LG Cooktop Error Code F1

The F1 code on an LG cooktop indicates a fault with the front left top thermistor. The thermistor is a resistance-based temperature sensor, and the control board has detected that the reading from this sensor is outside the normal range of 500 to 550 K ohms at room temperature. The cooktop typically disables the front left zone until the fault is resolved.

It is not recommended to continue using the affected cooking zone while the F1 error is active. The error means the cooktop cannot reliably monitor the temperature of the front left burner, which removes a key safety protection. Other zones may still function normally, but the front left zone should be considered out of service until the fault is diagnosed and repaired.

Repair costs vary depending on the root cause. Thermistor replacement parts typically range from around 20 to 80 dollars, while a control module can be considerably more expensive. Adding a technician's labor, total repair costs generally fall somewhere between 100 and 350 dollars depending on your location and the specific parts required.

A knowledgeable DIYer comfortable with electrical testing can begin by checking connector CN 03 on the left module for loose or corroded pins and measuring the thermistor resistance with a multimeter. If the thermistor reads outside 500 to 550 K ohms, replacing the sensor is the likely fix. However, working inside a cooktop involves electrical components that can pose a shock hazard, so unplugging the unit before any inspection is essential, and complex repairs are best handled by a qualified technician.

A power reset by unplugging the cooktop or switching off the circuit breaker for a few minutes may temporarily clear the F1 code, but if the underlying thermistor or wiring fault is still present, the error will return once the unit powers back on. A permanent fix requires testing and, if necessary, replacing the thermistor or repairing the wiring at CN 03.