Overflow Conditions - Whirlpool CGT9000GQ Manual

FOR SERVICE TECHNICIAN ONLY - DO NOT REMOVE OR DESTROY
WASHER
DISPLAY EXPLANATION AND RECOMMENDED PROCEDURE
F 25
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 Causes
– Damaged or poor contact in electrical connection
from MCU to drive motor.
– Inverted wires on RFI or ground switch(es) open.
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.
Procedure for inverted wires on RFI
1. Clear error code.
2. Unplug the washer or disconnect power.
3. Look for reversed polarity at RFI filter.
4. Make sure that the ground switches of the toe panel
or rear panel are closed and working correctly.
5. Check operation of drive motor in diagnostic mode;
if drum tumbles, the motor is OK.
If, after these procedures, the drum fails to tumble,
replace the MCU. If motor operation is not restored,
replace the motor.
F 26
DOOR SWITCH ERROR
The door switch circuit is open for 5 seconds while the
door is locked.
Possible Causes
– Electrical connections from CCU (DLS2) 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 14) or continuity test at CCU (DLS2)
connection.
If the door switch circuit fails to open or close, replace
the door latch.
WASHER
DISPLAY
F 27
F 28
PAGE 8
EXPLANATION AND RECOMMENDED PROCEDURE

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. If water continues to flow into washer, inlet valve
needs to be replaced.
4. Check if pressure sensor hose is kinked or damaged.
5. Verify functionality of inlet valves and pressure
sensor 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 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 outlet for correct polarity.
4. Check the white wire on the RFI filter to ensure
correct polarity. White wire needs to be toward front
of washer. If the RFI filter is not easily accessible,
the polarity test can be made on the washer CCU.
Disconnect power. Check for resistance or continuity
at IF2 from terminal #1 to ground or any bare metal
on the washer cabinet. Reading should be infinite
or show as an open circuit.
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.