F4
Avanti Humidity Sensor Failure

Microwave displays F4 and stops cooking; may occur during sensor cook cycles.

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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

Failed humidity sensor, Contaminated sensor surface, Loose sensor connector, Faulty control board

How to Fix / Troubleshooting

Safety: Unplug the microwave before internal inspection.

Steps:

  • 1. Clean interior: Thoroughly clean the cavity, especially near the sensor grill, to remove grease and food residue.
  • 2. Inspect sensor module: Remove the cabinet and locate the humidity sensor. Check for physical damage or contamination.
  • 3. Reseat connector: Disconnect and reconnect the sensor plug to ensure a solid connection.
  • 4. Replace sensor: If F4 persists, replace the humidity sensor with the correct Avanti part.
  • 5. Control board: If a new sensor does not resolve F4, the control board may be faulty.
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Repair Difficulty

Medium 3/5

Required Part

Humidity Sensor
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