Lg Oven Error F3

DIY Fix Basic user troubleshooting for F3

1. Turn off and unplug the oven or switch off circuit breaker for at least 30 seconds, then restore power to see if the F3 error clears.
2. Clean the control panel gently with a soft dry cloth to remove any debris or residue that could trigger false keypad/communication faults.
3. Check that the oven was not in self‑clean or unusual mode when the error appeared; reset and retry normal operation.

Technician Only Technician‑level diagnosis and repair for F3

1. Disconnect power to the oven and access the internal oven temperature sensor (usually at the back wall of the cavity).
2. Test the oven temperature sensor’s resistance with a multimeter at room temperature.
3. Inspect wiring harness and connectors between the sensor and control board for damage, loose connections, or short circuits.
4. If sensor and wiring are good, examine control board and keypad interface for signs of damage or abnormal readings; replace defective parts as needed.

Parts needed: Oven temperature sensor, Wiring harness/connectors, Control board or keypad assembly (if needed)