5
FOR SERVICE TECHNICIAN ONLY - DO NOT REMOVE OR DESTROY
FAILURE/DIAGNOSTIC DISPLAY CODES
WASHER
DISPLAY
EXPLANATION AND RECOMMENDED PROCEDURE
F 01
CCU ERROR
Communication error within the Central Control Unit
(CCU); the pump drive in CCU fails to activate; one of
the main relays in the CCU fails to activate.
Possible Causes
– A power surge/drop.
– Reversed polarity or mis-wire, along with open
ground switches.
Surge/drop procedure
1. Clear error code.
2. Unplug washer or disconnect power.
3. Wait 2 minutes before reconnecting power.
4. Verify CCU by running a short diagnostic test.
Mis-wire or reversed polarity procedure
1. Clear error code.
2. Check the white wire on the RFI filter to ensure
correct polarity. White wire needs to be toward front
of washer.
3. Check outlet for correct polarity. To check within
washer for polarity at the RFI, white to cabinet
ground must be 0 V.
4. Check that the ground switches of the toe panel
and rear panel are correctly closed.
5. Verify CCU by running a short diagnostic test.
If these procedures do not correct the failure, replace
the CCU control.
F 04
ACCELEROMETER FAILURE
The accelerometer component failed. The X, Y, and Z
limits are outside of the normal range.
Possible Causes
– CCU dislodged from mounting.
– Accelerometer failure on CCU.
F 11
MCU ERROR
Motor Control Unit (MCU) has a failure.
Possible Causes
– A repeating under or overvoltage condition. If the
failure occurs during a high-speed spin, the door
remains locked for 2 minutes.
Procedure
1. Clear error code.
2. Unplug the washer or disconnect power.
3. Using Ohm meter, check wire harness connections
for continuity between drive motor and the MCU.
4. Check the motor and do a continuity test (page 13).
5. The MCU is good if the motor operates in diagnostic
mode.
If the motor fails to turn on, replace the MCU.
WASHER
DISPLAY
EXPLANATION AND RECOMMENDED PROCEDURE
F 20
NO WATER DETECTED ENTERING WASHER
The error occurs when the first level of the pressure
sensor is not reached within 6 minutes, or the second
level is not reached within 6 minutes of reaching the
first level. The UI will display “lo h2o” once the error
occurs and will continue to display until the door is
opened. The user is allowed to start the next cycle once
payment is made.
Possible Causes
– No water to washer; faucet(s) turned off.
– Defective hot and/or cold valve(s).
– Plugged or kinked inlet hoses or valves.
– Pressure sensor or pressure sensor hose
damaged, kinked, or disconnected.
– Electrical connection from CCU (PS8) to pressure
sensor damaged.
–
Drain hose forced down into standpipe > 6" (152 mm).
– Blocked inlet from dispenser to tub.
Procedure
If the F20 error code persists, perform the
following steps:
1. Unplug washer or disconnect power.
2. Check incoming water pressure at faucet.
3. Check inlet hoses for possible leaks.
4. Ensure pressure sensor hose is in good condition
and properly connected to tub and pressure sensor.
5. Verify that water is not running out of the drain hose
(siphoning) as it is filling.
6. Perform continuity test on wire harness connections
from CCU to inlet valves (VCH7 and VSF2), pressure
sensor (PS8), and drain pump (DP2).
7. Check inlet valves by running a diagnostic test; if
water fills too slowly, replace the appropriate inlet valve.
8. Check that the pump is not running while the
washer is filling.
9. Verify pressure sensor operation by accessing
Help Mode while running a paid cycle (see Help
Mode Symbols and Elements, page 12).
F 21
LONG DRAIN
The drain time exceeds 8 minutes without reaching
reset level in pressure sensor.
NOTE:
n
Suds can cause delays in draining, indicated by an
alternating display of “SudS” and a countdown timer.
Washer drains for 4 minutes, pauses 5 minutes, then
tries again for 4 additional minutes of draining. F21
will display if washer does not drain. (Normal drain
takes less than 2 minutes).
Possible Causes
– Damaged or blocked pump.
– Washer fills during drain.
– Excess suds causing cavitating pump.
– Drain hose blocked, kinked, or exceeds
recommended height.
– Poor connection between CCU (DP2) and drain pump.
Procedure
1. Clear error code.
2. Unplug washer or disconnect power.
3. Ensure the drain hose is not sealed in the standpipe.
4. Ensure the drain height is not more than 8 ft (2.4 m)
above the base of the washer.
5. Check the drain hose; ensure it is not plugged or kinked.
6.
Check the drain pump for foreign objects or worn impeller.
7. Check the electrical connection between the pump
and the CCU (DP2).
8. Check the pump using a diagnostic mode.
9. Check pressure sensor operation in Help Mode and
the condition of the pressure sensor hose.
If all the above are OK and pump is powered but does
not pump water or water flow is poor, replace the pump.