F40
KitchenAid
Overvoltage / Undervoltage or Power Supply Error
F40 appears; washer-dryer may not start or may shut down 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
Incorrect supply voltage, loose power cord connection, faulty line filter, internal power supply fault on control board
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before inspecting electrical connections.
- Verify supply voltage: Use a multimeter to confirm the outlet provides the correct voltage (typically 120V AC in North America). Correct any household wiring issues.
- Inspect power cord: Check the cord and plug for damage, burns, or loose prongs. Replace if damaged.
- Check line filter and connections: Access the line filter/noise suppressor near the cord entry. Ensure all connections are tight and components are not burnt.
- Control board power supply: If external power is correct, the internal power supply on the main control may be faulty. Replace the control board if indicated by diagnostics.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board (CCU)
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