Electrolux Microwave Error Code F3 — Humidity Sensor Malfunction
What this means
The F3 error code on Electrolux microwaves indicates the humidity sensor (used for sensor cooking and reheating modes) has failed or is reading incorrectly. The sensor detects steam released by food to automatically determine cooking time. When it fails, sensor cook modes will not work. Standard timed cooking may still function. Causes include a dirty sensor, a failed sensor element, or a wiring issue.
Alternate codes: F 3, F03
Step-by-step fix
4 stepsClean the humidity sensor
The humidity sensor is usually a small opening or vent on the interior top or side wall of the microwave. Clean the interior walls and ceiling of the microwave thoroughly with a damp cloth and mild cleaner. Food splatters can coat the sensor.
A mixture of water and vinegar heated in a bowl for 2 minutes will steam-clean the interior and make wiping easier.
Reset the microwave
Unplug the microwave for 3 minutes, then plug it back in. Try using a sensor cook function to see if the error clears.
Make sure to close the door firmly and use a food item that produces noticeable steam (like reheating a cup of water).
Use timed cooking as a workaround
If sensor cooking still gives an F3 error, switch to manual timed cooking for the time being. The microwave should still heat food normally using timed modes.
You can still use the microwave for all cooking — just enter the time manually instead of using sensor modes.
Contact a technician for sensor replacement
If the sensor is faulty, it needs to be replaced. Due to the high-voltage components inside microwaves, this should be done by a professional.
If the microwave is older, evaluate whether sensor replacement is cost-effective compared to replacing the entire unit.
When to call a professional
Call a professional if sensor cook modes are important to you and cleaning doesn't resolve the issue. This repair requires opening the microwave housing.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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