9. Troubleshooting
Contents
1. All the indoor units appear communication malfunction De energize check if the connection wire of indoor and outdoor unit and the wire of the eletric box is connected correctly Reconnect according to Connected correctly No Eliminate the malfunction the wiring diagram Ves Yes q De energize check if the connection wire betwee the outdoor mainboard and the filter board according to the wiring diagram Reconnect according to Connected correctly No the wiring diagram Eliminate the malfunction Yes No Yes J Replace the The connection wire is broken Yes Eliminate the malfunction Yes connection wire No No N_ _ Check if there is power input bewtween the netrual wire and live wire of the outdoor mainboard Replace the filter board of the outdoor unit There is power input No Eliminate the malfunction Yes Replace the outdoor mainboard Replace indoor mainboard Resume communication End 34 9 Installation and Maintenance Service Manual 9 Anti high temperatureand overload malfunction Main checking points Ifthe outdoor ambient temperature is within the normal range If the indoor fan and outdoor fan are running normally if the indoor and outdoor radiation environment is good Flow chart If the outdoor ambient temperature is above 53 C Yes No If the indoor and outdoor radiation Yes is insufficient N2. If the eletric expansion valve is connected well or it is broken If there is refrigerant leakage If the overload protector is broken Flow chart If the overload protector is connected well Yes Check the resistance between the two ends of the overload protector in ambient temperature if the resistance is below 1k No Yes Reconnect according If the wiring of the eletric expansion valve is coonected well No gt to the wiring diagram Yes Replace the P Check the coil of the eletrid expansion valve replace it if it is broken Eliminate the malfunction No overload protector Check the refrigerant status if there is refrigerant leakage recharge it according to the service manual Eliminate the malfunction No Yes gt Replace outdoor mainboard Note the detection method of the coil of the eletric expansion valve there is five pieces of coil of the eletric expansion valve the resistance of one of them the leftmost or the rightmost one is almost the same as the resistance of other terminal within 100 Q Judge the condition of the electronic expansion valve through detecting these resistance Installation and Maintenance o Service Manual 5 Start failuremalfunction Main checking points If the connection wire of the compressor is connected properly If the stop duration of the compressor is suff
3. S Ooo S rs a ae a R o d oo P a re as a ee ooo S E O 23 Service Manual Pres is ae ast tes a as 20 tes ee ast 2 es _ Fas 2 tes a Fret 25 es ss ash 2 tes E Liquid pipe temperature sensor malfunction of E Flash 25 times fF nef Feszes ee SS Ss Ss Exit of the condenser tube sensor malfunction Flash 27 times Flash 7 Correspondence is normal times n indoor unit number Often bright indoor unit all Communication failure Indoor ambient sensor malfunction PF parserna O SiC v mna O e S S S bamprcapnetinionprasces mareen OO O o Communication failure between indoor unit and outdoor unit 9 2 Malfunction Checking and Elimination 1 IPM protection malfunction Main checking point e Ifthe input voltage of the unit is within normal range e If the connection wire of compressor is connected well Is it loose If the connection sequence is correct e If the resistance of compressor coil is normal If the isolation of compressor coil with copper pipe is good e If the unit is overloaded If the heat radiation of the unit is good e If the refrigerant charge is suitable Flow chart 24 9 Installation and Maintenance Service Manual Energize the unit Please check 1 ifthe indoor and outdoor heat exchanges are dirty if there is obstacle to affect the radiation 2 if the indoor and outdoor fans are running normally If the above ca
4. Main board is damaged A R the main board with the same model 36 ee Installation and Maintenance Service Manual 4 ODU Fan Motor Can t Operate Discriminating method air conditioner status Troubleshooting Connect wires according to wiring diagram to make sure all wiring terminals are connected rong wire connection or poor Check the wiring status according to circuit diagram Change compressor oil and refrigerant If no better replace the compressor with a new one Connect wires according to wiring diagram to Check the wiring status according to circuit ay make sure all wiring terminals are connected diagram Measure the capacity of fan capacitor with an universal meter and find that the capacity is out o the deviation range indicated on the nameplate of an capacitor Power voltage is a little low or Use universal meter to measure the power SUPPIY g y st tegus with voltage keatitator high voltage The voltage is a little high or low 99 quip ge reg Use universal meter to measure the resistance Coil of compressor is burnt out Pe Repair or replace compressor between compressor terminals and it s 0 Cylinder of compressor is blockediCompressor can t operate Repair or replace compressor 6 Air Conditioner is Leaking Discriminating method air conditioner status Troubleshooting Drain pipe is blocked Water leaking from indoor unit ae the Toreigm objects inside the drain Drain pipe is broken Water leaki
