Whirlpool Microwave Error Codes: F1E4, F1E5, F1E6, F2E1, F6

Quick Answer

Whirlpool microwave F1 codes indicate a control board or relay fault. F1E4 specifically means the power relay is stuck, causing a safety shutdown. The primary fix is replacing the main electronic control board.

I take F1E4 and F1E6 codes seriously every single time I see them. These aren't the kind of errors you dismiss and keep using the unit. What you're dealing with is a relay stuck in the 'on' position, meaning the magnetron won't stop cooking. Ignore it and you're looking at a fire risk. Usually it's the control board, and on an OTR unit that repair is often worth doing.

WhirlpoolMicrowave

About These Whirlpool Microwave Error Codes

OK so when your Whirlpool microwave throws an F-series code, the first thing I do is look at where it's installed. Steam from the range below is honestly one of the biggest killers of touchpads and control boards I see. F2E1 usually just needs a dry-out and maybe a new keypad membrane. But F1E4 or F1E6? That's a board swap, full stop, don't mess around with those.

Most Common Error Codes

Control board power relay stuck (F1E4)40%

Keypad membrane switch shorted (F2E1)24%

Magnetron relay failure (F1E6)14%

Inter-board communication loss (F6)12%

Humidity sensor fault (F1E5)10%

Symptoms You May Notice

The display throws one of these F codes and the microwave refuses to start. Not even a beep when you press buttons.
Microwave runs all by itself with the door closed and nobody touched it. That's the scary one. Unplug it right now.
Keys on the touchpad beep randomly or register presses that didn't happen.
Display flickers the error code for a second then goes completely dark.
Unit starts fine but shuts itself down mid-cook and throws the code, sometimes 30 seconds in, sometimes halfway through a full cycle.

Tools Required for Diagnosis

Phillips #2 screwdriverFlathead screwdriver (for prying panel clips)1/4" and 5/16" nut driverNeedle-nose pliersMultimeter (qualified technicians only, for capacitor discharge verification)

How to Identify Your Error Code

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Whirlpool Microwave Control BoardModel-specific · $80–$200	Model-specific	$80 – $200
Whirlpool Microwave Touchpad/MembraneModel-specific · $50–$120	Model-specific	$50 – $120

Frequently Asked Questions

Is it safe to keep using my microwave with an error code?

If you're seeing F2E1, it's mostly a nuisance. But F1E4 and F1E6 are genuine fire hazards. Those codes mean the relay controlling the magnetron, the part that actually generates the heat, isn't shutting off when it should. I've personally seen units where the magnetron kept running after the door was opened or the timer hit zero. That thing will overheat fast, and if there's anything in the cavity it can ignite. If you see F1E4 or F1E6, unplug the unit right now and don't use it again until it's repaired.

Whirlpool microwave repair vs replace: when does it make sense?

Countertop model? Honestly it's basically a toaster. Toss it and buy a new one, the repair usually doesn't pencil out. But over-the-range is a different story. A new OTR microwave runs $300-$600, plus you've got to mount it, which is a two-person job minimum. If the unit's under five years old and needs a $150 control board, I almost always recommend the repair. If it's older than seven years and has been above a gas burner that whole time, the magnetron itself is probably tired too. At that point just replace the whole unit.

Why does my Whirlpool microwave show F2E1 after I steam food?

Classic design problem I see constantly. Over-the-range microwaves sit directly above boiling pots, and if your vent fan isn't running or isn't strong enough, that steam rises and seeps into the sensitive layers of the touchpad membrane. It creates phantom button presses that trigger F2E1. I see this especially on units above gas ranges where the vent fan filter hasn't been cleaned in years. To prevent it, always run the fan on high when you're boiling anything, and wipe the control panel dry right after you're done cooking.

Can I just replace the relay instead of the whole control board?

Technically yes, if you're comfortable with micro-soldering. But I don't recommend it. The relay itself costs maybe $3, but by the time a relay has failed on a microwave control board, that board's usually seen the same abuse that caused the failure. I've resoldered relays for customers who called me back six months later with a different component on the same board gone. Just replace the board. It's $100-$180, it comes with all-new components, and you're not gambling on the rest of the board holding up.

What does the F6 code mean and is it serious?

F6 is a communication fault between the main control board and the secondary board. Less dangerous than the relay codes, but it'll kill the unit's functionality completely. A lot of the time it's actually a loose wire harness connector between the two boards, which you can check yourself after unplugging. Pop the outer casing and look for any connector that's not fully seated. If all the connectors look solid, the issue's usually on the main board itself, and at that point you're looking at a board replacement, same as F1E4.

Related Whirlpool Microwave Error Codes

Code: F1E4Whirlpool Microwave F1E4: Power Relay Fault Code: DOORWhirlpool Microwave Door Error Code: F2E1Whirlpool Microwave F2E1: Keypad Short

Same Fix Works on These Brands

Whirlpool shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

Maytag washerAll Maytag Washer Error Codes: Complete Lookup Guide Maytag washerHow to Reset a Maytag Washer (3 Methods That Work)Maytag washerMaytag Washer Troubleshooting: Fix 12 Common Problems Maytag washerMaytag Washer F21: Drain Pump Clog or Failure Maytag washerMaytag F03 E01: Pressure Switch or Water Level Fault Maytag washerMaytag F0 E3 Error: Pressure Switch Malfunction

Models Known to Experience HUB Errors

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

WMH31017HZ, WMH31017HS, WMH32519HZ, WMH53521HZ, WMH76719CZ, WMH76719CB, WMH78019HZ, KMHS120EBS

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 15, 2026