ACCU
TRAC
®
WASHER
INDICATION DISPLAY
EXPLANATION AND RECOMMENDED PROCEDURE
TACHOMETER ERROR
If the MCU is unable to properly detect motor speed,
the washer shuts down. If a failure occurs during high-
speed spin, the door remains locked for 2 minutes.
Possible Cause
– Damaged or poor contact in electrical connection
from MCU to drive motor.
Procedure for damaged MCU connection
1. Clear error code.
2. Unplug the washer or disconnect power.
3. Check for broken belt.
4. Verify that the shipping system, including shipping
bolts and spacers, is removed, and that the power
cord is not tangled in any components inside rear
of washer.
5. Verify electrical connection between MCU and drive
motor connector.
6. Reassemble any disassembled parts.
7. Reconnect to power.
8. Check operation of drive motor in diagnostic mode;
if drum tumbles, the MCU and motor are OK.
If, after this procedure, the drum fails to tumble,
replace the MCU. If motor operation is not restored,
replace the motor.
DOOR SWITCH ERROR
The door switch circuit is open for 5 seconds while the
door is locked.
Possible Cause
– Electrical connections from CCU (DCS3) to door
switch in latch are damaged.
Procedure
1. Clear error code.
2. Unplug the washer or disconnect power.
3. Verify the electrical connection between CCU and
door switch by using the Help Mode (see appropriate
symbols, page 13) or continuity test at CCU (DCS3)
connection.
If the door switch circuit fails to open or close, replace
the door latch.
FOR SERVICE TECHNICIAN ONLY - DO NOT REMOVE OR DESTROY
PART NO. W10340707A
PAGE 7
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1 2
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ACCU
TRAC
®
WASHER
INDICATION DISPLAY
EXPLANATION AND RECOMMENDED PROCEDURE
OVERFLOW CONDITIONS
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
CCU AND MCU
The communication between the Central Control Unit
(CCU) and the Motor Control Unit (MCU) has failed.
Possible Cause
– Communication cable from CCU (MI3) to MCU
is damaged.
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.
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2 1
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2 0
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