5. cord esa for air swine j fter energization air switch trips off Select proper air switch After energization operation indicator is bright Malfunction of remote controller while no display on remote controller or buttons have no action After energization room circuit breaker trips off at Electric leakage for air conditione once Replace batteries for remote controller Repair or replace remote controller 2 Poor Cooling Heating for Air Conditioner Possible Causes Discriminating Method Air conditioner Status Troubleshooting Set temperature is improper Observe the set temperature on remote controller Adjust the set temperature ROrAton Speedo NEIDETAN Small wind blow Set the fan speed at high or medium motor is set too low Filter of indoor unit is blocked Check the filter to see it s blocked Clean the filter F re Check whether the installation postion is proper 4 r F a Installation position for indoor unit cording to installation requirement for air djust the installation position and install the and outdoor unit is improper conditioner rainproof and sunproof for outdoor unit Discharged air temperature during cooling is higher than normal discharged wind temperature Discharged air temperature during heating is Find out the leakage causes and deal with it lower than normal discharged wind temperature Add refrigerant Unit s pressure is much lower than regulated range Malfunction of 4 way valve Blo
6. malfunction Main checking points f the outdoor fan is blocked by foreign objects The connection wire of DC fan is connected reliably If it is loose Flow chart Turn on the unit after removing the foreign objects Check if the outdoor fan is blocked by Yes foreign objects No Turn on the unit after the connection wire is properly connected If the connection wire Yes of DC fan is loose No Replace the outdoor mainboard Service Manual Installation and Maintenance Service Manual 8 Communication malfunction Main checking points Ifthe connection wire between the indoor unit and outdoor unit is connected well if the wires inside the unit is connected well If the indoor mainboard or outdoor main board is broken Flow chart Communication malfunction of some indoor units De energize check if the connection wire of indoor and outdoor unit and the wire of the eletric box is connected correctly Reconnect according to Connected correctly No Eliminate the malfunction the wiring diagram Yes q _ SE Yes De energize change the communication wire of the well communicated indoor unit and malfunction indoor unit then energize the unit and wait for 3min The malfunction indoor unit Replace outdoor mainboard resumes normal Replace the mainboard of the malfunction indoor unit Installation and Maintenance Service Manual
7. Service Manual 9 Troubleshooting 9 1 Malfunction Indicator The error code will be displayed on the wired controller and the main board of the outdoor unit The meaning of each error as shown in table 13 Name of malfunction Compressor runs Anti freezing protection IPM protection AC over current protection burden protection Compressor exhaust high temperature protection Compressor overload protection Power protection EEPROM reads and write protection Low PN voltage protection Over voltage protection for PN PFC module temperature protection Low pressure protection High pressure protection Limit decline frequency electric current Frequency limit exhaust Frequency limit Over burden Outdoor ambient sensor malfunction Outdoor tube sensor malfunction Exhaust sensor malfunction Attain the temperature of switch on Frequency limit power Outdoor fan malfunction Frequency limit PFC module temperature PFC module sensor malfunction Liquid pipe temperature sensor malfunction of A Installation and Maintenance oO The indicator display Indoor displa Yellow light Red light Green light pay Flash once Flash 11 times a a room i Fena i Fan Tunes Fn tones S Flash 1 times O n Fae 2s Fa es Fra ies Fra es aes series Fre Fre Fre es Fre es Fe 7 a ee E o d e o 5 re ae a d ae d e Ooo T a O O P de o E B
8. e eletric expansion valve is working normally or it is broken If the radiation of the unit is good Flow chart The unit appears desynchronizing as soon as energizing and starting The stop duration of the compressor is longer than 3min Yes The wiring of the compressor is No Reconnect the wire proper connected properly Yes __________ No Eliminate the malfunction Yes Replace the eletric The eletric expansion valve is broken expansion valve Yes Eliminate the malfunction Replace the outdoor mainboard Eliminate the malfunction Replace the compressor Installation and Maintenance 28 Desynchronizing happens during operation Outdoor unit is working No Yes Unit radiation is good No Yes Input voltage is normal No Yes Refrigerant amount is too much Yes No Replace the outdoor mainboard Eliminate the malfunction Yes Replace the compressor Check if fan terminal is connected well Improve radiation situation of the unit such as cleaning the heat exchanger improve ventilation Turn on the unit after the power supply voltage resumes normal Charge refrigerant according to the service manual Replace the fan capacitor Replace the outdoor unit Service Manual Installation and Maintenance Service Manual 4 Compressor overload diacharge protectionmalfunction Main checking points
9. icient f the compressor is broken If the refrigerant charging amount is too much Flow chart The stop duration of the unit is not enough the high and low pressure of the system is not balanced restart it after 3min Energize and start the unit If the stop duration of the compressor is longer than 3min No econnecttheconnectionwire No ofthe compressor according to the wiring diagram Eliminate the malfunction If the connection wire of the compressor is connected well and correctly f the refrigerant charging amount is too much Charge the refrigerant according to the service manual No mainboard Lie onal Yes No ee Installation and Maintenance Service Manual 6 Temperature sensor malfunction Main checking points Ifthe temperature sensor is damaged or broken Ifthe terminal of the temperature sensor is loosended or not connected If the mainboard is broken Flow chart Check whether the wiring terminal between temperature sensor and controller is loosened or poorly contacted Yes Insert the temperature sensor tightly Eliminate the malfunction No No Yes Check whether the temperature senspr is normal according to Replace the temperature sensor with the same model resistance table Eliminate the malfunction6 Replace the controller with the same model Installation and Maintenance o 32 7 DC fan
