F3LG Oven — LG Oven F3 Error Code
Temperature sensor open circuit
Severity
Critical
Difficulty
Moderate
Est. Cost
What's Happening
The oven temperature sensor has an open circuit — the sensor or its wiring is disconnected. The oven won't heat with this error because it can't monitor temperature at all.
How to Fix It
Turn off power at the breaker. The sensor probe is usually at the top rear of the oven cavity. Check that its wire connector hasn't come loose. If the connection is secure, the sensor has failed — test with a multimeter (should show a finite resistance, not infinite). Replace if open.
Frequently Asked Questions
What does F3 mean on an LG oven?
F3 means the temperature sensor has an open circuit — it's either disconnected or broken. The oven won't heat until this is fixed.
Can a loose wire cause an LG oven F3 error?
Yes. The sensor connector at the back of the oven cavity can vibrate loose over time. Check the connection first — it might just need to be plugged back in.
How do I replace an LG oven temperature sensor?
Unplug the range, remove the rear access panel, disconnect the old sensor's wire connector, unscrew it from the oven cavity, and install the new one. It's one of the simpler oven repairs.