Panasonic
Stuck lamp relay or door switch not detecting closure
Oven cavity light stays on all the time, even when the door is closed and oven is off.
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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
Lamp relay contacts welded closed, Faulty door switch, Shorted lamp control transistor on PCB, Misaligned door latch
How to Fix / Troubleshooting
Safety: Disconnect power before working on the lamp circuit or door switch.
- 1. Test door switch: Verify that the door switch changes state when the door is opened and closed. Replace if faulty.
- 2. Observe behavior: If the light stays on even when the door switch is confirmed closed, the control board is likely keeping the lamp circuit energized.
- 3. Inspect control PCB: Look for a stuck relay or burnt component in the lamp control area. Tapping the relay lightly (with power off) sometimes confirms if it is mechanically stuck.
- 4. Replace control PCB or relay: For a permanent fix, replace the lamp relay or the entire control board as per Panasonic service procedures.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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