Frigidaire Microwave F1 error code

The relay control board is defective. The board that switches power to the microwave's components has failed.

Also shown as: F1

Last updated: October 6, 2026

Quick answer: Frigidaire microwave error code F1: relay control board defective. The most common cause is failed relay control board. Try this first — unplug for one minute. If that does not clear it, note any recent power events. If the code persists, call a qualified technician.

What causes the F1 error?

  • Failed relay control board
  • Power surge damaging the board
  • Failing relay that switches the magnetron or fan
  • Loose connector between the relay board and the control panel

How to fix Frigidaire F1 — 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 a full minute, then plug it back in and try a short heating test with a cup of water. If F1 returns, the board fault is confirmed.
  2. Note any recent power events
    If F1 appeared after a storm or outage, a surge likely damaged the board. Mention this to your technician.
  3. Call a technician for board replacement
    F1 means the relay control board is defective and needs replacement. Microwave boards sit next to the high-voltage section, so replacement is strictly technician work.
    Safety warning: Never remove the microwave cover. The capacitor can hold a lethal charge even when unplugged.

When to call a technician

Stop and call a qualified technician if any of these apply:
  • F1 returns after unplugging for a minute
  • The microwave is dead or behaves erratically
  • The relay control board needs replacement
  • Any burning smell from the microwave (unplug it immediately)

Frequently asked questions

F1 vs F3: what is the difference?

F1 is a failed relay control board. F3 is a shorted keypad key. Different parts, different repairs.

Will F1 go away on its own?

A board fault will not heal itself. Plan on professional diagnosis and board replacement.

Is it dangerous to open a microwave showing F1?

Yes. Microwaves store a lethal electrical charge in the capacitor even when unplugged. Never remove the cover.

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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