Maytag Neptune MAH7500 Service Menus Diags

Neptune Front Load Washer⎯Technical InformationMAH7500* • 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. ! ! Service Technician Please Note: 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. Access diagnostic codes through Service Mode before beginning repair. SERVICE MODE The Service Mode provides service personnel the ability to verify the operation of the washing machine. The Service Mode can be entered at any time. While in the Service Mode, the servicer can start special service tests such as a service cycle. While in the Service Mode, menus can be displayed and a variety of other information about the machine can be accessed. ACCESSING SERVICE MODE Press and hold the “back” and “help” keys for 3 seconds to start the Service Mode. The following information will appear on the touch screen. Press the “diagnostic code” on the touch screen to see all of the diagnostic codes that have been logged. See the following table for their descriptions, triggers and actions to be taken. DIAGNOSTIC CODES Diag Description Trigger Code The water level failed to drop 1 No Drain below the low water level in a final spin. The door Door failed to 2 fails to unlock after 11 unlock attempts. Continuous fill of 12 minutes 3 No fill or total fill of 14 minutes. Door failed to The door lock after 11 4 fails to lock attempts. Continuous unbalance Unbalance 5 circuit circuit is always (During Spin open. only). Motor did not turn after 10 6 Locked rotor consecutive retry attempts. 1 16025823 Action to be Taken Go to “Will Not Drain”, page 4. Go to “Will Not Unlock”, page 4 Go to “No Water Fill”, page 3. Go To “Will Not Lock”, page 3. Go to “Wet Clothes”, page 3. (See unbalance harness connections) Go to “Motor Drive System Test”. December 2004 ©2004 Maytag Services complete wash 2. Motor tach Motor over signal detected Replace Motor speed at maximum Control Board speed. key is assumed to be stuck.Clear the Door lock diagnostic code. Action to be Taken Check heater and sump thermistor for continuity. Unlock”. unless testing requires it. Abnormally Check harness Sump high/low connections. personal injury. replace Machine Control Board. possible line signal exists exists without noise issue. To avoid risk of electrical shock. detected. Unlock Conditions for Go to “Will Not problem unlock not met. Lock Test”. Go to “Door open with cycle. Was heater on with no water fill? Trigger Action to be Taken Temperature rise not Heater not detected when 7 heating heater was on for 10 minutes. perceived as continuity. 2. cycle. 22 Non-volatile Difficulty in 11 memory reading error memory 23 12-14 (Not Used) A key is sensed to be pressed for more than Replace Membrane 15 Stuck key 75 seconds. or death. Clear diagnostic Motor tach Tach signal codes. page 6 1. Go to “Door cycle. Unplug and reconnect power cord at power supply outlet. page 3 motor maximum torque. Customer may have tried to The door has repeat wash cycle not been without opening opened after a door. Control Board (Not Used) Abnormal Go to “Wrong Valve high/low Water thermistor temperature or Temperature”. Go to “No Fill Test”. Speed never exceeded 500 RPM during a High speed main wash not achieved cycle. replace Motor running. motor command. failure ohm resistance page 4 detected. page 3 1.Diagnostic Codes ! Diag Description Code Trigger WARNING Diag Description Code Door actuator switch was 17 not detected open since the final spin. If without torque problem persists. torque for extended period. Door lock switch is recheck. page 6 18 19-21 Go to “Wet Clothes”. detected detected as open during 2. page motor running 6 (Not Used) Door switch is detected as Check harness Door switch open and the connections at door detected door lock open/closed switch open during switch is and for switch cycle. If condition still exists. locked. check thermistor temperature or continuity of sump failure ohm resistance themistor. Go to “Wet 16 due to high Experienced Clothes”. page 4 cycle. 9 (Not Used) Did not reach Low RPM 500 RPM due 10 unbalanced to an load unbalanced load. the switch. Door is Door lock is locked at locked and user Go to “Will not start of tries to start a Unlock”. The low water level is not satisfied before Water the high water 8 sensor level level contacts fault are opened in the pressure switch. disconnect power to washer before servicing. December 2004 ©2004 Maytag Services 16025823 2 . 