Error code guide
LG ranges and wall ovens show an F-code when the control detects a problem with a sensor, the keypad, the convection fan, heating or the door lock. On double-oven models, some faults have a second code for the lower oven — for example F9 and F19, or F10 and F20. Codes vary by model, so check your manual too.
| Code | Meaning |
|---|---|
| F1 / F2 | Oven temperature sensor (thermistor) error — the sensor reads open or shorted. |
| F3 | Touch-pad key error — a key reads as continuously pressed. |
| F7 / F17 | Convection fan error — the fan isn't detected running. |
| F9 / F19 | Oven not heating properly — temperature isn't rising as expected. |
| F10 / F20 | Door lock failure — F10 for the upper or single oven, F20 for the lower oven. |
| F11 | Communication error between the control boards. |
| F27 | Cooling fan stalled or locked during self-clean. |
| PF | Power failure — power to the range was interrupted. |
Oven temperature sensor (thermistor) error — the sensor reads open or shorted.
When to call: Usually the sensor itself — a moderate, single-visit repair.
Touch-pad key error — a key reads as continuously pressed.
When to call: If F3 returns, the keypad or control needs replacing.
Convection fan error — the fan isn't detected running.
When to call: A failed convection fan motor is a common, moderate repair.
Oven not heating properly — temperature isn't rising as expected.
When to call: Needs a technician to test the heating circuit.
Door lock failure — F10 for the upper or single oven, F20 for the lower oven.
When to call: If the door won't lock or unlock, the lock assembly needs service. Don't force the door.
Communication error between the control boards.
When to call: Needs a technician to check the connections and boards.
Cooling fan stalled or locked during self-clean.
When to call: The cooling fan protects the electronics — have it repaired before running self-clean again.
Power failure — power to the range was interrupted.
When to call: No service needed unless PF keeps appearing without an outage.
Press Clear/Off first. If the code comes back, switch off the range's breaker for 30 seconds, then restore power. A code that keeps returning needs service.
Codes vary by model and year. Check your owner's manual for your exact model — if a code isn't listed here, call us and we'll look it up.
Still stuck? We repair LG ovens across Clearwater and all of Pinellas County — see LG repair.
Last reviewed 2026-10-07 by Mako Appliance Repair.
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