Whirlpool · Microwave Serious

F6 — Relay Control Board Fault

Whirlpool lists F6 on over-the-range microwaves as 'the oven could not execute the function': there may be a problem with the relay control board or its wiring.

Keep using it?
Limited use only
DIY difficulty
Hard
Verified against
producthelp.whirlpool.com ↗ Whirlpool Product Help: F6 - Error Code - Over-the-Range Microwave

How to fix it

  1. Reset power: turn off the circuit breaker(s) for one minute, turn them back on, and watch the microwave for one minute to see whether the code returns.
  2. If F6 returns, schedule service. Do not open the microwave cabinet or test parts inside it: it holds a high-voltage capacitor that can stay charged after unplugging.

Why it happens

Typical signs: F6 on the display · Microwave fan and light work but no heat · Audible chatter from inside before the code appears

  • Failed power relay on the control board The relay contacts weld or burn open after years of cycling.
  • Shorted wiring to the relay A pinched harness can fault the relay drive circuit.
  • Failed appliance control board When the relay is integral to the board, the whole ACU is replaced.

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.

  • Whirlpool microwave control board Common replacement
    Amazon →

More Whirlpool microwave codes

AccuPop Fail AccuPop Fail — Popcorn Sensor Fault Demo Demo Mode — Not Heating Door Door / Open Door Closed — Safety Reminder F1E4 F1E4 — Appliance Manager or Power Relay Fault F1E5 F1E5 — Inverter Internal Fault F2 F2 — Keypad / Control Fault

All Whirlpool codes → All microwave codes →

Frequently asked questions

What does the F6 code mean on a Whirlpool microwave?

Whirlpool lists F6 on over-the-range microwaves as 'the oven could not execute the function': there may be a problem with the relay control board or its wiring.

What causes the F6 code on a Whirlpool microwave?

Failed power relay on the control board: The relay contacts weld or burn open after years of cycling. Shorted wiring to the relay: A pinched harness can fault the relay drive circuit. Failed appliance control board: When the relay is integral to the board, the whole ACU is replaced.

Is it safe to keep using a Whirlpool microwave with a F6 error?

Limited use only. This is rated a serious-severity fault.

How do I fix F6 on a Whirlpool microwave?

Reset power: turn off the circuit breaker(s) for one minute, turn them back on, and watch the microwave for one minute to see whether the code returns. If F6 returns, schedule service. Do not open the microwave cabinet or test parts inside it: it holds a high-voltage capacitor that can stay charged after unplugging.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: producthelp.whirlpool.com.