Siemens
Cavity Lamp Failure
Microwave interior light does not come on, but the unit heats and operates 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
Burned-out cavity lamp, loose lamp holder connection, failed lamp relay on control board
How to Fix / Troubleshooting
Safety warning: Lamp replacement often requires removal of the outer cabinet, exposing high-voltage components. Disconnect power and, if in doubt, use a technician.
Steps to try:
- 1. Confirm function: If heating, fan, and turntable all work, the issue is likely limited to the lamp circuit.
- 2. Check user access: Some Siemens models provide a dedicated lamp access cover. If present, unplug the unit, remove the cover, and replace the lamp with the exact Siemens-specified type.
- 3. If no access cover: Lamp replacement requires cabinet removal and should be done by a technician to avoid exposure to high voltage.
Use only the correct wattage and type of lamp specified by Siemens.
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Repair Difficulty
Medium
3/5
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