LG Cooktop Error Code F7

F7 on an LG cooktop indicates a rear inverter heat sink thermistor fault. The cooktop's control system is not receiving a valid temperature signal from the thermistor mounted on the rear induction module's heat sink. As a result, the rear cooking zone is disabled until the fault is corrected. The first place to check is connector CN02 on the rear IH module.

When F7 is active, LG's cooktop disables the affected rear cooking zone, so you cannot use that burner. Other zones may remain operational, but it is best to have the fault diagnosed promptly. The thermistor is part of the thermal protection system, so operating the unit with a known sensor fault is not advisable.

Repair costs depend on the root cause. If only the connector needs reseating, the cost is minimal, primarily a service call fee ranging from roughly $75 to $150. Thermistor replacement parts are generally inexpensive, though labor adds to the total. If the rear inverter IH module requires replacement, parts and labor combined could range from $200 to $450 or more depending on the specific model and your location.

Some cases of F7 can be resolved by a knowledgeable DIYer, particularly if the cause is simply a loose connector at CN02 on the rear IH module. However, if the thermistor itself or the inverter board needs replacement, the repair involves working with high-voltage induction electronics and should be handled by a qualified technician. Always disconnect power to the cooktop completely before inspecting any internal connections.

Cycling power to the cooktop may temporarily clear the F7 display, but the fault will return if the underlying issue with the rear heat sink thermistor or its wiring is not corrected. A reset does not repair a failed thermistor, damaged wiring, or a faulty connection at CN02. Proper diagnosis and repair are needed for a lasting resolution.