unit operates Outdoor unit does not operate normally Indoor unit oper ates Outdoor unit does not operate m ses POWER lamp on the indoor unit is flashing ON and OFF Outdoor unit Outdoor unit Unit does not Indoor unit Indoor unit does AIR PURIFYING operates only does not operate nor operates when not operate when lamp in Test Run operate even mal ope
44. is abnormal No The indoor unit is abnormal Y The outdoor unit is abnormal Check the blinking pattern and confirm the abnormal point with the indoor unit Check the blinking pattern and confirm the abnormal point with the failure mode table R efer to 10 2 2 outdoor unit failure mode table R efer to outdoor unit service manual Make sure to check at least two consecutive blinking cycles 3 Make sure to check at least two consecutive blinking cycles 3 Releasing the failure mode recall function Y Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller Y Repair the defective parts Deleting the memorized abnormal condition After repairing the unit recall the failure mode again according to Setting up the failure mode recall function mentioned above Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 3 Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted x4 Release the failure mode recall function according to Releasing the failure mode recall function mentioned above NOTE 1 Make sure to release the failure mode recall function once it is set up otherwise the unit cannot operate properly 2 If the abnormal condition is not delete
45. is being done it takes a few minutes max 10 minutes to blow out the warm air n the heating operation though indoor unit that does not operate may get warm or the sound of refrigerant flow ing may be heard they are not malfunction The reason is that the refrigerant continuously flows into it 9 6 AUTO VANE OPERATION 1 Horizontal vane 1 Vane motor drive These models are equipped with a stepping motors for the horizontal vanes The rotating direction speed and angle of the motor are controlled by pulse signals approximately 12 V transmitted from indoor microprocessor L VANE R 2 The horizontal vane angle and mode change as follows by pressing VANE CONTROL button AUTOQ 1 2 34 44 LM UE NOTE The right and left horizontal vanes set to the same level may not align perfectly 3 Positioning To confirm the standard position the vane move until it touches the vane stopper Then the vane is set to the select ed angle Confirming of standard position is performed in the following cases a When the operation starts or finishes including timer operation b When the test run starts c When standby mode only during multi system operation starts or finishes 4 VANE AUTO mode In VANE AUTO mode the microprocessor automatically determines the vane angle to make the optimum room tem perature distribution Sl 2 PUE e In COOL and DRY operation In HEAT operation Vane angle is fixed
46. istor 2 time flash e Refer to the characteristics of a ow dos The indoor coil or the room temperature ther indoor coil thermistor and the Room tem ROR ODIO ROR mistor is short or open circuit room temperature thermistor perature 2 5 second OFF 10 7 thermistor POWER lamp flashes 3 time flash Indoor fan 0 080000080808000 proce 2 5 second OFF The rotational frequency feedback signal is Referto 10 6 Check of in not emitted during the indoor fan operation door fan motor POWER lamp flashes 4 time flash TRE It cannot properly read data in the nonvolatile 000 memory of the indoor electronic control P C board Replace the indoor electronic control P C board Indoor con osososeooooososo y MASS E 2 5 second OFF Indoor unit and POWER lamp flashes 5 time flash e Refer to How to check of in Outdoor It consecutively occurs 3 times that the com verter compressor uox n rk ui ressor stops for overcurrent protection or 0o8080808 eos p CUTTS NC I Pint Sy FO ROROROR OOOO RO RO start up failure protection within 1 minute after Rererto outdoor unit service 2 5 second OFF start up Check the stop valve POWER lamp flashes 6 time flash Outdoor DO NC ONERE NS v thermistors 80 808 09 ogoseooooos o Referto Check of outdoor The outdoor thermistors short or open circuit thermistor during the compressor operation Ref
