F20
Monogram
Communication Error Between UI and Main Control
Oven displays F20 and may not heat 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
Loose harness between user interface and main control, Electrical noise or surge, Failed main control board, Failed user interface board
How to Fix / Troubleshooting
Safety first: Disconnect power before accessing control boards.
- Power reset: Turn off the breaker for 5 minutes, then restore power. This can clear transient communication faults.
- Inspect wiring: Remove the control panel and check the harness connectors between the UI board and the main control board. Reseat all connectors firmly.
- Check for damage: Look for burned spots, corrosion, or pinched wires on the harness and boards.
- Board replacement: If F20 persists, one of the boards is likely defective. Replace the main control board first, then the user interface board if needed.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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