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Troubleshooting Guide - Whirlpool CHW9050 Service Manual

Commercial he front loading washers
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PROBLEM
Won't power up
Touch pads do not respond
when pressed
Won't start cycle
Won't dispense

TROUBLESHOOTING GUIDE

NOTE: Possible Cause / Tests must be performed in the sequence shown for each
problem.
1. Check that the washer is plugged into a working outlet and look for blown fuses.
2. Unplug washer or disconnect power.
3. Check continuity of line cord and RFI line filter, and replace if necessary.
4. Check continuity of the wire harness that connects the CCU with the UI, and
replace if necessary.
5. Plug in washer or reconnect power. If the washer turns on, go to step 9.
6. Check for power going from RFI line filter to Central Control Unit (CCU) and to
transformer, using a multimeter.
7. Check for power going from transformer to the User Interface (UI), using a
multimeter.
8. Check for CCU turning on by listening for a click in the CCU when washer is
plugged in. If no click, replace CCU; if click, replace UI.
9. Verify washer operation by running a diagnostic test or any cycle.
1. Verify the use of buttons in set-up mode. If the buttons respond, go to "WON'T
START CYCLE". If the buttons don't respond, go to next step.
2. Check the connection of the matrix key board with the user interface. Make sure
ribbon connector is not folded over backwards.
3. Check for corrosion in and at the base of the ribbon connector socket on the UIC.
If corrosion is present replace UIC. If no corrosion go on to next step.
4. Check buttons using the matrix (See page 5-9).
5. Replace the keypad assembly.
6. Verify the washer operation by running a diagnostic test or any cycle.
1. Open and close the door. The door must be opened between consecutive wash
cycles.
2. Check the door lock/latch assembly using the diagnostics. See Diagnostic Test.
3. If door is locked, drain the washer either in a diagnostic mode or by draining from
the pump manually..
4. Unplug washer or disconnect power.
5. Check the wire harness connection of the door lock.
6. Check the wire harness connection of the UI–CCU.
7. Plug in washer or reconnect power.
8. Verify washer operation by running a Diagnostic Test or any cycle.
1. Verify the washer is level.
2. Verify dispenser drawer is not clogged with detergent.
• Make sure the fill tube from the dispenser to the outer tub is not blocked by an
article of clothing.
3. Check water connections to the washer and within the washer. Check for plugged
screen in water source.
4. Check water valves in diagnostic mode.
5. Check pressure switch is operating correctly and that there is no water in the
washer.
6. Look for indications of over-sudsing and check Help codes.
7. Unplug washer or disconnect power.
8. Check harness connections.
9. Plug in washer or reconnect power.
10. Verify washer operation by running a Diagnostic Test or any cycle.
6-17
POSSIBLE CAUSE / TEST

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This manual is also suitable for:

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