47. nce not to turn ON atthe same time When some air conditioners are connected to the same supply system if they are operated before power failure the starting current of all the compressors may flow simultaneously at restart Therefore the special counter measures are required to prevent the main voltage drop or the rush of the starting current by adding to the system that allows the units to start one by one 10 OBH623 9 MICROPROCESSOR CONTROL MSZ FH25VE MSZ FH35VE WIRELESS REMOTE CONTROLLER Signal transmitting section Distance of signal About 6 m Beep s is are heard from the indoor unit when the signal is received FAN SPEED CONTROL button TEMP ONOFF VIDE VANE OPERATION SELECT button v TI MODE COOL button ae WIDE VANE button g EYE VANE CONTROL button POWERFUL button ee Cay as VANE CONTROL button PURIFIER PURIFIER button INDIRECT DIRECT button TIME TIMER set buttons NATURAL FLOW TIMER FORWARD button 3e wanes a Operation display section T lope cS haa gt i save button OWERFUL INDIRECTIDIRECT WEEKLY i r RE Mon Tue Wet Thu Fri Sat Sun en JCLOCI 99 28 98520 98 F q isave Bn 3A OFF BACKWARD button WEEKLY TIMER EDIT SEND sET ace l4 L e BAY 1 4 WEEKLY T
48. ng the check make sure to release the failure mode recall function High voltage approximately 5 8kV is generated during Turn ON the power supply AIR PURIFYING power operation Pay careful attention and never touch the air purifying device and the high voltage lead part Y Does AIR PURIFYING lam Yes md 2 time with unit stopping Replace the indoor electronic control P C board No Make sure that the front panel is firmly closed While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button First release RESET button Hold down the other two buttons for another 3 seconds Confirm that the indicators on the LCD screen shown in the right figure are all displayed Then release the buttons Press OPERATE STOP ON OFF button the set temperature is displayed And press PURIFIER button once with the remote controller headed towards the indoor unit 1 AIR denm AIR PURIFYING operation is selected PURIFYING sos The AIR PURIFYING power operation check mode is set operation x1 Regardless of normal or abnormal condition uw TIER oon Tue Wed Thu Fr Sat Su a short beep is emitted once the signal CSETIQOHOON OOF is received 122489 08 80 50 88 Refer to 10 2 5 AIR PURIFYING power supply is normal Does AIR PURIFYING lamp stay OFF or OFF Wo
49. o follow the instructions lt Preparation before the repair service gt e Prepare the proper tools Prepare the proper protectors Provide adequate ventilation After stopping the operation of the air conditioner turn off the power supply breaker and remove the power plug Discharge the capacitor before the work involving the electric parts lt Precautions during the repair service gt e Do not perform the work involving the electric parts with wet hands Do not pour water into the electric parts Do not touch the refrigerant Do not touch the hot or cold areas in the refrigeration cycle When the repair or the inspection of the circuit needs to be done without turning off the power exercise great caution not to touch the live parts OBH623 i 1 TECHNICAL CHANGES MSZ FH25VE MSZ FH35VE 1 New model m These models are compatible with the outdoor units with low standby power control Connecting these models to MUZ FH VE HZ series outdoor units enables the low standby power control Refer to the technical guide OBT17 about the low standby power control These models may be connected to the MUZ FH VE HZ series after once connected to the MXZ series and operated for example because of relocation In that case the MUZ FH VE HZ series outdoor units will not operate without taking a step Follow the procedure Deleting the memorized abnormal condition describe
50. point Q ls JPG JPS Refer to 8 1 To disable Auto restart E Switch board function cut the J umper wire to J R77 Refer to 8 4 Emergency operation switch E O SW SW1 OBH623 is 11 DISASSEMBLY INSTRUCTIONS lt Terminal with locking mechanism Detaching points The terminal which has the locking mechanism can be detached as shown below There are two types Refer to 1 and 2 ofthe terminal with locking mechanism The terminal without locking mechanism can be detached by pulling it out Check the shape of the terminal before detaching 1 Slide the sleeve and check if there is a locking lever or not Slide the sleeve lever 11 1 MSZ FH25VE MSZ FH35VE OPERATING PROCEDURE GPull the terminal while pushing the locking 2 The terminal with this connector has the locking mechanism Hold the sleeve and pull out the terminal slowly Connector NOTE Turn OFF power supply before disassembly PHOTOS 1 Removing the panel 1 Remove the horizontal vanes Removal procedure Unlock the upper and lower vanes as shown in using a thin instrument Then remove the horizontal vanes in the direction of Upper and lower vanes 2 Remove the front panel Remove the screw caps of the under panel Remove the screws of the under panel 3 Pull out the right top corner of the right panel and remove the right panel 4 Pull out the left bottom corner of the le
