F20
Brandt
Communication Failure Between UI Board and Main Control Board
Display shows communication error, oven functions disabled
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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 communication harness, Faulty user interface PCB, Faulty main control PCB, Electrical noise or surge damage
How to Fix / Troubleshooting
Safety first: Isolate the oven from mains before removing the control panel or rear cover.
- Power cycle: Disconnect power for 10 minutes, then reconnect. This can reset communication errors caused by transient glitches.
- Check harness: Remove the front control panel and rear cover to access the communication cable between the UI and main board. Reseat all connectors and inspect for damage or corrosion.
- Inspect boards: Look for visible damage (burn marks, cracked components) on both PCBs. If one board is clearly damaged, replace it.
- Board substitution: If available, test with a known good UI or main board to isolate the faulty module. In most home scenarios, replacing the main control board is the typical repair.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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