Kenmore Oven/Range Error Code F3 — Oven Temperature Sensor Open/Short
What this means
The F3 error code on Kenmore ovens and ranges indicates the oven temperature sensor (RTD) has an open or shorted circuit. This is similar to F1 but specifically indicates the sensor or its wiring is electrically disconnected (open) or has a short circuit. The oven cannot operate safely without temperature feedback and will not heat.
Step-by-step fix
4 stepsReset the control and check for a temporary issue
Turn off the breaker for 5 minutes and restore power. If the error was caused by a loose connection that has since resettled, it may clear. Monitor for a few cycles.
If the error clears after a reset but returns intermittently, the problem is likely a loose connector rather than a failed sensor.
Test the temperature sensor
Turn off the breaker. Open the oven and remove the temperature sensor (the thin rod at the top rear of the oven cavity, held by two screws). Disconnect the wire harness and measure resistance. At room temperature, it should read approximately 1,080–1,100 ohms. An open reading (infinite) or zero reading (short) confirms the sensor is bad.
For an F3 code specifically, an open (infinite) reading is most common — the sensor element has broken internally.
Check the wiring harness
If the sensor tests good, the problem may be in the wiring between the sensor and the control board. Trace the wires from the sensor connector to the board and look for pinched, burned, or broken wires. Test continuity through each wire.
On ranges with a drawer or broiler below, the sensor wires can get pinched or damaged by the drawer sliding — check this area carefully.
Replace the sensor or repair wiring
If the sensor is faulty, replace it. If a wire is broken, splice and solder the repair, insulating with heat-shrink tubing. Reassemble and test by preheating to 350°F.
After replacing the sensor, you may need to recalibrate the oven temperature — check your owner's manual for the calibration procedure.
When to call a professional
If the sensor and wiring both test good, the control board's sensor input circuit is likely damaged. Board replacement requires working with high-voltage wiring and should be done by a professional.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
Oven Temperature Sensor (RTD)
Part #WB21X5301 · $10–$25
Required if sensor reads open or shorted
Links may earn us a commission at no extra cost to you. We only recommend parts relevant to this repair.