51. ration Turn OFF the power supply Short circuit outdoor terminal block 52 and 53 1 B Check once more if the indoor outdoor connecting wire is not miswiring Remove the indoor outdoor connecting wire from outdoor terminal block S3 After 3 minutes LED blinks 6 times Even when the Be sure to confirm the wiring is correct before the opera tion starts X3 Be sure to check this within 3 minutes after turning ON inverter P C board or the outdoor electronic control P C board is normal LED blinks 6 times after 3 minutes Y Turn ON the power supply Y Except for outdoor unit of multi system type Referto TEST POINT DIAGRAM AND VOLTAGE of the outdoor unit Is the bus bar voltage of the inverter P C board or the outdoor electronic control P C board normal d Check of power supply Yes Y us the LED on the inverter P C board or the outdoor electronic control P C board repeat 3 6 second OFF and 0 8 second ON quick blinking X3 Replace the inverter P C board orthe outdoor electronic control P C board No Lighted Yes or not 2 Be careful of the residual voltage of smoothing lighted capacitor Turn OFF the power supply Remove the short circuit between outdoor terminal block S2 and S3 Turn ON the power supply Connectthe indoor outdoor connecting wire to outdoor terminal block S3
52. ration EMERGENCY EMERGENCY 2 time flash operation in Test Run in COOL or OPERATION OPERATION cause operation X HEAT mode Switch is pressed Switch is pressed indoor unit e Trouble of AIR PURIFYING power control Refer to 10 6 Check of AIR PURIFYING power 1 Check indoor out door connecting wire Check if the power is supplied to the indoor unit Refer to 10 6 Check of indoor P C board and indoor fan motor Refer to Check of R V coil Check room Refer to How to check inverter com pressor Refer to 10 6 Check of remote controller and indoor electronic control P C board temperature thermistor Refer to 10 7 Test point diagram and POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp P OWER lamp Flash 2 time flash 3 time flash 4 time flash 5 time flash 6 time flash 7 time flash 14 time flash offat0 5 sec Cause Cause Cause Cause Cause Cause Cause ond intervals Indoor unit Indoorunit Indoor unit Outdoor unit Outdoor unit Outdoor unit Outdoor unit Cause Trouble e Trouble of Trouble e Outdoor Trouble of Trouble of Otherab Indoor Outdoor of room indoorfan ofindoor power thermistor in outdoor con normality unit temperature motor unit control system outdoor unit
53. rking of the interlock switch Air purifying device continuously blink due to uncomplete close of the front panel could cause 2 time flash x 2 Turn AIR PURIFYING power OFF and ON again Continuously blinking For turning OFF AIR PURIFYING power refer to 10 2 3 If it goes normal without turning OFF and ON AIR PURIFYING lamp does not go OFF Abnormal discharge may occur due to much dirt on the Remove the air purifying device air purifying device clean it firmly close the front panel and then perform OFF After cleaning make sure to attach the air purifying device AIR PURIFYING power operation check x 2 since it is completely dry Does AIR PURIFYING lamp stay OFF or If AIR PURIFYING power operation check is performed with continuously blink the air purifying device wet protection gets active and AIR PURIFYING lamp blinks continuously as well Continuously blinking Turn OFF the power supply and check the No interlock switch Air purifying device Firmly fix the interlock switch Air purifying device Is it firmly fixed Yes Work and Not work the interlock switch Air purifying device using something No steer GN IPI Gand Dor the indoor elector Replace the interlock switch Air purifying device between CN1R1 and on the indoor electronic gt Replace the interlock switch Air purifying device control P C board Does the interlock switch Air purifying device function Yes
54. rol P C board when Yes Changed the fan motor is rotating Unchanged Replace the indoor fan motor Y i Replace the indoor Replace the indoor power P C lt Is it unchanged holding electronic control P C board Yes Oor5 VDC No board Changed Unchanged OBH623 Check of remote controller and indoor electronic control P C board x Check if the remote controller is exclusive for this air conditioner button on the remote controller y Is LCD display on the remote controller visible No Press OPERATE STOP Yes Remove the batteries then set them back and press RESET button Refer to 10 1 4 Check if the unit operates with the remote controller Does the unit operate with the remote controller No Yes OBH623 Replace the batteries Refer to 10 1 4 Not clear Assign a number of remote controller Refer to 8 2 Check if the unit operates with the remote controller Y x1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera It is normal if LED of the signal transmitting section lights up when the OPERATE STOP ON OFF button on the remote controller is pressed x 2 If the inverter fluorescent light is turned on when the room is cool the unit may have difficulty receiving the signal from the remote controller or