24 25 26-27 28 29 62 1. Lock Test”. personal injury. • Fabric cycles such as DELICATES and HAND WASH only tumble for a few seconds every 30 seconds.Troubleshooting ! WARNING • • • Check that the leveling leg lock nuts are tightened. No Water Fill • Check to make sure water supply is fully turned on. The non-listed codes are insignificant codes. Normal water level is only 2. Motor Control Board and Motor. . • Check for restricted drain system. Run Quick Spin Test to check unbalance switches and Control Board. Check for proper spring placement of outer tub support springs. Check for rubber gasket damage due to over tightening. • Perform “Motor Drive System Test”. • Washer does not tumble during some drains and rinse fills. resulting in lower spin speeds. • Make sure end of drain hose is correctly inserted and secured to drain facility.5 to 5 inches inside and toward the rear of the spinner. • Check for loose lower front weight • Verify rubber feet are installed on leveling legs. Check strut operation. disconnect power to washer before servicing. • Use high efficiency or low sudsing detergent specially formulated for front load washers. December 2004 ©2004 Maytag Services 3 16025823 • Tub is completely full of suds • Run the clothes washer through another complete cycle using cold water and no more detergent. To avoid risk of electrical shock. • Check unbalance harness connections at all switches and at main harness connection on top of Outer Tub Assembly for connectivity. • Perform “Motor Drive System Test”. disregard these codes. • Perform “No Fill Test” page 6. Perform “Door Lock Test”. • Check to see if belt is off motor and pulley. or death. Note: If any “unused codes” appear on the screen. • Check for loose connections at Machine Control Board. Add additional towels. • Check for loose wire connections at Control Board and Drain Pump. • Check electrical connections at lock assembly and Machine Control Board. • Perform “Motor Drive System Test”. Remove. • Avoid overloading which can push the door partially open. • Check for kinks in inlet hoses. Will Not Lock • Check to see if the door is closed. Seal seam must be at the top of the tub cover. No Tumble • Washer does not tumble for the first 30 seconds after the door has been opened for safety purposes. Display Lights Up When Door Opened • This is normal behavior. unless testing requires it. Wet Clothes • Very small clothes loads can cause unbalances. • Check for clogged inlet screens. If complaint is a high-pitched noise during fill then disconnect supply hoses and clean screens. Noisy • Clothes washer should be leveled properly as outlined in installation instructions. • Reduce detergent amount in the future for that specific load size and soil level. • Weak floors can cause vibration and walking. reposition and reinstall the tub cover seal. TROUBLESHOOTING THE SYMPTOMS Leaking • Make sure supply hose connections are not leaking. Check for diagnostic code 16. Towel loads have a minimal amount of soil present and typically create more suds. • Check for restricted drain system. • Excessive suds may have been present. • Visually check hot and cold separately at dispenser for proper flows. • Inertial Unbalance Switch tripped too soon. This is normal. • Check internal hose connections • Check tub cover. disconnect power to washer before servicing. or death. This may appear to be significantly warmer/cooler than expected. • Check for restricted drain system. Also check water heater capacity and recovery rate. Advance To Next Step Selecting “advance to next step” button advances the cycle to the next step in the cycle. touch the button “service cycle“ to begin the Service Cycle. then cancel the wash cycle. • Check to see if the washer is in a pause or soak period in the cycle. Flush water line before filling washer. December 2004 ©2004 Maytag Services . Initiating a Service Cycle: If the washer is not operating in a wash cycle. • Check fuse or reset circuit breaker. • Check low and high water levels. Will Not Unlock • Unplug and reconnect