Frigidaire Microwave F5 error code

The humidity sensor shorted during the cooking process. The sensor that measures steam for automatic cooking modes is reporting a short.

Also shown as: F5

Last updated: October 6, 2026

Quick answer: Frigidaire microwave error code F5: humidity sensor shorted. The most common cause is failed humidity (gas) sensor. Try this first — unplug for one minute. If that does not clear it, use manual cooking modes. If the code persists, call a qualified technician.

What causes the F5 error?

  • Failed humidity (gas) sensor
  • Sensor wiring loose or damaged
  • Steam or moisture intrusion into the sensor
  • Failing smart control board reading the sensor

How to fix Frigidaire F5 — step by step

Work through these in order, from simplest and safest first. Stop as soon as the code clears.

  1. Unplug for one minute
    Unplug the microwave for one minute, then plug it back in. If F5 only appeared once during a steamy sensor-cook cycle, it may have been a false reading.
  2. Use manual cooking modes
    Avoid Sensor Cook, Sensor Reheat, and similar automatic modes for now. Use manual time and power settings instead, which do not use the humidity sensor.
  3. Keep vents clear
    Do not run sensor-cook cycles with the microwave's vents blocked or the unit pushed tight against a wall. Trapped steam can overwhelm the sensor.
  4. Call a technician for sensor service
    A returning F5 means the humidity sensor, its wiring, or the control board needs professional testing and replacement.
    Safety warning: Never open the microwave to reach the sensor. High-voltage components sit inside the cabinet.

When to call a technician

Stop and call a qualified technician if any of these apply:
  • F5 returns on every sensor-cook cycle
  • Manual modes work but all sensor modes fail
  • The humidity sensor needs replacement
  • The control board is misreading the sensor

Frequently asked questions

F4 vs F5: what is the difference?

F4 means the humidity sensor went open (disconnected) during cooking. F5 means the sensor shorted during cooking. Both point to the same sensor.

Can I still use the microwave with F5?

Yes. The sensor is only used for sensor-cook modes. Regular time-based cooking does not need it.

Will unplugging fix the sensor?

It clears glitch readings, but a genuinely failed sensor brings F5 back the next time a sensor mode runs.

Sources

Every meaning and fix above was checked against official manufacturer documentation:

FixCode provides general troubleshooting information only — not professional repair advice. If you are unsure about any step, stop and call a qualified technician. Repairs done incorrectly can be dangerous and may void your warranty.

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