Magic Chef Intermittent Power or Overheat Protection Trip

Microwave runs for a few seconds and then shuts off with no error code; may restart if you press START again.

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.

Possible Causes

Weak door switch contacts, Overheating magnetron thermostat, Failing control board relay, Loose power connections

How to Fix / Troubleshooting

Safety: Unplug the microwave before inspection.

Basic checks:

Try running the microwave with a cup of water and observe exactly when it shuts off (e.g., at 3–5 seconds).
Listen for a click from relays or switches when it stops.

Internal inspection:

Check door switches for intermittent operation by gently wiggling the door while testing continuity.
Inspect thermal cutouts and thermostats for signs of overheating.
Inspect the control board for cold solder joints on relay pins.

Corrective actions:

Replace weak or intermittent door switches.
Replace an overheating thermostat or thermal cutout.
If relays are not holding, replace the main control board.

Repair Difficulty

Hard 4/5

Required Part

Door Switch Assembly

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