Bomann
Main Power to Heating Circuit Failure
Oven does not heat at all in any mode, display and light work normally
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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
Tripped thermal cut-out on oven cavity, Faulty function selector switch not supplying power to elements, Broken neutral or live wire to heating circuit, Failed main control board relay output
How to Fix / Troubleshooting
Safety: Disconnect power before opening panels.
Diagnostic steps:
- Confirm that the oven light and display operate, but no heat is produced in any mode.
- Access the rear or top of the oven and locate the thermal cut-out / safety thermostat on the cavity. Test for continuity; if open and non-resettable, replace it.
- Check the function selector switch for burned contacts or loose wires. Test continuity in several modes according to the wiring diagram.
- Inspect the wiring harness from the selector or control board to the heating elements for breaks or burned connectors.
- If all wiring and safety devices are intact, the main control board relay that feeds the heating circuit may have failed and the board may need replacement.
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Repair Difficulty
Hard
4/5
Required Part
Thermal Cut-Out / Safety Thermostat
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