Whirlpool WFW9750WL02 Parts Diagram

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IAGNOSTIC GUIDE

Before servicing, run diagnostic test first, then check the following:

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Make sure there is power at the wall outlet.

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Has a household fuse blown or circuit breaker tripped? Time delay fuse?

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Are both hot and cold water faucets open and water supply hoses unobstructed?

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All tests/checks should be made with a VOM or DVM having a sensitivity of 20,000 Ω per volt DC or greater.

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IMPORTANT

Electrostatic Discharge (ESD)

Sensitive Electronics

ESD problems are present everywhere. ESD may damage or weaken the electronic control assembly. The new control assembly may appear to work well after repair is finished, but failure may occur at a later date due to ESD stress.

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Use an anti-static wrist strap. Connect wrist strap to green ground connection point or unpainted metal in the appliance.

-OR-

Check all connections before replacing components. Look for broken or loose wires, failed terminals, or wires not pressed into

onnections far enough.

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A potential cause of a control not functioning is corrosion on connections. Observe connections and check for continuity with an ohmmeter.

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Connectors: Look at top of connector. Check for broken or loose wires. Check for wires not pressed into connector far enough to engage metal barbs.

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Resistance checks must be made with power cord unplugged from outlet, and with wiring harness or connectors disconnected.

Touch your finger repeatedly to a green ground connection point or unpainted metal in the appliance.

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Before removing the part from its package, touch the antistatic bag to a green ground connection point or unpainted metal in the appliance.

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Avoid touching electronic parts or terminal contacts; handle electronic control assembly by edges only.

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When repackaging failed electronic control assembly in antistatic bag, observe above instructions.

TROUBLESHOOTING GUIDE

PROBLEM POSSIBLE CAUSE/TEST

LEAKING • Make sure supply hose connections are not leaking.Check for rubber gasket damage due to overtightening.

• Make sure end of drain hose is correctly inserted and secured to drain facility.

• Avoid overloading the washer, which can push the door partially open.

• Check internal hose connections.

• Check the bellows.Remove, reposition, and reinstall the bellows. Make sure the bellows is not wrinkled.

NO WATER FILL • Make sure the water supply is turned on fully.

• Normal water level is only 2.5 to 5 inches (64 mm to 127 mm) inside the tub.

• Check for kinks in inlet hoses.

• Check for clogged inlet screens.

• Visually check hot and cold water flow separately at the dispenser.

NOISY • Washer should be leveled properly as outlined in the Installation Instructions.

• Weak floors can cause vibration and walking of the washer.

• Check for loose lower front bracket.

• Be sure rubber feet are installed on the leveling legs.

• Make sure that the leveling leg lock nuts are tightened.

• High-pitched noise during fill may be due to clogged inlet screens. Disconnect the supply hoses and clean the inlet screens.

• Check for proper placement of outer tub support springs.

• Confirm proper damper operation.

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ROUBLESHOOTING GUIDE

PROBLEM POSSIBLE CAUSE/TEST

TUB IS COMPLETELY FULL OF SUDS • Run the washer through another complete cycle using cold water and no more detergent.

• Reduce the amount of detergent for that specific load size and soil level.

• Loads of towels 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 pump.

• Check to see if the belt fell off the motor and pulley.

• Perform the Continuity Test, page 7.

WETCLOTHES • Single or tangled items can cause unbalances – add additional towels or redistribute items in drum.

• Excessive suds may have been present.Check for diagnostic code “Sud”.

• Check connections at all switches and at the washer control board.

• Check for restricted drain system.

• Perform the Continuity Test, page 7.

DOOR WILL NOT LOCK • Door is not completely closed.

• Check the electrical connectors and check coils for continuity at the lock assembly and at the washer control board.

• Check if the door switch is closed. If the door switch is electrically open when the door is mechanically closed, the door will not lock.

DOOR WILL NOT UNLOCK • Unplug and reconnect the power cord.Wait 2 minutes to see if the washer door unlocks.

• Make sure the door locked switch circuit is closed at the machine control.

• Make sure the belt has not fallen off.

• Check for loose electrical connections at the door lock assembly and at the washer control board.

• Perform the Continuity Test, page 7.

WASHER WILLNOT START • Make sure the power cord is plugged into a live electrical outlet.

• Make sure that fuse or circuit breaker are not blown; replace or reset if necessary.

• Close the door and push the START button to start the washer. The LED should change from flashing to continuously on.

• The washer may be in a pause or soak period of a cycle.Wait briefly for the washer to start.

