Thermador
Improper Flame / Low Burner Output
Gas burner ignites but the flame is very weak or uneven, especially on simmer.
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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
Partially clogged burner ports, Incorrectly adjusted simmer valve, Low gas pressure, Wrong orifice for gas type (NG vs LP)
How to Fix / Troubleshooting
Safety first: Turn burner OFF and allow components to cool before handling.
- Clean ports: Remove burner cap and clean all ports with a soft brush. Clear any debris with a wooden toothpick.
- Check cap alignment: Ensure the cap is properly seated; misalignment can cause uneven flames.
- Verify gas type: Confirm the range is configured for your gas type (natural gas or LP). Using the wrong orifices will cause poor flame characteristics.
- Adjust simmer (advanced): Many Thermador burners have a small adjustment screw near the valve stem accessible with the knob removed. With the burner on low, turn the screw slightly to achieve a stable, small blue flame. Refer to the service manual for exact procedure.
If flames remain weak on all burners, have a technician check gas pressure and regulator operation.
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Repair Difficulty
Medium
3/5
Required Part
Burner Orifice / Simmer Valve
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