Neptune Front Load Washer Technical Information
Contents
1. 1 1 1 1 1 1 i 1 1 1 1 1 DOOR LOCK uo op MOTOR POWER NOTOR PONER HEATER 1 1 RLS OUTPUT MATER ER SOF TENER DRAIN PUMP i RL4 ALE ati RL OUTPUT RL3 RLI2 Bia i cera Ga i 1 1 1 1 1 1 1 i i 1 1 CONN cow P3 510008 LOCK SWITCH INPUT TI T3 8 5 T6 T1 T8 CONN JH 1 CONN a 1 CONN 1 i WALVE_THERMISTOR 91919 Clolelolololo Pi P6 f 1 OALVE THERMISTOR azg az 95 2 a Elz 3 5 f LOWER LVL SENSE es 3 728 z 1 ener Bee sz 52 5 i 124 voe JZ 3 8 a EEE Sof 2 I Jour or BALANCE S sx a J arad 2 E 8 8 1 z I i CONN 1 1 2 MACHINE CONTROL ol B i o Bz i MEMBRANE Eje i SWITCHES i zz i 1 ker a I lllllilill al eee DOOR CLOSED ee Torerrsr 2828 T Y ct Tz T SWITCH t BU com A Y WEATER HEATER a DOOR LOCK THERMISTOR BK SWITCH C2. at the hot valve check for 120VAC at the T Control Board between P1 3 and P8 2 If m TRI _ 120VAC is present at the Control Board check E or replace the wire harness If 120VAC is not LCD Washer Control Board present at the Control Board replace the S Ines oem EA Control Board If hot water flows turn the hot As a neutral reference E valve off by pressing the toggle hof button RLI RL2 RLI RL3 RLA RL8 RN RLT RLG 5 L5 8 J10 Tol System Check System Checks can be initiated at any time If the HT ossos 2 washer is not in a wash cycle the following screen will oo qe PI P2 display and allow the technician to toggle various components On Off The MAH7500 Machine Control Boards low voltage DC Screen with washer in a wash cycle outputs are isolated from the 120V circuitry le outputs press F to 1099 P heck Neutral from the incoming line cannot be used to cancel to go to system cnec achieve a valid 24VDC reading OUTPUT STATUS INPUT STATUS hot water OFF door closed Board Input Output Chart cold water OFF door unlocked bleach valve OFF no unbalance Conn Reference fabric softener OFF wash level low full B Pin Conn i t drain OFF rinse level high full escr Number Pin Comments motor control OFF fill temp 70 85 F
3. Number heat OFF sump temp 72 Bleach 450 Torque 3 RPM 47 water valve P1 5 8 2 output cancel cycle exit system check Cold water Pid Baio 120 500 1K valve output 2 VAC ohms ith th h h le Door Lock 60 Screen wi e washer not in a wash cycle P1 1 P8 2 e Ue usen System Check puse Door Lock P3 8 P2 3 24VDC Locked Switch input 24VDC toggle toggle INPUT STATUS Door switch pg 1 P8 2 120 Closed hot on cold on input VAC 120VAC door closed Door Unlock 60 toggle toggle door locked output P8 3 P8 2 millisecond bleach on fab soft on no unbalance VAC puls wash level low full Drai 120 toadle toggle rinse level high full 8 2 99 99 A output VAC drain on mtr ctrl on fill temp 70 85 F E Heater 120 sump temp 72 P6 1 P8 1 RPM 0 Neutral VAC toggle exit system High water 54 8 P8 2 120 heater on check level input 8 2 VAC Hot water 120 500 1K valve output 1 3 ad VAC ohms December 2004 7 2004 Maytag Services 16025823 Troubleshooting WARNING To avoid risk of electrical shock personal injury or death disconnect power to washer before servicing unless testing requires it Conn Reference Descr Pin Voltage Comments Number Pin Number P7 Connector L1 to machine P6 2 P8 2 120 Ribbon control VAC bod Harness L1 to motor 120 control P6 3 2 VAC Low
4. below the low Go to Will Not seconds to start the Service Mode The following water level ina Drain page 4 information will appear on the touch screen final spin EE 2 listo uniock after 11 Will Not Quick Spin Test unlock attempts Unlock page 4 Continuous fill service tests diagnostic code No fil die nutes S la Mo Water or total fill of 14 page SRM 4 Diagnostic code 1 minutes Door failed to PARTS 0 Torque 9 Diagnostic code 2 4 The door lock after 11 Go To Will Not q fails to lock Lock page 3 0 Unbal 6 Diagnostic code 3 attempts Continuous Go to Wet 4 Diagnostic code 4 unbalance Unbalance Clothes page 3 svstem check 5 circuit circuit is always See unbalance y exit service During Spin open harness only connections Motor did not turn after 10 Go to Motor Drive consecutive System Test retry attempts 6 Locked rotor December 2004 1 2004 Maytag Services 16025823 gnostic Codes WARNING To avoid risk of electrical shock personal injury or death disconnect power to washer before servicing unless testing requires it Diag 2 Diag Code Description Trigger Action to be Taken Code Description Trigger Action to be Taken Temperature heater and 1 Customer may Heater har ris