• Check for restricted drain system.

WASHER WILL NOT DRAIN • Check for restricted drain system.

• Check low and high water levels.

• Check for 120 VAC at the drain pump when a spin cycle is selected.

WRONG WATER TEMPERATURE • Since this washer uses a low amount of water, the control board regulates the incoming water flow to temper the

actual temperature of the water in the tub, which may be warmer or cooler than expected.

• Make sure both faucets are turned on fully.

• Make sure the temperature selection is correct.

• Make sure the inlet hoses are connected to the correct faucets and inlet connections. Flush the water line before filling the washer.

• Check the water heater to be sure it is delivering water at a minimum 120°F(49°C) at the tap.Check the water heater capacity and recovery rate.

• If the water heater is located a longdistance from the washer, the water line may need to be purgedprior to starting a wash cycle.

• Check for kinked inlet hoses or clogged inlet screens.

• This washer can sense if the fill hoses are installed incorrectly (reversed between hot and cold). If the fill hoses were previously installed incorrectly and then corrected,the washer will need to run through a Hot/Cold cycle. If the water temperature still seems incorrect, check for proper resistance on the water valve thermistor.

• Make sure the heating element is functional. Check for condensation on water temperature sensor connector.

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AILURE/ERROR DISPLAY CODES

Failure codes will be displayed in the Estimated Time Remaining display of the washer console.

ISPLAY EXPLANATION AND RECOMMENDED PROCEDURE

EPROM ERROR

A communication error between the Central Control Unit (CCU) and the EEPROM onboard the CCU occurred.

ossible Causes/Procedure

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A power glitch may cause this error. – Unplug washer or disconnect power for two

minutes. The washer should operate on its own dedicated

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circuit. If operating on a common circuit, it may be receiving line noise from other appliances.

– Check CCU operation by running same cycle with

same loads in which the failure was observed.

MAIN RELAYS ERROR

One of the main relays is not working properly.

Possible Causes/Procedure

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The relay might be welded. – Replace CCU board.

STEAMER DEFECT

This failure is for information only and can be displayed in the error history during the Diagnostic Test. During a wash cycle,the steamer temperature has not reached the correct value. For this cycle the heater element is used instead of the steamer to reach the required temperature.

Possible Causes/Procedure

1. Unplug washer or disconnect power.

2. Check connection to heater steam generator.

3. Check resistance of heater steam generator (bad heater = infinity or zero).

4. Check the steam temperature sensor and the connection to it. Refer to the Temperature Sensor section, page 7.

MOTOR CONTROL UNIT ERROR

The Motor Control Unit has internal failure, repeating under or over voltage, or over current conditions. Can also be caused by a momentary loss of neutral feed to the MCU during the spin cycle.If failure occurs during high-speed spin, the door unlocks after 3 minutes.

Possible Causes/Procedure

1. Unplug washer or disconnect power.

2. Check wire harness connections between the drive motor and the Motor Control Unit (MCU), and between the MCU and the Central Control Unit (CCU). Check the motor and do a continuity test.

3. Plug in washer or reconnect power.

4. Run a Diagnostic Test and run the motor. If it does not run, replace the MCU board.

ISPLAY EXPLANATION AND RECOMMENDED PROCEDURE

O WATER DETECTED ENTERING

N MACHINE OR PRESSURE SWITCH TRIP NOT DETECTED

If, after 30 seconds during Diagnostic Test, less than

3.3 oz (0.1 L) of water has entered the machine, or if uring a cycle, the maximum fill time of 13 minutes is

d exceeded, the valves will be turned off and the error code will be displayed. Press PAUSE/CANCEL twice to clear the display.

Possible Causes/Procedure

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If there is no water in the unit: – Make sure that both valves at the water source(s)

are turned on all the way.

– Check for plugged or kinked inlet hoses

or plugged screens in the inlet valves.

– Verify inlet valve operation.

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If there is water in the unit: – Verify that the pressure switch hose is in good

condition and properly connected to tub and pressure switch.

1. Unplug washer or disconnect power.

2. Verify there is not a siphon problem.

3. Verify wire harness connections to inlet valves,

pressure switch, and Central Control Unit (CCU).

4. Check all hoses for possible leaks.

5. Plug in washer or reconnect power.

6. Verify pressure switch operation (run diagnostic test).

7. Verify CCU operation by running a DiagnosticTest

or any cycle.

LONG DRAIN

If the drain time exceeds eight minutes,“F21” will be displayed, the water valves will turn off, and the pump will stop running. Press PAUSE/CANCEL to drain the machine. The display will be cleared and the machine will turn off after a maximum of eight minutes.

