Sage
Stuck Door Switch or Control Relay
Microwave interior light stays on even when the door is closed and no cooking is in progress.
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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
Door switch contacts welded closed, misadjusted door latch, stuck lamp relay on control PCB
How to Fix / Troubleshooting
Safety: Unplug the microwave before inspection.
User-level steps:
- 1. Check door closure: Open and close the door several times. If the light flickers or goes off briefly, the door switch may be intermittent.
- 2. Power reset: Unplug for 5 minutes, then plug back in. If the light comes on immediately without opening the door, a switch or relay is likely stuck.
Technician-level steps:
- 3. Test door switches: With the cover removed, test each door switch for proper open/closed operation.
- 4. Check lamp relay: Inspect the control PCB for a stuck relay controlling the lamp circuit.
Continuous lamp operation can overheat the cavity; have the fault corrected promptly.
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Repair Difficulty
Medium
3/5
Required Part
Door Interlock Switch / Lamp Relay
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