5. the washer is running during Service Cycle the screen will display the various inputs and outputs of the washer System Check See System Check will allow you to perform system checks of the various inputs and outputs of the washer Advance To Next Step Selecting advance to next step button advances the cycle to the next step in the cycle December 2004 2004 Maytag Services Troubleshooting WARNING To avoid risk of electrical shock personal injury or death disconnect power to washer before servicing unless testing requires it Quick Spin Test To begin test select quick spin test button The washer will display the following during the test Static Drain Spin to 350 RPM Spin to 550 RPM Spin to 600 RPM Spin to 650 RPM Spin to 800 RPM Spin to 1000 RPM Coast down and unlock at 0 RPM Quick Spin Test complete Any of the steps in this test can be held or paused up to 30 minutes by touching the hold at this step button cancel amp exit quick spin test returns you to the Service Tests screen Motor Drive System Test Perform a Motor and Motor Control Test Motor amp Motor Control Test 1 Disconnect power to the washer 2 Remove the front panel and pull the JP4 Connector from the Motor Control Board Neutral Ground Harness ON a gt Motor Harness 7 Harness NK December 2004 2004 Maytag Services 3 Reconnect
6. there is continuity check or replace the wire harness If more than 60VAC is present at the Control Board replace the Control Board If the high water level is shown as empty turn the Cold Water Valve on by pressing the toggle cold button Verify that cold water is flowing in the dispenser If it is not flowing check the Cold Water Valve for 120VAC between the BU and WH wires If 120VAC is not present at the cold valve check for 120VAC at the Control Board between P1 4 and P8 2 If 120VAC is present at the Control Board check or replace the wire harness If 120VAC is not present at the Control Board replace the Control Board If cold water flows turn the cold valve off by pressing the toggle cold button Drain all of the water out of the washer by pressing the toggle drain button until drained then turn the drain off Turn the Hot Water Valve on by pressing the December 2004 2004 Maytag Services Troubleshooting WARNING To avoid risk of electrical shock personal injury or death disconnect power to washer before servicing unless testing requires it toggle hot button Verify that hot water is flowing in the dispenser If it is not flowing Machine Control Board Input Outputs check the Hot Water Valve for 120VAC between the OR and WH wires If 120VAC is not present
7. Diagnostic code 62 during unlock the Tach 43 occurred when the Motor Control was powered during unlock request Unlocking attempts No Tach Signal Informative only Refer to disallowed because observed when Diagnostic code 02 Tach Signal continues Motor Control is 44 after Tach verification powered at the end of the failed fast power up and unlock retries Door locked when not Check Door Lock Switch for 45 expected welded contacts Cabinet impact sensed Cabinet impact Informative only 46 detected by the frame vibration December 2004 11 2004 Maytag Services 16025823 Troubleshooting WARNING To avoid risk of electrical shock personal injury or death disconnect power to washer before servicing unless testing requires it sensor Door did not lock after The Door Lock Informative Only the first try Switch did not go from 47 unlocked to locked when the door lock output was energized Door did not unlock after The Door Lock Informative Only the first try Switch did not go from locked 48 to unlocked when the door unlock output was energized 16025823 12 December 2004 2004 Maytag Services Wiring Diagram WARNING To avoid risk of electrical shock personal injury or death disconnect power to washer before servicing unless testing requires it BOARD MOUNTED RELAYS
8. Neptune Front Load Washer Technical Information MAH7500 Due to possibility of personal injury or property damage always contact an authorized technician for servicing or repair of this unit Refer to Service Manual 16010061 for detailed installation operating testing troubleshooting and disassembly instructions CAUTION All safety information must be followed as provided in Service Manual 16010061 WARNING To avoid risk of electrical shock personal injury or death disconnect power to washer before servicing unless testing requires power Service Technician Please Note Access diagnostic codes through Service Mode before beginning repair SERVICE MODE Press the diagnostic code on the touch screen to see The Service Mode provides service personnel the ability of the diagnostic codes that have been logged See to verify the operation of the washing machine The the following table for their descriptions triggers and Service Mode can be entered at any time While in the actions to be taken Service Mode the servicer can start special service tests such as a service cycle While in the Service DIAGNOSTIC CODES Mode menus can be displayed and a variety of other Diag zr information about the machine be accessed Description Trigger Action to be Taken The water level ACCESSING SERVICE MODE failed tordror Press and hold the back and help keys for 4 No Drain