55. s one of the following buttons in ECONO COOL operation ECONO COOL VANE CONTROL POWERFUL or NATURAL FLOW button 10 POWERFUL operation The air conditioner automatically adjusts the fan speed and the set temperature and operates the POWERFUL mode The POWERFUL mode is cancelled automatically 15 minutes after operation starts or when POWERFUL button is pressed once again within 15 minutes after operation starts The operation mode returns to the mode prior to POWERFUL operation POWERFUL mode also is cancelled when the OPERATE STOP ON OFF ECONO COOL FAN SPEED CONTROL NATURAL FLOW or i save button is pressed within 15 minutes after operation starts or opera tion mode is changed 2 Vertical vane 1 Vane motor drive These models are equipped with a stepping motor for the vertical vane The rotating direction speed and angle of the motor are controlled by pulse signals approximately 12 V transmitted from microprocessor 2 The vertical vane angle and mode change as follows by pressing WIDE VANE CONTROL button 3 Positioning 1 2 2 2 3 4 w 5 ms SWING To confirm the standard position the vane moves until it touches the vane stopper Then the vane is set to the select ed angle Confirming of standard position is performed in the following cases a OPERATE STOP ON OFF button is pressed POWER ON 4 SWING zx MODE By selecting SWING mode with WIDE VANE CONTROL button the verti
56. t side of the heat exchanger 10 Lift the heat exchanger and pull out the line flow fan to the lower left Photo 12 Screws of the left side of the heat exchanger OBH623 37 Photo 9 Lead wire of the indoor coil thermistor Water cut Screws of the motor bed Photo 10 Air purifying device Screw of the air Screw of the upper right purifying device support side of the heat exchanger Photo 11 Screw of the line flow fan MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 J APAN Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Jul 2012 No OBH623 New publication effective J ul 2012 Made in Japan Specifications are subject to change without notice
57. tation of the line flow fan No ON again then measure the voltage Indoor power P C board 1 Measure the voltage between CN211 and G Yes 2 Measure the voltage between CN211 and indoor electronic control P C board 3 Measure the voltage between CN102 and J PG GND R the forei tt d sidste IS ow ns SAN X If more than 12 seconds passes after EMERGENCY OPERATION switch is pressed the voltage measured at 2 above goes 0 VDC although the indoor P C board is normal Does the voltage between CN211 Is there 325 VDC and on the power P C board between CN211 Yes rise to the range of 3 to 6 VDC within and 12 seconds afterEMERGENCY OPERATION switch is pressed Does the voltage between CN102 and J PG GND on the indoor Replace the indoor fan motor Replace the indoor power electronic control P C board fall to Replace the indoor electronic P C board Yes 2 V or less within 12 seconds after No control P C board EMERGENCY OPERATION switch is pressed The indoor fan motor error has occurred and the indoor fan repeats 12 second ON and 30 second OFF 3 times and then stops Measure the voltage CN102 Measure the voltage between CN211 N Is itunchanged holding and JPG GND on the indoor and while the f t gt Mix i ua 0 or 15 VDC No electronic cont
58. to Horizontal position Vane angle is fixed to Angle 4 Horizontal position 5 STOP operation OFF and ON TIMER standby In the following cases the horizontal vane returns to the closed position a When OPERATE STOP ON OFF button is pressed POWER OFF b When the operation is stopped by the emergency operation c When ON TIMER is ON standby 6 Dew prevention During COOL or DRY operation with the vane angle at Angle 4 or 5 when the compressor cumulative operation time exceeds 1 hour the vane angle automatically changes to Angle 3 for dew prevention OBH623 s 7 SWING mode By selecting SWING mode with VANE CONTROL button the horizontal vanes swing vertically When COOL DRY or FAN mode is selected only the upper vane swings 8 Cold air prevention in HEAT operation The horizontal vane position is set to Upward NOTE When 2 or more indoor units are operated with multi outdoor unit even if any indoor unit turns thermostat off this control does not work in the indoor unit 9 ECONO COOL tt operation ECONOmical operation When ECONO COOL button is pressed in COOL mode set temperature is automatically set 2 C higher Also the horizontal vane swings in various cycle SWING operation makes you feel cooler than set temperature So even though the set temperature is higher the air conditioner can keep comfort As a result energy can be saved To cancel this operation select a different mode or pres
