F40
Kenmore
ATC (Automatic Temperature Control) or Communication Error
Washer displays F40; may not start or may stop shortly after starting.
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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, corrupted control firmware
How to Fix / Troubleshooting
Safety First: Unplug the washer before accessing controls.
Steps:
- Check temperature sensor: Test the NTC sensor at the heater for proper resistance. Replace if faulty.
- Inspect wiring: Verify harness integrity between sensor and main control.
- Control replacement: If sensor and wiring are good, replace the main control board.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board (CCU)
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