the power cord. To avoid risk of electrical shock. and start the washer in the Service Cycle. If not resolved. If the fill hoses on the washer were previously installed 16025823 4 User Interface Tests This test will check the touch screen and the membrane pad. Wrong Water Temperature • Too Hot/Too Cold. (See Board Input/Output Chart. water line may need to be purged prior to starting wash cycle. During a wash cycle: Press the “service cycle” button. The technician will be prompted what to do. Perform “No Fill Test” • Check for 120 VAC at the pump when a spin cycle is selected. Push the “start/pause” button to start the clothes washer.since this product uses a low amount of water. pages 7-8). If the washer is running during Service Cycle the screen will display the various inputs and outputs of the washer. • Check for loose electrical connections at door lock and at Machine Control Board. Wait 2 minutes to see if machine unlocks. • This washer can sense if the fill hoses have been reversed between hot and cold. Service Cycle The Service Cycle is used to run a quick cycle that performs all of the normal wash cycle functions. the board regulates the incoming flow to temper the actual temperature of the water in the tub. • If the water heater is located a long distance from washer. check for proper resistance on the water valve thermistor. pages 7-8). Diagnostic Tests Touching any of the screens on the washer control panel will initiate the corresponding test. • Check to make sure belt has not fallen off. • Perform “Motor Drive System Test”. Wait briefly for cycle to change. unless testing requires it. the washer will need to run through a Hot / Cold cycle. • Are both faucets turned ON fully? • Make sure temperature selection is correct. • Check the owner’s water heater. • Check for door locked switch circuit to be closed at Machine Control. System Check (See System Check) will allow you to perform system checks of the various inputs and outputs of the washer. • Push the “off” button then open and close the door. Will Not Drain • Check for restricted drain system. • Make sure hoses are connected to correct faucets and inlet connections. personal injury. It should be set to deliver a minimum 120°F (49°C) hot water at the tap.Troubleshooting ! WARNING incorrectly and then corrected. • Disconnect inlet hoses and clean screens. Will Not Start • Plug cord into live electrical outlet. (See Board Input/Output Chart. disconnect power to washer before servicing. Reconnect the washer power cord to supply voltage. 5. and the spinner rotates at the proper RPM: the problem lies outside of the motor and Motor Control Circuit. unless testing requires it. or death. Verify 120VAC at L1 and N connection at Motor Control Board. Press and hold the “help” and “back” keys for 3 seconds to start the Service Mode.” returns you to the Service Tests screen. “cancel & exit quick spin test. 9. by touching the “hold at this step” button. 13. December 2004 ©2004 Maytag Services 5 16025823 . Check loose electrical connections at Machine Control Board or broken wires in harness. Disconnect power to the washer. Select “system check”. Motor & Motor Control Test 1. select “quick spin test” button. 4. Motor Drive System Test Perform a Motor and Motor Control Test. 14. but the spinner does not rotate: Check for missing belt. 11. 16. Check door actuator switch and related wiring. 2. If the motor runs. 7. touch “toggle motor control on”. If voltage is not present. 3. 15. Any of the steps in this test can be held or paused up to 30 minutes. Check for loose electrical connections at motor. rotating the spinner at 50 rpm. If the motor runs. If voltage is present. The Motor Control will immediately execute a test routine and the motor should run. and Motor Control Board. personal injury. then problem lies with the motor and Motor Control System. Check phase windings of the motor. replace the Motor Control Board. If motor windings are good. 8.Troubleshooting ! Quick Spin Test To begin test. Remove the front panel and pull the JP4 Connector from the Motor Control Board. Disconnect power to the washer and reconnect the JP4 Interface connector to the Motor Control. 10. 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” WARNING To avoid risk of electrical shock. 