LG Oven Error Code F-3

The F-3 code on an LG oven indicates a touch sensor key error. Specifically, the oven's control system has detected an abnormal or continuous signal from the touch keypad for 60 seconds or more. This points to a problem in the touch panel circuitry, the wiring connecting the KEY PCB to the MAIN PCB, or the boards themselves.

The F-3 error indicates the touch control system is not operating reliably, which means the oven may not respond correctly to input commands. It is best to avoid using the oven until the fault is resolved, as unpredictable control behavior can create safety concerns. Power the oven off at the breaker until the issue is diagnosed and repaired.

Repair costs vary depending on the failed component. If only a connector reseat or cleaning is needed, there may be no parts cost at all, though a service call fee typically ranges from $75 to $150. Replacing the KEY PCB generally adds $50 to $200 in parts, while a MAIN PCB replacement can add $150 to $400 or more depending on the specific model. Getting a diagnostic estimate before authorizing repairs is always advisable.

Some causes of F-3 are DIY-friendly, such as reseating a loose connector at KEY PCB CN01 or MAIN PCB CN603, or cleaning a contaminated touch surface. However, replacing the KEY PCB or MAIN PCB involves working inside the oven's control cavity and requires comfort with electronics and appliance disassembly. If you are not experienced with appliance repair, a qualified technician is recommended for board-level repairs.

Resetting the oven by cutting power at the circuit breaker for a few minutes may temporarily clear the F-3 code, but the error will return if the underlying hardware fault is still present. A reset is a useful first step to confirm whether the fault is intermittent, but it is not a permanent fix. The connector, harness, and KEY PCB should still be inspected after a reset.