F40
Amana ATC (Automatic Temperature Control) or Communication Error

Washer-dryer combo displays F40 and may not start.

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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, Loose harness between sensor and control, Faulty main control board

How to Fix / Troubleshooting

Safety first: Unplug the unit.

  • Check temperature sensors: Verify water and heater thermistors are connected and within spec.
  • Inspect harness: Check wiring between sensors and main control.
  • Replace control: If sensors and wiring are good, replace the main control board.
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Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board
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