F3E1 Serious Moderate DIY
Maytag Microwave F3E1 — Humidity Sensor Failure
Maytag Microwave · Error code F3E1
What F3E1 Means
The control has detected an open or out-of-range humidity (steam) sensor used for Sensor Cook cycles.
Symptoms
- F3E1 appears when starting a Sensor Cook cycle
- Sensor cooking does not work but timed cooking still functions
- Cycle aborts mid-way
Common Causes
1
Failed humidity sensor
Sensor element open, shorted, or contaminated with grease.
2
Loose sensor wiring
Connector to humidity sensor unseated or corroded.
3
Blocked sensor vents
Grease buildup on sensor screen prevents steam detection.
4
Control board fault
ACU input circuit for sensor has failed.
How to Fix It
- Unplug the microwave for 5 minutes.
- Use timed cook to verify the magnetron still functions normally.
- Access the humidity sensor (typically inside the cavity vent area).
- Clean any grease or buildup off the sensor and surrounding vents.
- Reseat the sensor's electrical connector at the control board.
- Use a multimeter to check sensor resistance against spec in the tech sheet.
- Replace the humidity sensor if out of spec or visibly damaged.
- If sensor tests good, replace the main control board.
Parts You May Need
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
More Maytag Microwave Codes
Verified against manufacturer documentation: maytag.com
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.