9. OM 6 POS INLINE BU TUB ON CONN re DISPLACEMENT DOOR LOCK E COM NC SWITCH SOLENOID Bs LOCK a x J 2 con 7 FRONT WEIGHT d Pr DI rus WL CON NC N UNLOCK Seal ia POM SWITCH BU EMI INERTIAL UNBALANCE FILTER CON ANC SWITCH PRESSURE SWITCH 120 VAC LINE qp 2 MOTOR 120 VAC 6 g 3 Rro CONTROL NEUTRAL I D MOTOR GND 5 ls GND no gt WATER is z 38 X dm VALVE O7 NR O8 Dui D DRAIN PUMP c E 2 9 9 9 CABINET FRAME 1 WwW T I Wi December 2004 2004 Maytag Services 13 16025823
10. e filling washer e Check the owner s water heater It should be set to deliver a minimum 120 F 49 C hot water at the tap Also check water heater capacity and recovery rate e fthe water heater is located a long distance from washer water line may need to be purged prior to starting wash cycle e Disconnect inlet hoses and clean screens e This washer can sense if the fill hoses have been reversed between hot and cold If the fill hoses on the washer were previously installed 16025823 incorrectly and then corrected the washer will need to run through a Hot Cold cycle If not resolved check for proper resistance on the water valve thermistor See Board Input Output Chart pages 7 8 Diagnostic Tests Touching any of the screens on the washer control panel will initiate the corresponding test Service Tests user service cycle interface test y advance to next step exit service tests system check User Interface Tests This test will check the touch screen and the membrane pad The technician will be prompted what to do Service Cycle The Service Cycle is used to run a quick cycle that performs all of the normal wash cycle functions Initiating a Service Cycle If the washer is not operating in a wash cycle touch the button service cycle to begin the Service Cycle During a wash cycle Press the service cycle button then cancel the wash cycle and start the washer in the Service Cycle If
11. e not sump thermistor for erie The door has have tried to 7 detected when continuity Was repeat wash cycle heating switch was not been heater was on with no without opening 17 not detected jopened after a for 10 minutes water fill Spern since complete Wash door The low water P 2 Go to Door the final cycle level is not Lock Test page ie spin Water satisfied before 6 84 sensor lev l the high water Go to No Fill Door lock 1 Clear the level contacts Test page 6 Door lock POO diagnostic code fault switch is are opened in 18 detected detected a recheck the pressure open during 2 Go to Door i open with switch cycle motor rannih Lock Test page 9 Not Used 9 6 Did not reach 19 21 Not Used Low RPM 500 RPM due i Door switch is 10 unbalanced toan aes Door switch detected as Check harness load unbalanced pag detected open and the at door load 22 Sven d nn door lock open closed switch 1 Unplug and p 9 switch is and for switch cycle sine reconnect power perceived as continuity agus cord at power locked 11 supply outlet Door is Door lock is PROP y memory 2 If condition still 23 locked at locked and user Go to Will not exists replace start of tries to starta Unlock page 4 Machine Control cycle cycle Board Motor tach 12 14 Not Used 24 Motor over signal detected Replace Motor A ke
12. er water Empty level input 9 P2 3 24 0 aang Motor control tach P241 pe 20006 oO Neutral 120 VAC P8 2 Neutral E Unbalance No 2 Input P3 2 P2 3 24vpc balance condition n 6260 Pin No 1 oftener water valve 1 6 P8 2 VAC Sump Heater Dependent Thermistor P5 3 P5 4 1 5VDC on temperature Torque UT P2 2 P2 3 24VDC Water valve MEMBRANE PAD CHECKS Check the Membrane Pad by pulling the P7 connector from the Machine Control Board and locating the corresponding switch pin numbers in the ribbon harness There should be lt 100 ohms present when the pad is pressed Membrane Pad Pin Number Pin Number P7 3 P7 5 P7 4 P7 5 16025823 8 December 2004 2004 Maytag Services Troubleshooting WARNING To avoid risk of electrical shock personal injury or death disconnect power to washer before servicing unless testing requires it HELP CODE TABLES Help Description Code Trigger Action To Be Taken Plaster Unbalance Load Unbalance load Informative only non critical Detected condition existed condition during initial 1 ramp up of spin cycle Resulted in redistribution cycle 2 6 Not Used Slow drain Low water level Check for restricted drain contacts of system kinked plugged drain 7 Pressure Switch hose or pump Check pump for not seen as proper function May see resetting atend diagnostic code 01
