F3
RCA
Sensor Circuit Short or Open
Microwave displays F3 and sensor cooking functions are disabled.
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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
Shorted humidity sensor, Broken sensor wiring, Corroded sensor connector, Failed sensor input on control board
How to Fix / Troubleshooting
Safety Warning: Unplug the microwave before accessing the control area.
Steps:
- 1. Reset: Unplug for 5 minutes, then plug back in. If F3 returns when using sensor modes, the sensor circuit is likely faulty.
- 2. Clean cavity: Thoroughly clean the interior to remove heavy steam residue and grease that can affect sensor readings.
- 3. Inspect sensor wiring: With the unit unplugged, remove the control panel and locate the humidity sensor harness. Ensure the connector is tight and wires are intact.
If cleaning and reseating do not resolve F3, replace the humidity sensor. If the error persists with a new sensor, the control board is likely defective.
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Repair Difficulty
Hard
4/5
Required Part
Humidity Sensor
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