E3
Maytag Magnetron Overheat or Thermal Cutout Trip

Microwave displays E3 and may shut down during cooking.

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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

Blocked cooling airflow, Failed internal cooling fan, Open magnetron thermostat, Overheated magnetron

How to Fix / Troubleshooting

Safety first: Unplug the microwave. High-voltage components are present; internal thermal devices should be serviced by professionals.

Ventilation:

  • Ensure that all external vents are clear and that installation clearances are met.
  • Clean grease filters and any accessible vent screens.

Cooling fan:

  • Listen for the internal cooling fan when the unit runs. If it is not operating, the fan motor or control board may be faulty.

Professional service:

  • E3 often indicates that a thermal cutout or magnetron thermostat has opened due to overheating.
  • A technician should test and replace any open thermostats and verify fan and magnetron operation.
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Repair Difficulty

Professional Required 5/5

Required Part

Magnetron Thermostat
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