12. 6. personal injury. Obtain access to the Water Valve. . Does the door lock? 2. check or replace the wire harness. If less than 60VAC. check the ColdWater Valve for 120VAC between the BU and WH wires. Does the door unlock? 2. 8. 2. verify the Door Lock/Unlock solenoid harness connections are not loose and wiring is correct. Go to page 4. check or replace the wire harness. 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. close the door and enter “service mode” (press “help” and “back” for 3 16025823 6 11. Press “off”. If voltage is not present at the Pressure Switch. unless testing requires it. and Control Board for voltage checks by raising the Top Cover and loosening the Console now. 4. No Fill Test 1. or death. There should be continuity. If water is drained out. verify the Door Lock/Unlock solenoid harness connections are not loose and wiring is correct. Make sure the door is closed. Note: The relay on the Control Board for the door unlock mechanism is disabled if the Motor Control Board indicates the spinner speed is > 7 RPM. If cold water flows. Close the door and start a “spin cycle” to drain all water from the washer to reset the Pressure Switch. check the continuity at the Pressure Switch between the GY and YL wires. If no continuity. Remove the hoses and clean out any debris from both ends and the hot and cold water valves. replace the Control Board. Press “off” and open the door to verify that all water is removed from the washer. If more than 2VDC. If the low water level is shown as empty. then turn the drain off. turn the Cold Water Valve on by pressing the “toggle cold” button. If no voltage is present at the Control Board. If 120VAC is present at the Control Board. check the low water level input at the Control Board connector by reading the DC voltage between P3(5) and P3(3). 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. If it is not flowing. Door Lock Test 1. 3. Verify that cold water is flowing in the dispenser. disconnect power to washer before servicing. check the high water level input at the Control Board connector by reading the AC voltage between P1(8) and P8(2). Enter the System Check mode by pressing the appropriate button on the touch panel. check the voltage at the Pressure Switch between the BU and the BR wires. 12. Turn the Hot Water Valve on by pressing the December 2004 ©2004 Maytag Services To avoid risk of electrical shock. check or replace the wire harness. replace the Control Board. Start a “system check cycle”. replace the Control Board.Troubleshooting ! Door Lock/Unlock Test WARNING seconds). Drain all of the water out of the washer by pressing the “toggle drain” button until drained. turn the cold valve off by pressing the “toggle cold” button. If 120VAC is not present at the Control Board. There should be continuity. check for 120VAC at the Control Board between P1(4) and P8(2). If there is continuity. verify that the door is sensed closed. 7. If the high level is full. replace the Pressure Switch. If the low level is full. Verify that the low water level is empty ("wash level (low) empty"). The Control Board cannot sense the high water level with the door open. If the high water level is shown as empty. If 120VAC is not present at the cold valve. 5. replace the Pressure Switch. Verify that the high water level is empty ("rinse level (high) empty"). 9. 6. If more than 2VDC. The door should lock when System Check mode is entered. If more than 60VAC is present at the Control Board. Door Unlock Test 1. Verify that the cold and hot water supplies at the faucet are turned on and can supply water. Pressure Switch. If water is still present. 10. check the Hot Water Valve for 120VAC between the OR and WH wires. If 120VAC is not present at the hot valve.Troubleshooting ! WARNING To avoid risk of electrical shock.input Hot water valve output December 2004 ©2004 Maytag Services 7 16025823 Conn/ Reference Pin To Conn/ Voltage Comments Number Pin Number P1(5) P1(4) P1 (1) P3 (8) P8 (1) P8 (3) P6 (4) P6 (1) P1 (8) P1 (3) P8(2) P8(2) P8 (2) P2 (3) P8 (2) P8 (2) P8 (2) P8 (1) P8 (2) P8 (2) 120 VAC 120 VAC 120 VAC 24VDC 120 VAC 120 VAC 120 VAC 120 VAC 120 VAC 120 VAC 500-1K ohms 60 millisecond pulse Screen with the washer not in a wash cycle: Locked. disconnect power to washer before servicing. If hot water flows. personal injury. Screen with washer in a wash cycle: The MAH7500 Machine Control Boards low voltage DC outputs are isolated from the 120V circuitry. replace the Control Board. 