Kenmore Oven F3 Error Code — What It Means
The F3 code on a Kenmore oven signals an oven temperature sensor probe fault. The electronic control board cannot get a valid reading from the sensor circuit, which means the problem is in the sensor probe itself, the wiring harness that connects it to the control board, or the control board that reads the signal. This is not a bake element or ignition problem. The oven will not heat properly or may refuse to start until the fault is cleared.
Common Causes
- Failed oven temperature sensor probe The sensor is out of specification, open circuit, or otherwise not reporting temperature correctly to the control board.
- Damaged or loose sensor wiring Wiring between the probe and the control board is broken, burned, shorted, or the connector has come loose or corroded.
- Defective electronic control board If the sensor and wiring both test good, the control board that interprets the sensor signal has failed.
- Connector mismatch on replacement sensor Some Kenmore models require an adapter lead because the original harness connector does not match newer replacement sensors.
Step-by-Step Fix
- Disconnect power at the circuit breaker or unplug the range completely before starting any work.
- Access the oven temperature sensor by removing the back panel or top of the range to reach the wiring harness and control board connections.
- Disconnect the sensor probe connector and measure resistance across the sensor terminals with a multimeter set to ohms. A good thermal probe typically reads around 1.0 to 1.1 kΩ at room temperature, though you should consult your model’s service sheet for the exact range.
- Check wiring continuity from the probe connector to the control board connector if the sensor resistance is in range. Look for breaks, burns, or loose pins in the harness and repair or replace damaged wiring.
- Replace the oven temperature sensor probe if it reads open, shorted, or far out of the expected resistance range. Match the connector type or use an adapter lead if needed for your model.
- Replace the electronic control board if both the sensor and wiring test normal but the F3 code persists after reconnecting power and running a test cycle.
- Restore power and run a bake cycle to verify the F3 code clears and the oven heats to the correct temperature.
Parts Often Needed
| Part | Notes |
|---|---|
| Oven temperature sensor probe | Amazon | Match to your Kenmore model number. May require an adapter connector on some models. |
| Sensor wiring harness or connector | Amazon | Only if the original harness is burned, broken, or corroded beyond repair. |
| Electronic control board (oven controller) | Amazon | Replace only after confirming the sensor and wiring are good. Match your model and serial number exactly. |
When to Call a Pro
If you are uncomfortable working with electrical connections or do not own a multimeter, call a qualified appliance technician. If you replace the sensor and wiring but the F3 code returns, control board diagnosis and replacement require experience with component-level testing and can be expensive, so a professional estimate is worthwhile. Gas ranges also involve gas line work if you need to move the unit for access, and that should always be handled by a licensed technician.