Whirlpool CHW9050 Service Manual page 94

FOR SERVICE TECHNICIAN ONLY - DO NOT REMOVE OR DESTROY FOR SERVICE TECHNICIAN ONLY - DO NOT REMOVE OR DESTROY
WASHER WASHER
DISPLAY DISPLAY EXPLANATION AND RECOMMENDED PROCEDURE EXPLANATION AND RECOMMENDED PROCEDURE
OVERFLOW CONDITIONS
OVERFLOW CONDITIONS
F 2 7 F 2 7
The overflow contact on the pressure switch is closed
The overflow contact on the pressure switch is closed
for more than 60 seconds. If the washer displays F27, for more than 60 seconds. If the washer displays F27,
the washer is probably full of water, and the water supply the washer is probably full of water, and the water supply
has been shut off. If not, water will be pouring out
has been shut off. If not, water will be pouring out
of the washer from the dispenser and door. of the washer from the dispenser and door.
Possible Causes Possible Causes
– Inlet valve(s) unable to close. – Inlet valve(s) unable to close.
– Pressure switch hose is kinked. – Pressure switch hose is kinked.
Procedure Procedure
1. Clear error code. 1. Clear error code.
2. Unplug the washer or disconnect power.
2. Unplug the washer or disconnect power.
3. Remove electrical connections for cold and hot inlet 3. Remove electrical connections for cold and hot inlet
valves. If water continues to flow into washer, inlet valves. If water continues to flow into washer, inlet
valve needs to be replaced. valve needs to be replaced.
4. Check if pressure switch hose is kinked.
4. Check if pressure switch hose is kinked.
5. Verify functionality of inlet valves by running 5. Verify functionality of inlet valves by running
a diagnostic cycle. a diagnostic cycle.
COMMUNICATION FAILURE BETWEEN COMMUNICATION FAILURE BETWEEN
F 28 F 28
CCU AND MCU
CCU AND MCU
The communication between the Central Control Unit
The communication between the Central Control Unit
(CCU) and the Motor Control Unit (MCU) has failed. (CCU) and the Motor Control Unit (MCU) has failed.
Possible Causes Possible Causes
– Reversed polarity or mis-wire along with open – Reversed polarity or mis-wire along with open
ground switch(es). ground switch(es).
– Communication cable from CCU (MI3) to MCU – Communication cable from CCU (MI3) to MCU
is damaged.
is damaged.
Procedure for reversed polarity or mis-wire Procedure for reversed polarity or mis-wire
1. Clear error code. 1. Clear error code.
2. Unplug washer or disconnect power. 2. Unplug washer or disconnect power.
3. Check the white wire on the RFI filter to ensure
3. Check the white wire on the RFI filter to ensure
correct polarity. White wire needs to be toward correct polarity. White wire needs to be toward
front of washer. front of washer.
4. Check outlet for correct polarity. 4. Check outlet for correct polarity.
5. Check that the ground switches of the toe panel 5. Check that the ground switches of the toe panel
and rear panel are correctly closed. Refer to and rear panel are correctly closed. Refer to
Grounding System Wiring Diagram. Grounding System Wiring Diagram.
Procedure for communication cable Procedure for communication cable
1. Clear error code.
1. Clear error code.
2. Unplug the washer or disconnect power. 2. Unplug the washer or disconnect power.
3. Perform continuity test on wire harness connections 3. Perform continuity test on wire harness connections
from CCU (MI3) to MCU (be careful not to spread the from CCU (MI3) to MCU (be careful not to spread the
Rast connector ends).
Rast connector ends).
4. Verify the drive motor operation in diagnostic mode. 4. Verify the drive motor operation in diagnostic mode.
If drum fails to tumble, replace the MCU. If drum fails to tumble, replace the MCU.
WASHER WASHER
DISPLAY DISPLAY EXPLANATION AND RECOMMENDED PROCEDURE
F 29 DOOR UNLOCK ERROR
F 29
The door is unable to unlock after 6 tries.
Possible Causes
Procedure
1. Clear error code.
2. Unplug the washer or disconnect power.
3. Manually unlock the door (page 13).
4. Ensure that the latch is secured to the front panel.
5. Check for misaligned, broken, cracked, or loose
6. Check the electrical connections between CCU
If the latch fails to unlock after checking all of the
above, replace the latch.
OVERHEATING OF MOTOR
F 3 1 F 3 1
The heat sink exceeds 212°F (100°C). If this condition
is met, the CCU resets the MCU, then waits for the
motor to cool down before restarting the motor.
This procedure can repeat up to 4 times before F31
is displayed.
Possible Causes
Procedure
1. Clear error code.
2. Unplug the washer or disconnect power.
3. Verify the washer is not located near a source
4. Check the electrical connections between CCU
5. Verify the drive motor operation in diagnostic mode.
If, after the above tests, the motor overheats, replace
the MCU.
6-4
PAGE 7 PAGE 7
EXPLANATION AND RECOMMENDED PROCEDURE
DOOR UNLOCK ERROR
The door is unable to unlock after 6 tries.
Possible Causes
– Misaligned or broken door latch.
– Misaligned or broken door latch.
– Electrical connections from CCU (DLS2, DL3)
– Electrical connections from CCU (DLS2, DL3)
to door lock are damaged. to door lock are damaged.
– Misaligned, broken, or overtightened door hook. – Misaligned, broken, or overtightened door hook.
Procedure
1. Clear error code.
2. Unplug the washer or disconnect power.
3. Manually unlock the door (page 13).
4. Ensure that the latch is secured to the front panel.
5. Check for misaligned, broken, cracked, or loose
door hook.
door hook.
6. Check the electrical connections between CCU
(DLS2, DL3) and latch (see page 13). (DLS2, DL3) and latch (see page 13).
If the latch fails to unlock after checking all of the
above, replace the latch.
OVERHEATING OF MOTOR
The heat sink exceeds 212°F (100°C). If this condition
is met, the CCU resets the MCU, then waits for the
motor to cool down before restarting the motor.
This procedure can repeat up to 4 times before F31
is displayed.
Possible Causes
– Improper installation of washer. – Improper installation of washer.
– Poor electrical connection from CCU (MS2) to MCU. – Poor electrical connection from CCU (MS2) to MCU.
Procedure
1. Clear error code.
2. Unplug the washer or disconnect power.
3. Verify the washer is not located near a source
of heat and has proper ventilation. of heat and has proper ventilation.
4. Check the electrical connections between CCU
(MS2) and MCU. (MS2) and MCU.
5. Verify the drive motor operation in diagnostic mode.
If, after the above tests, the motor overheats, replace
the MCU.