24VDC Closed. check or replace the wire harness. “toggle hot” button. Verify that hot water is flowing in the dispenser. Machine Control Board Input/Outputs LCD Washer Control Board When testing any 24 VDC circuit you must use connection P2 (3) As a neutral reference. Board Input/Output Chart Descr. the following screen will display and allow the technician to toggle various components On/Off. If 120VAC is present at the Control Board. turn the hot valve off by pressing the “toggle hot” button. 120VAC 60 millisecond pulse 500-1K ohms . If it is not flowing. unless testing requires it. System Check System Checks can be initiated at any time. If 120VAC is not present at the Control Board. Neutral from the incoming line cannot be used to achieve a valid 24VDC reading. or death. Bleach water valve output Cold water valve output Door Lock output Door Lock switch input Door switch input Door Unlock output Drain pump output HeaterNeutral High water level . check for 120VAC at the Control Board between P1(3) and P8(2). If the washer is not in a wash cycle. There should be <100 ohms present when the pad is pressed. by pulling the P7 connector from the Machine Control Board and locating the corresponding switch pin numbers in the ribbon harness. disconnect power to washer before servicing. 24VDC 120 VAC 1-5VDC Dependent on temperature Descr.Troubleshooting ! WARNING To avoid risk of electrical shock. Conn/ Reference Pin To Conn/ Voltage Comments Number Pin Number P6 (2) P6 (3) P3 (5) P2 (1) P8 (2) P3 (2) P1 (6) P5(3) P2(2) P3(6) P2 (3) P8 (2) P5(4) P2(3) P3(7) P8 (2) P8 (2) P2 (3) P2 (3) 120 VAC 120 VAC 24VDC 24VDC Neutral No unbalance 24VDC condition. 24VDC Torque PWM Water valve thermistor 24VDC 1-5VDC NTC MEMBRANE PAD CHECKS Check the Membrane Pad.input Motor control tach Neutral (120 VAC) Unbalance input Softener water valve Sump Heater Thermistor Empty. L1 to machine control board L1 to motor control Lower water level . or death. Membrane Pad home favorites back start/pause off help Pin Number P7 (3) P7 (4) P7 (3) P7 (3) P7 (4) P7 (4) Pin Number P7 (5) P7 (5) P7 (6) P7 (7) P7 (7) P7 (6) 16025823 8 December 2004 ©2004 Maytag Services . personal injury. unless testing requires it. Opening of Unbalance Switches at speed >850 rpm and during a final spin. non-critical condition. or death. Opening of Unbalance Switches at speed <500 rpm and >100 rpm during a spin. Locked rotor condition during a spin (Not Used) Motor on at full power for 30 seconds at >850 rpm. Informative only. (Not Used) Low water level contacts of Pressure Switch not seen as resetting at end of drain cycle. Check pump for proper function. 9 10 11 12 Locked rotor condition during a spin. unless testing requires it. Too much power at speed >850 rpm Low Speed Unbalance Detected. Action To Be Taken Informative only. Inlet hoses reversed at the faucets for Hot and Cold. Check for restricted drain system. May see diagnostic code 01.Troubleshooting ! HELP CODE TABLES Help Code Description Plaster Unbalance Load Detected. 13 High Speed Unbalance Detected 14 Unbalance load condition existed during initial ramp up of spin cycle. Informative only. Water Valve Thermistor readings are contrary to what is being demanded by washer Control Board. non-critical condition 2-6 Slow drain 7 One locked rotor 8 Fill hoses are reversed. During startup. the Spinner did not reach 10 rpm within 2 sec. December 2004 ©2004 Maytag Services 9 16025823 . kinked/plugged drain hose or pump. Informative only. non-critical condition. non-critical condition. Informative only. Resulted in redistribution cycle. disconnect power to washer before servicing. (During Wash/Tumble). 1 Trigger WARNING To avoid risk of electrical shock. Informative only. non-critical condition. non-critical condition. personal injury. Motor 10 33 Too much power at start of spin. Too much detergent. (Not Used) Control Board detects motor torque dropping. Motor Control Board (JP4 connector) and Machine Control Board connections. 