F40
Maytag
ATC (Automatic Temperature Control) Error / Communication Fault
Washer displays F40, may not start or may stop unexpectedly.
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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
Failed temperature control circuit on main board, wiring issue to temperature sensor, control board communication error
How to Fix / Troubleshooting
Safety first: Unplug the washer before accessing controls.
Step-by-step:
- Inspect temperature sensor wiring: Check the harness from the NTC sensor to the control for damage.
- Reseat connectors: Reseat the NTC connector and the corresponding connector on the control board.
- Replace control: If wiring and sensor are good, the main control ATC circuit may be faulty and the board will need replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board (CCU)
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