Proline Overheat or Grill Thermostat Trip

Microwave displays F3 and may stop mid-cycle; often associated with grill or convection modes.

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

Open grill thermostat, Overheated grill element area, Blocked airflow around grill, Faulty grill temperature sensor

Safety first: Unplug the microwave and allow it to cool completely.

User-level checks:

Ensure that metal racks or accessories are installed according to the manual and not touching the cavity walls.
Clean grease from around the grill element area to improve heat dissipation.
After cooling, test grill/convection again. If F3 returns, the thermostat or sensor is likely faulty.

Next steps:

Have a technician test and replace the grill thermostat or temperature sensor.

Hard 4/5

Grill Thermostat

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