7
FOR SERVICE TECHNICIAN ONLY - DO NOT REMOVE OR DESTROY
WASHER
DISPLAY
EXPLANATION AND RECOMMENDED PROCEDURE
F 27
OVERFLOW CONDITIONS
The overflow contact on the pressure sensor 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 sensor 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 sensor hose is kinked.
5. Verify functionality of inlet valves by running
a diagnostic cycle.
F 28
COMMUNICATION FAILURE BETWEEN
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.
WASHER
DISPLAY
EXPLANATION AND RECOMMENDED PROCEDURE
F 29
DOOR UNLOCK ERROR
The door is unable to unlock after 6 tries.
Possible Causes
– Misaligned or broken door latch.
– Electrical connections from CCU (DLS2, DL3)
to door lock are damaged.
– 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.
6. Check the electrical connections between CCU
(DLS2, DL3) and latch (see page 13).
If the latch fails to unlock after checking all of the
above, replace the latch.
F 31
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.
– 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.
4. Check the electrical connections between CCU
(MS2) and MCU.
5. Verify the drive motor operation in diagnostic mode.
If, after the above tests, the motor overheats, replace
the MCU.
F 33
PUMP DISCONNECTED
The electrical connection between the pump and the
CCU is lost.
Possible Causes
– Poor connection between CCU (DP2) and drain
pump.
– Pump thermal overload caused by the pump
running for an extended period of time.
Procedure
1. Clear error code.
2. Unplug the washer or disconnect power.
3. Check electrical connection between pump and
CCU (DP2) (see page 13).
4. Check the pump using a diagnostic mode.
If all of the above are OK and the pump still does not
run, replace the CCU.