10. ng from drain pipe Replace drain pipe rapping is not tight bie eadar ki fom the pipe connectonplageot rap it again and bundle it tightly 7 Abnormal Sound and Vibration hen turn on or turn off the unit he panel and other parts will There s the sound of PAPA Normal phenomenon Abnormal sound will expand and there s abnormal disappear after a few minutes ound hen turn on or turn off the unit here s abnormal sound due Normal phenomenon Abnormal sound will aie f Water running sound can be heard z o flow of refrigerant inside air disappear after a few minutes onditioner Foreign objects inside the indoor Remove foreign objects Adjust all parts unit or there re parts touching There s abnormal sound fro indoor unit position of indoor unit tighten screws and stick ogether inside the indoor unit damping plaster between connected parts Foreign objects inside the outdoo Remove foreign objects Adjust all parts unit or there re parts touching There s abnormal sound fro outdoor unit position of outdoor unit tighten screws and ogether inside the outdoor unit tick damping plaster between connected parts Short circuit inside the magnetic During heating the way valve has abnormal i t Replace magnetic coil oil electromagnetic sound Abnormal shake of compressor Outdoor unit gives out abnormal sound ans ie SURO Teoh aL ot compressor ighten the bolts If add too much refrigerant during maintenance Abnormal sound inside the compressor plea
11. o Ifthe outdoor fan is working normally No Yes Replace outdoor mainboard End Installation and Maintenance ee It is a normal protection please operate the unit after the outdoor ambient temperature has changed Improve the radiation environment of the unit Check if the terminal of the fan is connected well if the fan is broken Replace fan capacitor Replace outdoor fan 35 Service Manual 9 3 Maintenance Method for Normal Malfunction 1 Air Conditioner Can t be Started Up Possible Causes Discriminating Method Air conditioner Status Troubleshooting Confirm whether it s due to power failure If yes No power supply or poor After energization operation indicator isn t bright wait for power recovery If not check power onnection for power plug land the buzzer can t give out sound upply circuit and make sure the power plug is onnected well rong wire connection between indoor unit and outdoor unit Under normal power supply circumstances or poor connection for wiring operation indicator isn t bright after energization erminals Check the circuit according to circuit diagram and connect wires correctly Make sure all iring terminals are connected firmly Make sure the air conditioner is grounded reliably Make sure wires of air conditioner is connected correctly Check the wiring inside air conditioner Check hether the insulation layer of power cord is damaged if yes place the power
12. se reduce refrigerant properly Replace ompressor for other circumstances Replace the compressor capacitor Abnormal sound inside the Installation and Maintenance 37
13. ses are existed 3 if the pressure of the system is too high 4 if the refrigerant is too much which causes the high level of pressure Correct according to the service manual and then energize the If the wire of compressor is connected unit to operate well and correctly Reconnect the wire of the compressor according to the correct wiring method Test the resistance between the three phases If the resistance is normal Yes Test the isolation impedance between the three phases of the compressor and thecopper pipe Yes If the resistance is above 500M Q Replace the compressor Yes Malfunction is eliminated Replace the outdoor mainboard Installation and Maintenance o 25 26 2 PFC protection malfunction capacity charging malfunction Main checking points If the wiring of the induction is connected well and if the induction is broken If the mainboard is broken Flow chart Check If the power supply is normal Turn on the unit after the power supply resumes to normal situation Power supply is abnormal Check if the outdoor induction is broken The induction is broken Replace the induction Malfunction is eliminated Replace the outdoor mainboard Service Manual 9 Installation and Maintenance Service Manual 3 Compressor desynchronizing malfunction Main checking points If the pressure of the system is too high If th
14. w cold wind during heating Replace the 4 way valve Discharged air temperature during cooling is higher than normal discharged wind temperature Discharged air temperature during heating is Malfunction of capillary lower than normal discharged wind temperature Replace the capillary Unit t pressure is much lower than regulated range If refrigerant isn t leaking part of capillary is blocked Flow volume of valve is The pressure of valves is much lower than that sa P Open the valve completely insufficient stated in the specification Malfunction of horizontal louver Horizontal louver can t swing Pei point a or mamtenance methadon Malfunction of the IDU fan motor The IDU fan motor can t operate Refer to troubleshooting for H6 for maintenance method in details Malfunction of the ODU fan motor The ODU fan motor can t operate Fet fei point koi maintenance metNod for Malfunction of compressor Compressor can t operate Pai point 5 of maintenance method for 3 Horizontal Louver Can t Swing Possible Causes Discriminating Method Air conditioner Status Troubleshooting i fo Connect wires according to wiring diagram to rong wire connection or poor Check the wiring status according to circuit makesurealltwiring terminals are connected onnection diagram irmly 9 Refrigerant is leaking Stepping motor is damaged Stepping motor can t operate Repair or replace stepping motor Others are all normal while horizontal louver
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