LG Cooktop Error Code F6

F6 on an LG cooktop indicates a rear right top thermistor fault. The cooktop has detected that the temperature sensor for the rear right burner zone is reading outside its expected resistance range. The affected zone is typically disabled until the fault is resolved. Diagnosis starts with checking connector CN 03 on the Right Module and measuring the thermistor resistance, which should be 500 to 550 K ohms at room temperature.

The F6 code typically disables the rear right burner zone, so that specific area should not be used while the fault is active. Other zones on the cooktop may continue to function normally. It is not advisable to attempt to override or ignore the fault, as the thermistor plays a key role in preventing overheating in that zone.

Resetting the cooktop by powering it off at the breaker for a few minutes may temporarily clear the F6 code, but the fault will return if the underlying problem is not fixed. The thermistor or its circuit has a measurable fault that the control board will detect again on the next cycle. A reset is useful for confirming whether the fault is intermittent, but it is not a substitute for proper diagnosis and repair.

A knowledgeable DIYer comfortable working with appliance electronics can perform the basic diagnostic steps, including checking the CN 03 connector and testing thermistor resistance with a multimeter. If the thermistor or wiring is the issue, replacing those components is manageable with the right parts. However, if the Right Module or control board is at fault, professional repair is recommended due to the complexity and cost of those components.

Repair costs vary depending on the root cause. A replacement thermistor is generally an inexpensive part, typically in the range of $15 to $50 for the component. If the Right Module or control board needs replacement, parts alone can range from $80 to $250 or more. Adding professional labor, total repair costs can fall anywhere from $100 to $400 depending on the diagnosis.