LG Cooktop Error Code F8

The F8 error code means the cooktop's control system is not receiving any signal feedback from the rear left induction cooking zone. The cooktop monitors each zone through its dedicated IH module, and when communication is lost, it displays F8 and disables the affected zone. The issue typically points to a wiring or connector problem at the rear IH module, specifically at connector CN01.

The rear left cooking zone will be disabled while the F8 error is active, so you should not attempt to use that specific burner. The remaining zones may still function, but continued use of the cooktop in a faulted state is not recommended. It is best to have the unit inspected and repaired before relying on it for regular cooking.

Repair costs vary depending on whether the fix is a simple connector reseating or requires a component replacement. A connector cleaning or reseating is typically part of a standard diagnostic service call, which can run anywhere from $75 to $150. If the rear IH module needs replacement, total parts and labor costs can range from $150 to $400 or more depending on the specific model and local labor rates.

A reset may temporarily clear the F8 code, but if the underlying fault is still present, the error will return when the cooktop tries to use the rear left zone again. Resetting is not a fix on its own. The connector, wiring, and IH module need to be physically inspected and repaired to resolve the fault permanently.

Start by checking connector CN01 on the rear IH module to ensure it is fully seated and free of corrosion or damaged pins. If the connector is secure and undamaged, inspect the wiring harness between the IH module and the main control board for any breaks or shorts. If the wiring and connector are both in good condition, the rear left IH module itself likely needs to be replaced. A qualified appliance technician can perform these checks safely.