13. hose is correctly inserted and secured to drain facility e Avoid overloading which can push the door partially open e Check internal hose connections e Check tub cover Remove reposition and reinstall the tub cover seal Seal seam must be at the top of the tub cover Display Lights Up When Door Opened e This is normal behavior No Tumble e Washer does not tumble for the first 30 seconds after the door has been opened for safety purposes e Fabric cycles such as DELICATES and HAND WASH only tumble for a few seconds every 30 seconds e Check for loose connections at Machine Control Board Motor Control Board and Motor e Perform Motor Drive System Test e Washer does not tumble during some drains and rinse fills No Water Fill e Check to make sure water supply is fully turned on Normal water level is only 2 5 to 5 inches inside and toward the rear of the spinner e Check for kinks in inlet hoses e Check for clogged inlet screens e Visually check hot and cold separately at dispenser for proper flows e Perform No Fill Test page 6 e Clothes washer should be leveled properly as outlined in installation instructions e Weak floors can cause vibration and walking e Check for loose lower front weight e Verify rubber feet are installed on leveling legs December 2004 2004 Maytag Services Check that the leveling leg lock nuts are tightened If complaint is a high pitched noise during fill then d
14. injury or death disconnect power to washer before servicing unless testing requires it Will Not Unlock e Unplug and reconnect the power cord Wait 2 minutes to see if machine unlocks e Check for door locked switch circuit to be closed at Machine Control See Board Input Output Chart pages 7 8 e Check to make sure belt has not fallen off e Check for loose electrical connections at door lock and at Machine Control Board e Perform Motor Drive System Test Will Not Start e Plug cord into live electrical outlet e Check fuse or reset circuit breaker e Push the off button then open and close the door Push the start pause button to start the clothes washer e Check to see if the washer is in a pause or soak period in the cycle Wait briefly for cycle to change e Check for restricted drain system Will Not Drain e Check for restricted drain system e Check low and high water levels Perform No Fill Test e Check for 120 VAC at the pump when a spin cycle is selected Wrong Water Temperature e Too Hot Too Cold since this product uses a low amount of water the board regulates the incoming flow to temper the actual temperature of the water in the tub This may appear to be significantly warmer cooler than expected e Are both faucets turned ON fully e Make sure temperature selection is correct e Make sure hoses are connected to correct faucets and inlet connections Flush water line befor
15. is disabled if the Motor Control Board indicates the spinner speed is 7 RPM Rotating Door Lock Unlock Cam peed Solenoid Door Open Closed Switch Spring Mechanical Opener _ S Emergency m 0 Cord Se MM Solenoid Door Lock Unlock Door Actuator Push Rod Switch Door Unlock Test 1 Press off verify the Door Lock Unlock solenoid harness connections are not loose and wiring is correct Does the door unlock 2 Disconnect power to the washer and perform a continuity check between Conn P8 3 of the Machine Control Board and the Neutral prong on the power cord There should be continuity Door Lock Test 1 Start a system check cycle verify the Door Lock Unlock solenoid harness connections are not loose and wiring is correct Does the door lock 2 Disconnect power to the washer and perform a continuity check between Conn P1 1 of the Machine Control Board and the Neutral prong on the power cord There should be continuity No Fill Test 1 Verify that the cold and hot water supplies at the faucet are turned on and can supply water 2 Remove the hoses and clean out any debris from both ends and the hot and cold water valves 3 Close the door and start a spin cycle to drain all water from the washer to reset the Pressure Switch 4 Press and open the door to verify that all water is removed from the washer If water is still present Go to page 4 5 If wa
