LG Oven Error Code F-6

The F-6 code means the upper oven temperature exceeded 650°F (343°C) continuously for two or more minutes during a cooking cycle. This is a thermal runaway fault, most commonly caused by a welded relay on the relay PCB that keeps a heating element energized when it should be off. The oven shuts down as a safety precaution when this condition is detected.

Resetting the oven by cycling power may temporarily clear the F-6 code, but it will not fix the underlying problem. If a relay contact is welded shut, the heating element will continue to stay on uncontrolled during the next cooking cycle and the fault will return. A proper repair requires inspecting and testing the relay PCB and its harness connections.

Repair costs vary depending on what component has failed. A relay PCB replacement part typically ranges from around $80 to $200 or more depending on the specific model. If you hire a technician, labor charges will add to the total cost, generally bringing the repair into the $150 to $400 range. Diagnosing the fault yourself before calling a technician can help confirm which part needs replacement and avoid unnecessary costs.

No, the oven should not be used while displaying an F-6 error. This fault indicates an uncontrolled overtemperature condition where a heating element may be running continuously without proper regulation. Continued use poses a fire and damage risk. Disconnect power to the appliance until the fault is diagnosed and repaired.

Start by disconnecting power, then remove the relay PCB harness and test the heater relays at L1 (TAB1 pin 18 and TAB6 pin 20) and all other heater relay contacts using a multimeter. A properly functioning relay will show infinite resistance when de-energized. Any relay showing continuity has welded contacts and the relay PCB will need to be replaced. If all relays test correctly, inspect the harness for shorts or damaged wiring.