KitchenAid Microwave F1E5 Error Code: Humidity Sensor Fault

Quick Answer

KitchenAid F1E5 means the humidity sensor for sensor cooking has failed. This sensor is mounted on the ceiling of the microwave cavity and measures steam output from food to auto-determine cooking time. F1E5 triggers when the sensor reads completely out of range (open circuit or shorted).

Fifteen years doing these calls and honestly, nine times out of ten it's the same story: nobody covers their food. Steam and grease splatter hit that sensor up on the ceiling and eventually it just gives up. Good news though, your microwave still works fine on manual timer. You're not dead in the water. It's usually a $20-45 part and about an hour of your time, so don't panic.

KitchenaidMicrowaveSeverity: lowDifficulty: intermediate85% DIY Success

Time to Fix

10–45 min

Difficulty

intermediate

Parts Cost

$15 – $30

Tools Needed

Phillips #2 screwdriver, Multimeter with Ohms setting

What Does the F1 E5 Code Mean?

So here's the deal with KitchenAid microwaves: they're basically fancy Whirlpools. Same guts, same codes, same sensors. The F1E5 is telling you the humidity sensor, the little guy that watches for steam to figure out when your popcorn's done, has gone offline. Could be gunked up, could be dead. Either way it's usually a pretty cheap fix, probably $30-50 for the part, and you can do it yourself.

Most Likely Causes

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

Humidity sensor corroded from food splatter40%

Sensor element open circuit from age24%

Sensor wire connector corroded14%

Control board sensor input circuit fault12%

Sensor blocked by food buildup on cavity ceiling10%

Symptoms You May Notice

F1E5 flashes the second you try to run a sensor cook cycle, like Popcorn or Sensor Reheat, but nothing else seems wrong.
All your smart cooking buttons are completely dead while Time Cook still works perfectly fine, which is actually good news because it means your magnetron's okay.
Sometimes it shows up right at power-up before you've even touched a single button.
The microwave starts a sensor cook cycle, runs for 30-60 seconds, then just stops cold and throws the code instead of finishing.
You hit the Popcorn button and instead of actually cooking anything, it just beeps twice and sits there showing F1E5.

Can you reset a Kitchenaid microwave to clear the F1 E5 code?

Unplug it or flip the breaker off for at least 5 full minutes. Not 30 seconds. Five minutes, let the control board fully discharge. Plug it back in and wait for the display to come up. If F1E5 is still sitting there after that, the board found the same fault it found before and a simple reset won't get you anywhere. Means you've got a bad sensor or a corroded connection and that's what needs to get fixed.

Tools Required for Diagnosis

Phillips #2 screwdriverMultimeter with Ohms settingCotton swabsMicrofiber cloth or soft ragMild dish soapWhite vinegar and water for steam cleaning

Diagnostic Checklist

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

ComponentComponent Under Test

Expected Range10000–50000 ohms

ConditionIf Open (OL) or infinite, replace component.

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
KitchenAid/Whirlpool Humidity SensorModel-specific · $15–$30	Model-specific	$15 – $30

Frequently Asked Questions

Can I keep using my KitchenAid microwave with F1E5?

Absolutely. Just use the Time Cook button and forget the smart features for now. The F1E5 only kills the sensor cook functions like Popcorn or Sensor Reheat where the microwave's trying to guess when your food is done by reading steam. Your magnetron, turntable, and everything else still works perfectly fine. Honestly I'd say you're about 90 percent functional while you wait on the part. Just set your own timer like it's 1987.

Is the KitchenAid F1E5 the same as Whirlpool F1E5?

Yep, effectively the same machine under the skin. KitchenAid is the premium tier in the Whirlpool family and they share the same diagnostic architecture, the same error codes, and usually the same replacement parts. If you find a YouTube repair video for a Whirlpool microwave with F1E5, you can follow it step for step on your KitchenAid. Just double-check the part number against your specific model label to be sure.

How do I prevent F1E5 from coming back after I fix it?

Cover your food. That's basically it. A microwave-safe splatter cover costs like three bucks and it keeps the grease and food particles off that sensor port on the ceiling. And once a month, just wipe the ceiling down with a damp cloth. Doesn't take 30 seconds. I've seen this same sensor fail twice on the same unit because the homeowner went right back to heating uncovered pasta sauce every night. The repair's easy but it's annoying to do twice.

How much does the sensor cost and is it worth fixing?

The humidity sensor runs about $20-45 depending on where you buy it, and if you're comfortable with a screwdriver you can swap it yourself in under an hour. A new over-the-range microwave of comparable quality runs $400-700 installed, so even if you pay someone for labor you're still way ahead. The only time I'd say skip the repair is if the unit is 10+ years old and already has other problems stacking up. Otherwise, fix it.

What's the part number for the KitchenAid humidity sensor?

W10661017 covers a lot of the KitchenAid and Whirlpool over-the-range models built after 2014. But don't just order that and hope for the best. Pull the model number off the sticker inside your door jamb, it's usually on the left side, and type it into any major appliance parts site. Some of the older KMHS and KMHC series models need a slightly different version. Two minutes of verification saves you a week of waiting on a wrong part.

Related Kitchenaid Microwave Error Codes

Code: DOORKitchenAid Microwave Door Error Code: HUBWhirlpool Microwave Error Codes (same platform)

Same Fix Works on These Brands

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

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Models Known to Experience F1 E5 Errors

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

KMHS120EBS, KMHC319EBS, KMMF330PBS, YKMHS120ES, KMHC319KPS, KMHS120ESS, KMHC319PBS, KMHS120KPS

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 15, 2026