GE Range F20 Error Code — What It Means
The F20 error code on a GE range means the control has detected that the oven temperature exceeded a preset safety threshold. GE groups F2 and F20 together in their fault-code documentation and defines them as indicating that for an unknown reason, the oven temperature has gone beyond safe limits. This is an over-temperature condition rather than a simple keypad or user-input problem.
The code can appear during normal baking, roasting, or self-clean cycles. It represents the control board’s attempt to shut down heating before damage occurs. GE states that these fault codes are intended to help trained service technicians diagnose the range or wall oven and that a qualified technician should diagnose and correct the issue.
Common Causes
- Failed oven temperature sensor The sensor probe inside the oven cavity has drifted out of specification or failed, sending incorrect readings to the control board that trigger an over-temperature fault.
- Control board misreading or malfunction The electronic oven control has damaged solder joints, a failing relay, or internal faults that cause it to falsely detect over-temperature or drive continuous heat.
- Stuck heating relay A relay or solid-state component on the control board has welded closed or stuck in the on position, preventing the control from turning off the bake or broil element.
- True overheating event The oven genuinely exceeded safe temperature due to airflow blockage, a shorted element, or runaway heating during self-clean mode.
Step-by-Step Fix
- {‘text’: ‘Kill power at the breaker or unplug the range, then wait three to five minutes before restoring power to attempt a control reset and see if the F20 code clears.’}
- {‘text’: ‘Check if the code returns during the next bake cycle or at power-on. If it reappears immediately or during heating, proceed with component testing.’}
- {‘text’: ‘Locate and remove the oven temperature sensor from the rear wall of the oven cavity. Disconnect the two-wire harness connector behind the range back panel.’}
- {‘text’: ‘Test sensor resistance with a multimeter across the sensor terminals. A good sensor typically reads 1,080 to 1,090 ohms at room temperature. A reading above 1,090 ohms or open circuit indicates a defective sensor.’}
- {‘text’: ‘Replace the sensor assembly if the resistance is out of range. Reinstall the mounting bracket, reconnect the harness, restore power, and test the oven through a bake cycle.’}
- {‘text’: ‘Inspect the electronic control board if the sensor tests good and the fault persists. Look for burned relays, damaged solder joints, or signs of arcing on the board.’}
- {‘text’: ‘Replace the electronic oven control if board inspection reveals damage or if all other components test good and the F20 code continues to trip during operation.’}
Parts Often Needed
| Part | Notes |
|---|---|
| GE oven temperature sensor | Amazon | Verify part number by model tag. Sensor probe mounts through rear oven wall with a bracket and two-wire connector. |
| GE electronic oven control board | Amazon | Match the control board part number exactly to your range model. Board usually mounts behind the back panel or under the cooktop. |
When to Call a Pro
GE explicitly states that F2 and F20 codes require a trained service technician to diagnose and repair. If you are not comfortable working with live 240-volt circuits, testing components with a multimeter, or removing the range back panel and control board, call a qualified appliance technician. If the sensor tests good and the fault persists, further diagnosis involves inspecting and potentially replacing the control board, which carries risk of electric shock and requires proper handling of sensitive electronic components. A pro can also access GE service mode diagnostics and wiring schematics for your specific model.