Frigidaire · Microwave Moderate

F5 — Shorted Humidity (Steam) Sensor

F5 means the humidity/steam sensor used for sensor-cook functions was detected shorted for more than 5 seconds during a cooking cycle. It's a sensor fault, not an internal relay/control-board feedback mismatch.

Keep using it?
Yes, with caution
DIY difficulty
Moderate

How to fix it

  1. Unplug the microwave.
  2. Locate and inspect the humidity/steam sensor for your model (typically near the vent inside the cavity or in the duct).
  3. Clean grease or food residue from and around the sensor.
  4. Inspect the sensor's wiring and connector for damage; reseat if loose.
  5. If F5 persists after cleaning and reseating, replace the humidity/steam sensor.

Why it happens

Typical signs: F5 appears during or after a sensor-cook cycle (e.g. Sensor Cook, Reheat, Popcorn) · Sensor-cook functions are affected or locked out · Manual time-cook functions may still work normally

  • Shorted or failed humidity/steam sensor The sensor that detects steam for automatic sensor-cook cycles has shorted.
  • Moisture, grease, or food residue bridging the sensor contacts Buildup on or near the sensor can create a false short.
  • Failed wiring or connector to the sensor Damaged harness interrupts or shorts the sensor signal.

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.

  • Frigidaire microwave humidity/steam sensor Common replacement
    Amazon →

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Frequently asked questions

What does the F5 code mean on a Frigidaire microwave?

F5 means the humidity/steam sensor used for sensor-cook functions was detected shorted for more than 5 seconds during a cooking cycle. It's a sensor fault, not an internal relay/control-board feedback mismatch.

What causes the F5 code on a Frigidaire microwave?

Shorted or failed humidity/steam sensor: The sensor that detects steam for automatic sensor-cook cycles has shorted. Moisture, grease, or food residue bridging the sensor contacts: Buildup on or near the sensor can create a false short. Failed wiring or connector to the sensor: Damaged harness interrupts or shorts the sensor signal.

Is it safe to keep using a Frigidaire microwave with a F5 error?

Yes, with caution. This is rated a moderate-severity fault.

How do I fix F5 on a Frigidaire microwave?

Unplug the microwave. Locate and inspect the humidity/steam sensor for your model (typically near the vent inside the cavity or in the duct). Clean grease or food residue from and around the sensor.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.