Possible Causes/Procedure

1. Check the drain hose and make sure it is not

plugged or kinked.

2. Unplug washer or disconnect power.

3. Check the drain pump filter for foreign objects, and

also make sure the hose from the tub to the pump is not plugged or kinked.

4. Check the electrical connections at the pump

and make sure the pump is running.

5. Plug in washer or reconnect power.

6. If the above does not correct the problem,

go to step 7.

7. Unplug washer or disconnect power.

8. Replace the pump.

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ISPLAY EXPLANATION AND RECOMMENDED PROCEDURE

OOR LOCK ERROR

Indicated during Diagnostic Test only. During the start of a cycle, the appliance goes to pause mode.A Door Lock Error occurs if the door cannot be locked.It will try to lock it six times before displaying the error code.

Possible Causes/Procedure

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Door lock mechanism is broken or removed from door.

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Door switch/lock unit failure.

1. Unplug washer or disconnect power.

2. Check door switch/lock unit.

3. Check the wire harness connections to the door switch/lock unit and Central Control Unit (CCU).

WATER TEMPERATURE SENSOR ERROR

If the water temperature sensor (NTC) value is out of range (23°F to 217°F [-5°C to 103°C]) during the water-heating step of the WASH cycle.

NOTE: To find correct Ohm reading, refer to the Temperature Sensor section,page 7.

Possible Causes/Procedure

1. Unplug washer or disconnect power.

2. Check the water temperature sensor and the connection to it, and also check for condensation.

3. Refer to the Temperature Sensor section,page 7.

DRIVE MOTOR TACHOMETER ERROR

If the control is unable to properly detect motor speed, the machine shuts down. If a failure occurs during high-speed spin, the door unlocks after 3 minutes.

Possible Causes/Procedure

1. Verify that the shipping system, including shipping bolts, spacers, and the power cord, are removed.

2. Unplug washer or disconnect power.

3. Check drive motor tachometer resistance. It should be approx. 115 Ω. (See wiring diagram)

4. Check wire harness connections between the drive motor and the Motor Control Unit (MCU), and between the MCU and the Central Control Unit (CCU).

5. Plug in washer or reconnect power.

6. Check the MCU by looking for operations of the drive motor.

7. Check the drive motor for powered rotations.

ISPLAY EXPLANATION AND RECOMMENDED PROCEDURE

DOOR SWITCH ERROR

Indicated during Diagnostic Test only. During normal operation,the buzzer beeps three times. If the door has not been opened for 3 consecutive cycles or the door

witch is open while the door is locked for more than

s 5 seconds.

Possible Causes/Procedure

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Door not opened during 3 consecutive cycles.

. Open and close the door.

2. Verify CCU operation by running a Diagnostic Test or any cycle.

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Door switch open while door is locked.

1. Push the door and check if it is completely closed.

2. Verify CCU operation by running a Diagnostic Test or any cycle.

3. Check door switch contacts.

4. The resistance of both door coils (between pin 1 and pin 3) should be approx. 320 Ω.

OVERFLOW CONDITION

If there is too much water or foam in the machine, the overflow contact on the pressure switch is closed. If the valves are open, they automatically close and the drain pump switches on for at least 30 seconds. If overflow occurs 5 times, the error code is displayed and the pump drains the machine.To unlock the door, press PAUSE/CANCEL.

Possible Causes/Procedure

1. Check the inlet valve for proper shut off.

2. Check the drain hose and make sure it is not plugged or kinked.

3. Unplug washer or disconnect power.

4. Check wire harness connections to the drain pump, pressure switch, water inlet valve, and Central Control Unit (CCU).

5. Check/clean drain pump filter of foreign objects.

6. Check for drain pump failure.

7. Check thepressure switch byrunning a DiagnosticTest.

SERIAL COMMUNICATION ERROR

The communication betweenthe Central Control Unit (CCU) and the MotorControl Unit (MCU)cannot be sentcorrectly.

Possible Causes/Procedure

1. Unplug washer or disconnect power.

2. Check wire harness connections to the MCU, the motor, and Central Control Unit (CCU).

– Check connections of the CCU board within

the housing.

– Make sure all grounding switches are engaged.

3. Check that the serial harness at the MCU is not mounted upside down.The wires should be to the left when facing the MCU connectors.

4. Check the drive system for any worn or failed components.

5. Plug in washer or reconnect power.

6. Verify CCU operation by running a Diagnostic Test or any cycle.

7. Check door switch system. (See checklist for F26 and F29). The door switch may cause interference for the power supply of the MCU.

