F3E1
KitchenAid
Cavity Temperature Sensor (Thermistor) Failure
Microwave displays F3E1 and may not start or may shut off 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
Open or shorted cavity thermistor, loose thermistor connection, damaged thermistor wiring harness, overheated sensor from prolonged high-heat use
How to Fix / Troubleshooting
Safety: Unplug the microwave and allow it to cool completely before servicing.
- Locate thermistor: The cavity temperature sensor is typically mounted on the top or side of the oven cavity, accessible after removing the outer cabinet.
- Check connections: Ensure the thermistor plug is fully seated in the harness and that the wires are not pinched or burned.
- Visual inspection: Look for discoloration, cracking, or damage to the sensor body.
- Replace thermistor: If wiring is intact and F3E1 persists, replace the cavity thermistor with the OEM KitchenAid part.
- Ventilation check: Confirm that the over-the-range microwave has proper clearance and that the upper cabinet and exterior vents are not blocked, which can cause overheating.
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Repair Difficulty
Medium
3/5
Required Part
Cavity Thermistor
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