GE Oven Temperature Sensor Replacement — Fixing F3/F4 Codes and Temperature Problems
The temperature sensor in your GE oven is a resistance temperature detector (RTD) probe that tells the control board how hot the oven cavity is. The board uses this reading to cycle the heating elements on and off to maintain the set temperature. When the sensor fails, the oven either overheats, underheats, or displays F3/F4 error codes.
Testing the Sensor
At room temperature (approximately 70 degrees F), a GE oven temperature sensor should read approximately 1,080 ohms. This is the definitive test:
- Turn off the breaker
- Locate the sensor inside the oven — a thin metal probe extending from the upper rear wall
- Disconnect the sensor wire at the back of the oven
- Measure resistance across the two sensor leads
- ~1,080 ohms at room temp = sensor is good; problem is elsewhere
- Open circuit (OL) = sensor wire is broken; replace sensor (triggers F3)
- Near zero ohms = sensor is shorted; replace sensor (triggers F4)
Do You Have the Right Tools?
Multimeter ($85), vacuum pump ($250), diagnostic software, and specialized hand tools. Our technician arrives with $15K+ in professional tools — your diagnostic is free.
Licensed & Insured · 90-Day Warranty · Same-Day Service
Part Numbers and Pricing
| Component | Part Number | Cost |
|---|---|---|
| OEM temperature sensor | WB21X33556 | $15-$45 |
| OEM sensor (older) | WB21X5301 | $12-$35 |
| Aftermarket sensor | Varies | $8-$22 |
| Professional installation | — | $80-$140 |
Step-by-Step Replacement
Safety
Turn off the breaker. Allow the oven to cool.
Accessing the Sensor
Inside the oven, the sensor probe extends from the upper rear wall of the cavity. It is held by one mounting screw. On the outside, the wire connector passes through the rear wall to a plug on the board harness.
Removal
Remove the mounting screw inside the oven. Gently pull the sensor probe out. From the back of the oven, disconnect the wire plug.
Installation
Connect the new sensor wire plug at the back. Feed the probe through the rear wall opening into the oven cavity. Secure with the mounting screw. The probe should extend into the cavity without touching any walls or racks.
Testing
Restore power. Set the oven to 350 degrees F. It should reach temperature within 15-20 minutes without F-code errors. Verify with an oven thermometer — should read within +/- 25 degrees F of the setting.
Same-Day Appliance Repair
Fixed or It's Free
$89 → $0 Service Call & Diagnosis — offer ends May 25
Safety First — Know the Risks
Appliances involve high voltage (120-240V), pressurized water, gas lines, and chemical refrigerants. Over 400 DIY repair injuries are reported yearly. Our techs are licensed and insured — let them handle the risk.
Licensed & Insured · 90-Day Warranty · Same-Day Service
Sensor vs Board
If F3/F4 codes persist after sensor replacement, the issue is the control board — specifically the sensor input circuit on the board. The board cannot read the sensor even though the sensor itself is good. At this point, board replacement ($120-$280) is needed.
F3 and F4 errors are usually a $15-$45 sensor, not a $280 board. Our technicians test the sensor on-site before recommending parts. Book a repair