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ISPLAY EXPLANATION AND RECOMMENDED PROCEDURE

OOR UNLOCK ERROR

Indicated during Diagnostic Test only. During the start of a cycle, the appliance goes to pause mode. If the door unlock has failed 6 times.

Possible Causes/Procedure

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Foreign objects in door switch/lock unit.

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Door lock mechanism is broken.

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Door switch/lock unit failure.

1. Check door switch/lock unit for foreign objects.

2. Unplug washer or disconnect power.

3. Check the wire harness connections to the door witch/lock unit and Central Control Unit (CCU).

4. Check door switch contacts.

5. The resistance of both door coils (between pin 1

and 3) should be approx. 320 Ω.

NOTE: The door switch/lock unit can be manually unlocked. See Manually Unlocking the Door Lock System, page 7.

DISPENSER SYSTEM ERROR

When the dispenser motor cannot be driven to its proper position.

Possible Causes/Procedure

1. Unplug washer or disconnect power.

2. Check mechanical linkage from dispenser motor

to the top of the dispenser.

3. Check the wire harness connections to the

dispenser motor and Central Control Unit (CCU).

4. Check dispenser motor for powered rotations.

MOTOR CONTROL UNIT FAILURE

If the heat sink gets too hot, the Motor Control Unit (MCU) will stop the motor, the MCU will communicate this failure to the Central Control Unit (CCU), then the CCU will reset the MCU. If the condition continues four times, the F31 code will show.

Possible Causes/Procedure

1. Check for proper installation, verify the unit is

not located near a source of heat and has proper ventilation.

2. Unplug washer or disconnect power.

3. Check the wire harness connections to the MCU,

the motor, and Central Control Unit (CCU).

4. Check the drive system for any worn or failed

components.

5. Plug in washer or reconnect power.

6. Check the MCU by looking for operations of the

drive motor.

7. Check the drive motor for powered rotations.

PRESSURE SWITCH FAILURE

If there is no electrical supply to the Pressure Switch from the CCU or if the Pressure Switch contacts are worn out, then a Pressure Switch Failure is displayed.

Possible Causes/Procedure

1. Check Pressure Switch harness for continuity.

2. Check Pressure Switch and run a Diagnostic Test.

ISPLAY EXPLANATION AND RECOMMENDED PROCEDURE

NLOAD INDICATION

This failure is only for information and can be displayed in the error history during the Diagnostic Test. During the Cleaning Cycle, a load was detected inside the drum and Cleaning Cycle was interrupted by indicating “rL” to User. Run cleaning cycle to verify“rL” problem.

ANALOG PRESSURE SENSOR FAILURE

If this failure is displayed, the Central Control Unit has detected a malfunction of the analog pressure sensor.

Possible Causes/Procedure

1. Check if pressure hose is fixed correctly and without holes or damage.

2. Make sure that the airtrap is not blocked.

3. Make sure that the hose is not blocked and no water is inside.

STEAMER INLET VALVE FAILURE

This failure can be displayed only during the Diagnostic Test. The steamer valve is blocked open or not working properly.

Possible Causes/Procedure

1. Check the valve for continuity (abnormal = infinity); normal operation resistance = approx. 812 Ω.

2. Check the connections between the CCU and the valve for steam fill.

3. Confirm the water supply to the tub (see F20).

STEAM TEMPERATURE SENSOR ERROR

This failure can be displayed only during the Diagnostic Test. If the steam temperature sensor (NTC) value is out of range (14°F to 230°F [–10°C to 110°C]), the failure is displayed. During the Wash cycle, the water heating step is skipped. NOTE: To find the correct Ohm reading, refer to theTemperature Sensor section, page 7.

Possible Causes/Procedure

1. Unplug washer or disconnect power.

2. Check the water temperature sensor and the connection to it. Refer to the Temperature Sensor section, page 7.

CENTRAL CONTROL UNIT HEARTBEAT FAILURE

If a Central Control Unit Heartbeat Failure is displayed, no communication is detected from the Central Control Unit (CCU) to the User Interface.

Possible Causes/Procedure

1. Check for continuity of the User Interface harness.

2. Check wire harness connections to the User Interface and Central Control Unit.

3. If the drum is not rotating, unplug the MCU from the CCU (the MI3 or M13 connector). If the code goes away,then replace the MCU. If the code does not go away,replace the CCU.

4. Replace User Interface if drum is rotating.

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