F3
Avanti Temperature or Sensor Circuit Error

Microwave displays F3 and may not start; sensor cooking functions fail.

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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/shorted temperature sensor, Damaged sensor wiring, Faulty sensor input on control board, Incorrect sensor replacement

How to Fix / Troubleshooting

Safety: Unplug the microwave before accessing internal sensors.

Steps:

  • 1. Identify sensor type: Determine if your Avanti model uses a cavity thermistor, humidity sensor, or both. Refer to the service documentation if available.
  • 2. Inspect wiring: Check all sensor harnesses for pinched, cut, or burned wires. Reseat connectors at both ends.
  • 3. Test sensors: Measure resistance of each sensor at room temperature and compare to specifications. Replace any sensor that is open, shorted, or out of range.
  • 4. Replace control board: If sensors and wiring are good, the control board sensor circuit may be defective and require replacement.
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Repair Difficulty

Hard 4/5

Required Part

Cavity Thermistor
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