Thermador
Convection Heating Failure
Microwave convection function does not heat or does not reach set temperature (convection models).
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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
Open convection heating element,Failed convection fan motor,Defective convection thermostat or sensor,Control board not energizing convection circuit
How to Fix / Troubleshooting
Safety first: Disconnect power before accessing rear or internal components.
- Step 1 – Verify mode: Ensure you have selected a convection or combination mode on your Thermador microwave and allowed sufficient preheat time.
- Step 2 – Check fan operation: During convection, the fan should run continuously. If not, the fan motor or control may be faulty.
- Step 3 – Test temperature: Use an oven thermometer to verify actual cavity temperature versus the set temperature.
- Step 4 – Inspect components (qualified persons): Remove the cover and access the convection heater and fan assembly. Test the heater for continuity and the fan motor for proper resistance.
- Step 5 – Replace faulty parts: Replace any open heater, failed fan motor, or defective thermostat/sensor with Thermador OEM parts.
Note: Some temperature variation is normal; consult the manual for expected performance.
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Repair Difficulty
Hard
4/5
Required Part
Convection Heating Element
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