LG Cooktop Error Code F5

F5 on an LG cooktop means the control system is receiving no signal feedback from the front right cooking zone's induction heating module. The cooktop detects that communication with that zone has been lost and disables it to prevent unsafe operation. The first place to check is connector CN01 on the front IH module, which is the most common source of the fault.

The front right zone will be disabled when F5 is active, so you will not be able to use that burner. The remaining zones may continue to function, but operating the cooktop with an unresolved fault is not recommended. It is best to diagnose and repair the underlying cause before relying on the unit for regular cooking.

If the fix is simply reseating the CN01 connector, your cost may be minimal, covering only a service call fee, which typically ranges from $75 to $150. If the IH module needs replacement, parts and labor combined can range from $200 to $450 depending on your location and the specific model. A main control board replacement is generally the most expensive repair, often falling in the $300 to $600 range with labor included.

If the cause is a loose CN01 connector, reseating it is a straightforward repair that a confident DIYer can perform after unplugging the cooktop and accessing the underside of the unit. However, if the connector is damaged, the wiring harness is broken, or the IH module or control board has failed, those repairs involve handling high-voltage components and are best handled by a qualified appliance technician.

Powering the cooktop off at the circuit breaker for a minute and restoring power may temporarily clear the F5 code if the fault was caused by a transient signal issue. However, if there is an actual hardware problem such as a loose connector, damaged wiring, or a failed IH module, the error will return once the cooktop tries to operate the front right zone again. A reset is not a substitute for diagnosing the root cause.