16. isconnect supply hoses and clean screens Check for proper spring placement of outer tub support springs Check strut operation Tub is completely full of suds Run the clothes washer through another complete cycle using cold water and no more detergent Reduce detergent amount in the future for that specific load size and soil level Towel loads have a minimal amount of soil present and typically create more suds Use high efficiency or low sudsing detergent specially formulated for front load washers Check for restricted drain system Check for loose wire connections at Control Board and Drain Pump Check to see if belt is off motor and pulley Perform Motor Drive System Test Wet Clothes Very small clothes loads can cause unbalances Add additional towels Excessive suds may have been present Check for diagnostic code 16 Check unbalance harness connections at all switches and at main harness connection on top of Outer Tub Assembly for connectivity Inertial Unbalance Switch tripped too soon resulting in lower spin speeds Run Quick Spin Test to check unbalance switches and Control Board Check for restricted drain system Perform Motor Drive System Test Will Not Lock Check to see if the door is closed Check electrical connections at lock assembly and Machine Control Board Perform Door Lock Test 16025823 Troubleshooting WARNING To avoid risk of electrical shock personal
17. of drain cycle One locked rotor During startup Informative only non critical the Spinner did condition 8 not reach 10 rpm within 2 sec During Wash Tumble Fill hoses are reversed Water Valve Inlet hoses reversed at the Thermistor faucets for Hot and Cold readings are 9 contrary to what is being demanded by washer Control Board Locked rotor condition 10 during a spin Locked rotor condition during a spin Informative only non critical condition 11 Not Used Too much power at 12 speed gt 850 rpm Motor on at full power for 30 seconds at gt 850 rpm Informative only non critical condition Low Speed Unbalance Detected 13 Opening of Unbalance Switches at speed 500 rpm and gt 100 rpm during a spin Informative only non critical condition High Speed Unbalance Detected 14 Opening of Unbalance Switches at speed gt 850 rpm and during a final spin Informative only non critical condition December 2004 2004 Maytag Services 16025823 Troubleshooting WARNING To avoid risk of electrical shock personal injury or death disconnect power to washer before servicing unless testing requires it 15 Not Used Spin suds lock Suds lock full Too much detergent non HE power given to detergent with suds suppressor motor by Motor being used washing clothe
18. orm Motor Drive System 35 Wash Tumble requested in Test Check wire harness Wash Tumble connections at Motor Motor 16025823 10 December 2004 2004 Maytag Services Troubleshooting WARNING To avoid risk of electrical shock personal injury or death disconnect power to washer before servicing unless testing requires it Control Board JP4 connector and Machine Control Board connections Motor still running after Motor still Informative only 240 seconds of coast running after 36 down after a spin 240 seconds of coast down after a spin Motor running during 1 minute after Informative only 37 tumble for too long start of tumble if speed is gt 85 RPM 38 Not Used 39 The door Is not locked Motor running Perform Motor Drive System while spinning gt 85 RPM and Test Check wire harness 40 the door is not Perform connections at Motor locked Motor Control Board JP4 connector and Machine Control Board connections Loss of Tach Signal Cycle was Informative only Refer to during door unlock paused due to Diagnostic code 62 41 sequence failure to verify Tach Signal during unlock request Motor Control Not Cycle was Informative only Refer to Powered During Unlock paused because Diagnostic code 62 Motor Control 42 not powered during unlock request Tach Signal Cycle was Informative only Refer to unexpectedly present paused because
19. s Control Board with minimal amount of soils for 1 second present with normal measure 16 within a spin at amount of detergent less than 500 RPM for example during the spin cycle High speed unbalance Opening of Informative Only detected Unbalance 17 Switches at speed gt 500 RPM and during a final spin 18 Not Used Power down Loss of power Will indicate power failure until a key is pressed If a cycle was in process prior to loss of 19 power then pressing start pause key will resume cycle and clear the PF display 20 Not Used Fast fill Fill level Possible slow drain scenario reached within 2 present or customer interrupted 21 seconds of fill wash cycle and started washer initiation over again Check for Diagnostic Code 08 22 Not Used Too Much Power At 550 Motor on at full Informative Only 23 850 rpm power too long between 550 850 rpm 24 Not Used 29 Excessive Suds Control Board Too much detergent non HE Detected During detects motor detergent with suds suppressor 33 Wash Tumble torque dropping being used washing clothes with minimal amount of soils present with normal measure amount of detergent Too much power at start Maximum torque Perform Motor Drive System of spin requested in Test Check wire harness 34 Spin Less Than Perform connections at Motor 110 RPM Motor Control Board JP4 connector and Machine Control Board connections Too much power during Maximum torque Perf
