LG Range Error Code F1

F1 on an LG range means the control board has detected a key on the keypad that appears to have been held down or shorted continuously for more than 60 seconds. The range flags this as a fault to prevent unintended cooking functions from activating. The source of the problem is typically in the keypad membrane, the ribbon cable, or the CN11 connector on the main PCB.

Start by unplugging the range and disconnecting the keypad tail connector from the main PCB at connector CN11, then restore power. If the F1 code does not return, the keypad assembly or its ribbon cable is the source and will need to be inspected or replaced. If F1 persists with the keypad disconnected, inspect CN11 on the main PCB for bent pins, solder bridges, or debris causing a pin-to-pin short, and clean or repair as needed.

Repair costs depend on which component has failed. A replacement keypad or control panel overlay typically costs in the range of $30 to $120 for parts alone. If the main PCB requires replacement, parts costs generally range from $100 to $300 or more depending on the specific model. Adding professional labor will increase the total, so obtaining a diagnostic estimate from a certified technician before committing to a repair is advisable.

Unplugging the range will clear the active display of the F1 code, but the error will return as soon as the faulty component is detected again on power-up. A reset is useful as a first diagnostic step to confirm the fault is real and repeatable, but it does not fix the underlying short in the keypad or control board circuit.

The F1 error is a protective fault code designed to prevent uncontrolled range operation caused by a stuck or shorted key. While the error itself is a safety feature, you should not continue using the range until the fault is resolved, as the underlying short could potentially trigger unintended burner or oven activation. Unplug the appliance until the repair is completed.