OK Thermal Cutout or Door Interlock Interruption

The microwave runs for a few seconds then stops with no error code; the display remains on.

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

Overheating cavity thermostat, Failing magnetron thermostat, Intermittent door switch, Blocked ventilation

Safety: Unplug the microwave and allow it to cool before inspection.

1. Check ventilation: Ensure adequate clearance around the microwave and that the vents are not blocked by cabinets or objects.
2. Test with lower power: Run the microwave at 50% power with a cup of water. If it runs longer, overheating may be the issue.
3. Inspect thermostats: With the cover removed (and the unit unplugged), locate and test the thermostats for intermittent operation using a multimeter and gentle heat (if skilled).
4. Check door switches: Perform a wiggle test on the door while the unit is running to see if movement causes shutdown.
5. Replace the faulty thermostat or door switch set as needed.

Hard 4/5

Magnetron Thermostat

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