20. ter is drained out close the door and enter service mode press help and back for 16025823 11 12 seconds Obtain access to the Water Valve Pressure Switch and Control Board for voltage checks by raising the Top Cover and loosening the Console now Make sure the door is closed Enter the System Check mode by pressing the appropriate button on the touch panel The door should lock when System Check mode is entered Verify that the low water level is empty wash level low empty If the low level is full check the low water level input at the Control Board connector by reading the DC voltage between P3 5 and P3 3 If more than 2VDC check the voltage at the Pressure Switch between the BU and the BR wires If more than 2VDC replace the Pressure Switch If voltage is not present at the Pressure Switch check or replace the wire harness If no voltage is present at the Control Board replace the Control Board If the low water level is shown as empty verify that the door is sensed closed The Control Board cannot sense the high water level with the door open Verify that the high water level is empty rinse level high empty If the high level is full check the high water level input at the Control Board connector by reading the AC voltage between P1 8 and P8 2 If less than 60VAC check the continuity at the Pressure Switch between the GY and YL wires If no continuity replace the Pressure Switch If
21. the washer power cord to supply voltage 4 Press and hold the help and back keys for 3 seconds to start the Service Mode 5 Select system check touch toggle motor control on 6 The Motor Control will immediately execute a test routine and the motor should run rotating the spinner at 50 rpm 7 Ifthe motor runs and the spinner rotates at the proper RPM the problem lies outside of the motor and Motor Control Circuit 8 Ifthe motor runs but the spinner does not rotate Check for missing belt 9 Verify 120VAC at L1 and N connection at Motor Control Board 10 If voltage is present then problem lies with the motor and Motor Control System 11 Disconnect power to the washer and reconnect the JP4 Interface connector to the Motor Control 12 Check for loose electrical connections at motor and Motor Control Board 13 Check phase windings of the motor c m 155 195 Ohms 14 If motor windings are good replace the Motor Control Board If voltage is not present 15 Check loose electrical connections at Machine Control Board or broken wires in harness 16 Check door actuator switch and related wiring 16025823 Troubleshootinc WARNING To avoid risk of electrical shock personal injury or death disconnect power to washer before servicing unless testing requires it Door Lock Unlock Test Note The relay on the Control Board for the door unlock mechanism
22. y is sensed speed at maximum Control Board to be pressed speed for more than Replace Membrane Clear diagnostic 15 Stuck key 75 seconds the switch no c Tach signal codes possible line key is assumed 25 MR exists without noise issue If to be stuck torque problem persists motor Speed never nnl command replace Motor exceeded 500 9 Control Board High speed 26 27 Not Used not achieved cycle Go to Wet Valve high low Go to Wrong 16 due to high i Water Experienced Clothes page 28 thermistor temperature or z motor maximum fail h ist Temperature torque ailure ohm resistance page 4 torque for detected extended Abnormally period Sump high low Check lames connections check 29 thermistor temperature or Abus continuity of sump failure ohm resistance themistor detected 62 Unlock Conditions for Go to Will Not problem unlock not met Unlock 16025823 December 2004 2004 Maytag Services Troubleshooting WARNING To avoid risk of electrical shock personal injury or death disconnect power to washer before servicing unless testing requires it Note If any unused codes appear on the screen disregard these codes This is normal The non listed codes are insignificant codes TROUBLESHOOTING THE SYMPTOMS Leaking e Make sure supply hose connections are not leaking Check for rubber gasket damage due to over tightening e Make sure end of drain
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