35 Too much power during Wash/Tumble. non-HE detergent with suds suppressor being used. 34 Maximum torque requested in Spin Less Than 110 RPM. or death. Too much detergent. Too Much Power At 550 . for example during the spin cycle. Perform Motor Drive System Test. Opening of Unbalance Switches at speed >500 RPM and during a final spin. Possible slow drain scenario present or customer interrupted wash cycle and started washer over again. 20 Fast fill 21 22 23 2429 Excessive Suds Detected During Wash/Tumble.Troubleshooting ! 15 Spin suds lock WARNING To avoid risk of electrical shock.850 rpm. 16025823 December 2004 ©2004 Maytag Services . disconnect power to washer before servicing. Perform Motor Drive System Test. non-HE detergent with suds suppressor being used. then pressing “start/pause” key will resume cycle and clear the "PF" display. Perform connections at Motor. (Not Used) Suds lock. Check wire harness. Check for Diagnostic Code 08. (Not Used) Fill level reached within 2 seconds of fill initiation. washing clothes with minimal amount of soils present with normal measure amount of detergent. (Not Used) Motor on at full Informative Only power too long between 550 850 rpm. washing clothes with minimal amount of soils present with normal measure amount of detergent. 16 High speed unbalance detected. Maximum torque requested in Wash/Tumble. full power given to motor by Motor Control Board for 1 second within a spin at less than 500 RPM. 17 Informative Only 18 Power down 19 Will indicate power failure until a key is pressed. personal injury. (Not Used) Loss of power. If a cycle was in process prior to loss of power. Check wire harness connections at Motor. unless testing requires it. Cycle was paused due to failure to verify Tach Signal during unlock request. Refer to Diagnostic code 62 Motor Control Not Powered During Unlock. Informative only December 2004 ©2004 Maytag Services 11 16025823 . Informative only. 43 Informative only. Motor running during tumble for too long. Perform Motor Drive System Test. Check wire harness. Refer to Diagnostic code 62 Tach Signal unexpectedly present during unlock.Troubleshooting ! WARNING Control Board (JP4 connector) and Machine Control Board connections. Perform connections at Motor. Refer to Diagnostic code 02 45 46 Door locked when not expected. Motor Control Board (JP4 connector) and Machine Control Board connections. 1 minute after Informative only start of tumble. unless testing requires it. Cycle was paused because the Tach occurred when the Motor Control was powered during unlock request. 37 3839 Motor still running after 240 seconds of coast down after a spin. No Tach Signal observed when Motor Control is powered at the end of the failed fast power up and unlock retries. disconnect power to washer before servicing. 36 Motor still running after 240 seconds of coast down after a spin. if speed is > 85 RPM. 40 41 Loss of Tach Signal during door unlock sequence. Informative only To avoid risk of electrical shock. or death. Cycle was paused because Motor Control not powered during unlock request. 42 Informative only. Refer to Diagnostic code 62 44 Unlocking attempts disallowed because Tach Signal continues after Tach verification. Informative only. Check Door Lock Switch for welded contacts. personal injury. Cabinet impact sensed. (Not Used) Motor running >85 RPM and the door is not locked. Cabinet impact detected by the frame vibration The door Is not locked while spinning. unless testing requires it. personal injury. 48 Informative Only 16025823 12 December 2004 ©2004 Maytag Services . WARNING To avoid risk of electrical shock. The Door Lock Switch did not go from unlocked to locked when the door lock output was energized.Troubleshooting ! Door did not lock after the first try. Informative Only Door did not unlock after the first try. or death. disconnect power to washer before servicing. The Door Lock Switch did not go from locked to unlocked when the door unlock output was energized. 47 sensor. disconnect power to washer before servicing. personal injury. or death. unless testing requires it. December 2004 ©2004 Maytag Services 13 16025823 .Wiring Diagram ! WARNING To avoid risk of electrical shock.