59. upply and outdoor terminal block 51 and yes between the main power supply and outdoor Wait for 2 or more minutes after the main power supply is turned on ermine 52 Touch 52 and S3 with tester probes and start the emergency operation When the emergency operation starts does the rated voltage occur for 2 No seconds between indoor terminal block 52 and S3 Y yes Turn the main power supply OFF Does the indoor POWER lamp No No Y blink continuously 6 minutes after Does the outdoor LED light up Turn the main power supply the emergency operation starts ON Y Yes Y Yes Confirm that the thermostat is OFF Wait for 2 or more minutes after the main power sup and wiring is not loose ply is turned ON Touch CN202 and J PG with tester Y probes and start the emergency operation en outdoor LED blink 6 He Replace the outdoor inverter P C board x1 During the emergency operation does DC 2V or less occur for 2 No Nes seconds between CN202 and Does DC 6V or more occur ils s indoor electronic control between indoor terminal block 2 Replace the outdoor inverter P C board 1 board and S3 Y Yes Yes Y Replace the Replace the xl indoor power P C indoor electronic Turn the main power supply OFF Electric charge may remain immediately board control P C board Replace the indoor power P C after the main power supply is turned OFF board Perform the procedure after 3 minutes Turn the main power supply ON Start the emergency oper
60. urifying device works by opening front panel and the AIR PURIFYING power is cut OBH623 4 Indoor unit failure mode table POWER lamp Abnormal point Failure mode Condition Remedy Not lighted Normal 1 time flash every 0 5 second Room temperature thermistor The room temperature thermistor short or open circuit is detected every 8 seconds dur ing operation Refer to the characteristics of the room temperature thermistor 10 7 2 time flash 2 5 second OFF Indoor coil thermistor The indoor coil thermistor short or open circuit is detected every 8 seconds during operation Refer to the characteristics of the main indoor coil ther mistor the sub indoor coil thermistor 10 7 3 time flash 2 5 second OFF Serial signal The serial signal from outdoor unit is not re ceived for a maximum of 6 minutes Refer to 10 6 How to check miswiring and serial signal error 11 time flash 2 5 second OFF Indoor fan motor The rotational frequency feedback signal is not emitted during the 12 seconds the indoor fan operation Refer to 10 6 Check of indoor fan motor 12 time flash 2 5 second OFF Indoor control system It cannot properly read data in the nonvolatile memory of the indoor electronic control P C board Replace the indoor electronic control P C board NOTE Blinking patterns of this mode differ from the ones of TROUBLESHOOTI
61. ve the screw of the V A clamp Remove the V A clamp and the indoor outdoor connecting wire 3 Remove the indoor electrical box Refer to 2 4 Remove the earth wire connected to the electrical box from the indoor power P C board 5 Disconnect the following connectors indoor electronic power P C board CN201 Terminal block CN202 To the indoor electronic control P C board 6 Remove the lead wire holder 7 Remove the indoor power P C board 8 Disconnect the following connectors indoor electronic control P C board CN106 Switch P C board CN110 DISPLAY AND i see SENSOR ASSEMBLY CN111 Room temperature thermistor CN112 Indoor coil thermistor 9 Unhook the catches of the DISPLAY AND i see SENSOR ASSEMBLY from the electrical box right side 10 Unhook the catch of the rear cover of the DISPLAY AND i see SENSOR ASSEMBLY and open the rear cover Remove the display P C board and the receiver P C board 11 Open the switch panel and remove the switch P C board OBH623 Screw of Photo 5 Y P Photo 6 Display P 35 Earth wire Electrical box Screw of the electrical cover x Screw of the V A clamp DISPLAY AND i see 14 J SENSOR ASSEMBLY Earth wire Upper catch Lead wire holder Indoor power P C board Indoor electronic control P C board Screw of the electrical box Catch ofthe DISPLAY AND the terminal block i see S
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