GE Oven F20 Error Code — What It Means
The F20 code (sometimes displayed as F2) means your GE oven’s control board has detected that the cavity temperature exceeded a preset safety threshold. GE’s official documentation defines this as an overtemperature fault. The control shuts down heating to prevent damage or unsafe conditions. In practical terms, the oven either actually overheated or the control received a faulty temperature reading that made it think the oven was too hot.
This fault can appear during normal baking, broiling, or a self-clean cycle. It does not always mean your oven physically overheated. A failed temperature sensor or a control board relay that stuck closed and kept the heating element energized are the two most common root causes. Wiring problems or a temporary control glitch can also trigger the code.
Common Causes
- Failed oven temperature sensor The sensor probe inside the cavity sends resistance signals to the control board, and if it drifts out of specification or reads erratically the board interprets it as dangerous overheating and throws F20.
- Stuck or fused relay on the electronic control board The bake or broil relay contacts can weld closed from repeated high-current switching, leaving the heating element energized continuously and causing a real overheat condition.
- Wiring or harness fault between sensor and control Loose connectors, damaged wires, or corrosion at the sensor plug can create intermittent or incorrect resistance readings that the board flags as overtemperature.
- Temporary control board glitch Static discharge, power surges, or firmware hiccups can store a false fault in memory, and cycling power at the breaker may clear the code if no hardware fault exists.
Step-by-Step Fix
- {‘lead’: ‘Turn off power at the circuit breaker’, ‘text’: ‘Shut off the dedicated breaker for the range or wall oven and wait two full minutes to let the control board reset, then restore power and check whether the F20 code reappears.’}
- {‘lead’: ‘Access the oven temperature sensor’, ‘text’: “Open the oven door and locate the metal sensor probe mounted on the rear wall of the cavity, then pull the oven away from the wall and remove the rear access panel to reach the sensor’s wire connector.”}
- {‘lead’: ‘Disconnect the sensor harness and measure resistance’, ‘text’: “Unplug the two-wire connector from the sensor, set your multimeter to the ohms scale, and measure across the sensor’s two terminals at room temperature to get a baseline reading.”}
- {‘lead’: ‘Compare your reading to the model specification’, ‘text’: “Consult your oven’s service sheet or tech data sticker for the correct resistance range at room temperature (one common example is around 1,080–1,090 Ω, but this varies by model), and replace the sensor if it reads open, shorted, or far out of spec.”}
- {‘lead’: ‘Inspect the electronic control board for relay damage’, ‘text’: ‘If the sensor tests good, remove the control board from the back panel or console, flip it over, and look for burned or fused contacts on the bake and broil relays, darkened solder joints, or melted plastic near the relay terminals.’}
- {‘lead’: ‘Check all wiring and connectors for integrity’, ‘text’: ‘Trace the sensor harness from the cavity to the control, wiggle each connector to reveal intermittent contact, and repair or replace any corroded pins or damaged insulation.’}
- {‘lead’: ‘Reassemble and run a monitored test cycle’, ‘text’: ‘After replacing the sensor or control board, restore power, set the oven to bake at 350°F, and monitor the display for fifteen minutes to confirm the F20 code does not return and the oven heats normally.’}
Parts Often Needed
| Part | Notes |
|---|---|
| Oven Temperature Sensor | Amazon | Order by your model number; verify the connector type and probe length match the original. |
| Electronic Oven Control Board | Amazon | Replace when relays are fused or board shows burn damage; confirm board part number on the original label. |
When to Call a Pro
Call a qualified appliance service technician if you are not comfortable working with 240-volt circuits, if you cannot safely access the rear of a built-in wall oven, or if the sensor and wiring both test good but the code persists. GE specifically recommends professional diagnosis for F2 and F20 faults because they can indicate a real overheat hazard. A technician has the model-specific resistance tables, line-voltage test procedures, and replacement control boards needed to resolve intermittent overtemperature faults safely. If your oven is still under warranty or part of a recall campaign, contact GE Appliances service before opening any panels.