Maytag 30 Series Service Manual page 86

ACCU
TRAC WASHER
®
INDICATION DISPLAY EXPLANATION AND RECOMMENDED PROCEDURE
OVERFLOW CONDITIONS
d 2 1
F 2 7
The overflow contact on the pressure switch is closed
for more than 60 seconds. If the washer displays F27,
the washer is probably full of water, and the water supply
has been shut off. If not, water will be pouring out
of the washer from the dispenser and door.
Possible Causes
– Inlet valve(s) unable to close.
– Pressure switch hose is kinked.
Procedure
1. Clear error code.
2. Unplug the washer or disconnect power.
3. Remove electrical connections for cold and hot inlet
valves. If water continues to flow into washer, inlet
valve needs to be replaced.
4. Check if pressure switch hose is kinked.
5. Verify functionality of inlet valves by running
a diagnostic cycle.
COMMUNICATION FAILURE BETWEEN
d 20 F 28
CCU AND MCU
The communication between the Central Control Unit
(CCU) and the Motor Control Unit (MCU) has failed.
Possible Causes
– Reversed polarity or mis-wire along with open
ground switch(es).
– Communication cable from CCU (MI3) to MCU
is damaged.
Procedure for reversed polarity or mis-wire
1. Clear error code.
2. Unplug washer or disconnect power.
3. Check the white wire on the RFI filter to ensure
correct polarity. White wire needs to be toward
front of washer.
4. Check outlet for correct polarity.
5. Check that the ground switches of the toe panel
and rear panel are correctly closed. Refer to
Grounding System Wiring Diagram.
Procedure for communication cable
1. Clear error code.
2. Unplug the washer or disconnect power.
3. Perform continuity test on wire harness connections
from CCU (MI3) to MCU (be careful not to spread the
Rast connector ends).
4. Verify the drive motor operation in diagnostic mode.
If drum fails to tumble, replace the MCU.
ACCU
TRAC WASHER
®
INDICATION DISPLAY EXPLANATION AND RECOMMENDED PROCEDURE
DOOR UNLOCK ERROR
d 1 9 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.
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
d 1 0 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
– Misaligned or broken door latch.
– Electrical connections from CCU (DLS2, DL3)
to door lock are damaged.
– Misaligned, broken, or overtightened door hook.
door hook.
(DLS2, DL3) and latch.
– Improper installation of washer.
– Poor electrical connection from CCU (MS2) to MCU.
of heat and has proper ventilation.
(MS2) and MCU.