F40
Whirlpool
ACU / CCU Power or Communication Fault
Washer displays F40, communication or power supply error on some Whirlpool models.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Loose power connections to control, failed main control board, line voltage issues, internal control communication failure
How to Fix / Troubleshooting
Safety first: Turn off breaker and unplug the washer.
Step-by-step:
- Verify supply voltage: Confirm correct voltage at the outlet and that polarity and ground are correct.
- Inspect power harness: Check the power cord and connections to the main control for tightness and signs of overheating.
- Reset control: Leave unplugged for 5–10 minutes, then restore power and test.
- Control replacement: If F40 persists and wiring is good, the main control likely needs replacement.
When to call a technician: Power and control issues should generally be handled by a qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board (CCU)
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