F7
Bauknecht
Communication Error Between Control Board and Inverter/Power Module
Microwave shows F7; sometimes accompanied by erratic display or beeping.
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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, Corroded connectors, Faulty control board communication circuit, Defective inverter module
How to Fix / Troubleshooting
Safety first: Unplug the microwave before accessing internal components.
- Step 1 – Power reset: Disconnect power for 5–10 minutes and test again.
- Step 2 – Inspect wiring: Access the control board and inverter module. Check the low-voltage communication cable between them for damage or loose connectors. Reseat both ends.
- Step 3 – Check for moisture: Look for signs of moisture or corrosion around connectors; dry and clean carefully if present.
- Step 4 – Replace suspect module: If wiring is intact and F7 persists, either the control board or inverter module is faulty. Typically, technicians will substitute the inverter module first, then the control board if needed.
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Repair Difficulty
Professional Required
5/5
Required Part
Inverter Power Module
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