SMEG Intermittent Power Loss or Safety Trip

Microwave runs for a few seconds then stops and resets or clears the timer.

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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

Loose mains connection inside unit, Failing control PCB, Overheating transformer or magnetron triggering protection, Faulty door switch losing contact during vibration

How to Fix / Troubleshooting

Safety: Unplug the microwave before inspection. Do not continue to use a unit that resets unexpectedly.

User checks:

  • Ensure the plug fits firmly in the outlet and that the cord is not being pulled or twisted.
  • Check that the door closes securely and does not move when the unit starts (vibration can open a weak latch).
  • Try a shorter cycle with a light load to see if the issue is load-related.

If the microwave consistently stops after a few seconds, internal connections, switches, or thermal protection devices may be faulty and require professional diagnosis.

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Repair Difficulty

Hard 4/5

Required Part

Door Interlock Switch Set
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