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ErrBase

GE Oven F4 Error: Temperature Sensor Fix

Quick Answer

The F4 error code means your GE oven has a faulty temperature sensor or a wiring issue in the sensor circuit. In most service calls, replacing the oven sensor probe located in the back of the oven cavity resolves the problem immediately.

So you've got an F4 on your GE oven and now it won't heat. The control board lost contact with the temperature sensor and locked everything out as a safety move. Ignore it and you're stuck with a dead oven. Honestly, this is one of the more satisfying fixes because nine times out of ten it's a $25 sensor and 20 minutes of your time.

GeOvenSeverity: highDifficulty: intermediate92% DIY Success
Time to Fix
20–50 min
Difficulty
intermediate
Parts Cost
—
Tools Needed
Phillips #2 screwdriver, 1/4 inch nut driver

What Does the F4 Code Mean?

OK so here's the deal with F4. Your oven's brain needs a constant resistance reading from that little probe in the back wall to know how hot things are inside. When that reading goes to zero or infinity, the board says nope and shuts down bake and broil entirely. I've seen this code on everything from brand new ovens to 15-year-old workhorses, but it spikes a ton after self-clean cycles. Parts are cheap and the fix is pretty DIY-friendly.

Most Likely Causes

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

Defective sensor probe80%
Wiring harness issues15%
Control board failure5%

Symptoms You May Notice

  • The oven display shows F4 and beeps repeatedly, and hitting Cancel clears it but it comes right back the second you try to start a bake or broil cycle.
  • Oven won't heat at all. You set it to 350, the element glows for maybe 30 seconds, then everything cuts out and the code appears.
  • Self-clean cycle aborted partway through and now you've got a code. The oven door might still be locked too, which is a whole other headache.
  • Sometimes you'll see the oven temperature reading jump to something crazy like 999 degrees right before the code triggers.
  • Intermittent F4 that clears on its own but keeps coming back, usually getting more frequent over a few weeks before it becomes permanent.

Can you reset a Ge oven to clear the F4 code?

After you swap the sensor, restore power at the breaker and wait about 30 seconds. The code should clear on its own. If it doesn't, press the Clear or Cancel button once. If the F4 comes right back within a few seconds of hitting start, the new sensor is either defective out of the box (happens maybe 5% of the time) or your control board is actually the problem. Try unplugging the oven for 5 minutes before giving up.

Tools Required for Diagnosis

Phillips #2 screwdriver1/4 inch nut driverMultimeter with ohms settingWork glovesFlashlightNeedle-nose pliers (for stuck connectors)

Diagnostic Checklist

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

ComponentComponent Under Test
Expected Range1080–1100 ohms
ConditionIf Open (OL) or infinite, replace component.

Frequently Asked Questions

Can I still use my GE oven if it shows an F4 code?
Nope, don't try it. The whole point of that code is a safety lockout because the oven literally can't tell how hot it is inside. Without sensor feedback the oven could just keep heating past your set temp with no idea it's doing it. You're talking potential fire or at minimum a totally ruined meal and a very unhappy kitchen. Just order the part, it's like $25-50, it's not worth gambling.
Why did my GE oven show F4 after a self-clean cycle?
Super common. Self-clean runs the oven up to 900 degrees or higher to burn everything off, and that's absolutely brutal on the sensor. If the sensor was already getting weak, that cycle is basically the death blow. I probably see this specific scenario four or five times a month. The good news is it's a really clean diagnosis because you know exactly what triggered it. Replace the sensor, you're done.
How much does it cost to fix an F4 error code?
DIY? Figure $20-60 for the sensor depending on your model. Takes maybe 20 minutes once you've done it once. If you call a tech, you're looking at $150-250 total when you add in the service call fee plus labor plus the part marked up. It's genuinely one of the better DIY repairs because there's almost no way to screw it up. Two screws, one connector, done.
Is the F4 code the same as the F3 code on GE ovens?
Almost identical repair. Technically F3 is an open sensor circuit (infinite resistance) and F4 is a shorted sensor (zero or near-zero resistance), but practically speaking you diagnose and fix them exactly the same way. Same sensor, same steps, same multimeter test. If you searched for F3 and landed here you're in the right place.
What's the part number for the GE oven temperature sensor?
The most common GE oven sensor is WB21X5243 and it fits a huge range of GE, Hotpoint, and older Profile models. But don't just order that one blindly. Pull your full model number off the sticker inside the door frame or on the back of the unit and cross-reference it. Some of the newer GE Profile and Cafe ranges use a slightly different sensor. Takes 30 seconds on any appliance parts site to confirm the right one.
My F4 code comes and goes, is the sensor dying?
Yeah, that intermittent behavior is a classic sign of a sensor on its way out. The resistance is drifting in and out of range as it heats and cools. It'll get worse over time until it stays on permanently. Honestly I'd just replace it now before it fails completely at the worst possible time, like Thanksgiving morning. You've already done your diagnosis.

Models Known to Experience F4 Errors

This repair applies to most Ge ovens with this error code. Common model numbers include:

JB735SPSS, JGB700SEJSS, JGS760SPSS, PB980SJSS, JB645RKSS, JS750SFSS, JT5000SFSS, JK3800DHWW

MS

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on March 17, 2026