Whirlpool Microwave F6 Error Code: Repair and Reset Guide

Quick Answer

The F6 code signals a failure in the main control board relays or internal logic. In most service calls, I start by performing a hard power reset, but if the code returns, the electronic control board usually needs to be replaced to restore operation.

Look, when I get called out for an F6 on a Whirlpool microwave, I already know what I'm dealing with before I even touch the unit. It's almost always the control board. Ignore this one and you're rolling the dice on a microwave that won't shut off on its own, and that's a real fire risk. Don't keep running it hoping the code clears itself.

WhirlpoolMicrowaveSeverity: highDifficulty: advanced85% DIY Success

Time to Fix

20–60 min

Difficulty

advanced

Parts Cost

—

Tools Needed

Phillips #2 screwdriver, Flat-head screwdriver

What Does the F6 Code Mean?

OK so the F6 basically means the control board is having an identity crisis. It can't confirm whether its own relays are open or closed, and those relays are what actually switch power to the magnetron. I replaced three of these boards last month alone. Most of them happened right after storms, or on older units that got hammered at full power for years without a break.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Defective Control Board Relay75%

Logic Glitch from Power Surge15%

Wiring or Connection Issue10%

Symptoms You May Notice

F6 shows up on the display with a series of beeps, sometimes right when you hit Start, sometimes randomly mid-cycle with no warning.
The microwave flat-out refuses to run. You punch in the time, hit Start, and absolutely nothing happens except maybe more beeping.
Interior fan or light keeps running after you open the door, like the board doesn't register that the door opened at all.
Buttons on the pad feel like they're responding but nothing actually happens, or a function activates on its own without you touching anything.
Clock resets to 0:00 on its own even when there's been no power interruption you're aware of.

Can you reset a Whirlpool microwave to clear the F6 code?

Unplug the microwave and leave it alone for three full minutes, not less. While it's unplugged, hold down the Cancel or Stop/Clear button for about ten seconds to bleed off residual charge in the memory circuits. Plug it back in and let it sit for another full minute before you touch anything. Then set the clock and run a short 30-second test with a cup of water to confirm it's running clean.

Tools Required for Diagnosis

Phillips #2 screwdriverFlat-head screwdriverDigital multimeterHigh-voltage discharge tool or 25k ohm 5W resistor with insulated leadsRubber-insulated work glovesNeedle-nose pliers1/4-inch nut driver

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

ComponentComponent Under Test

Expected Range70–150 ohms

ConditionIf Open (OL) or infinite, replace component.

Frequently Asked Questions

Can I still use my microwave if it shows F6 occasionally?

Honestly? No, don't do it. I know it's tempting when the thing seems to work fine most of the time, but here's the problem with a stuck relay: the microwave might not stop heating when the timer ends. The relay that controls the magnetron could be welded closed, meaning it keeps running past your cook time. That's not just a food problem, that's a fire problem. Unplug it and keep it unplugged until it's fixed. A new control board is way cheaper than dealing with a kitchen fire or a destroyed microwave.

Is the F6 error the same as an F2 error?

They're cousins, not twins. F2 is usually your keypad or membrane switch sending phantom keypresses to the board. F6 is the board itself saying it can't trust its own relays. The fix for F2 might just be a new membrane switch, which is cheaper. F6 almost always means the board itself is going. On some older Whirlpool models from the early 2010s the codes overlap a little, but on anything made after 2015, F6 pretty clearly means it's board replacement time.

How much does it cost to fix an F6 error?

If the reset works, you're out nothing. If it doesn't, you're looking at a control board replacement. The board itself usually runs $100 to $200 depending on your model, and I've seen them as high as $250 for some of the newer over-the-range units. Add labor and you're probably looking at $250 to $400 total for a shop visit. At that price, think about the age of your microwave. If it's over 8 years old, sometimes a new unit honestly makes more sense financially.

Why did my microwave show F6 after a power outage?

Power surges. When power restores after an outage there's often a spike that hits everything plugged in at once. Microwave control boards have sensitive microprocessors that don't tolerate that kind of spike well at all. The surge either fries the processor directly or arcs the contacts inside a relay and fuses them in place. It's kind of a one-two punch: the outage stresses the board, and the surge on restoration is what actually kills it. A decent surge protector on the outlet helps prevent this from happening again.

Can I repair the relay on the board instead of replacing the whole board?

Technically yes, if you know how to solder and you can track down the right relay spec. But practically? Most shops won't do it anymore and honestly I stopped doing it too. Finding the exact replacement relay takes time, desoldering from a multilayer board without damaging the traces is genuinely tricky, and if anything else on the board also got hit during the surge you haven't actually fixed the real problem. Just replace the board. It's cleaner, it's faster, and you're not guessing about what else might be compromised.

Models Known to Experience F6 Errors

This repair applies to most Whirlpool microwaves with this error code. Common model numbers include:

WMH31017HS, WMH53521HZ, WMH31017AS, WML75011HZ, WMH78019HZ, WMH32519HZ, WMH76719CE, YWMH53521HZ

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 17, 2026