LG Heat Pump Error Code E159

E159 indicates a no-fan error related to the electric heater circuit. The control board has detected that the fan required to move air across the electric heating elements is not operating correctly. The system shuts down the heater as a safety precaution to prevent overheating. A technician should inspect the blower motor, capacitor, wiring, and control board to identify the root cause.

The heat pump will disable the electric heater when E159 is active, which is a built-in safety response to prevent overheating. While the refrigerant-based heating mode may still function depending on the system configuration, running the unit without resolving the fan fault is not advisable. Continuing to operate the system in a faulted state can stress other components and delay a proper diagnosis.

A power reset may temporarily clear the E159 code and allow the system to attempt another heating cycle, but if the underlying fan fault still exists, the error will return. Resetting without repairing the root cause does not fix the problem and can mask symptoms that are useful for diagnosis. A proper repair of the fan motor, capacitor, wiring, or control board is necessary for a lasting resolution.

Some basic checks, such as inspecting for visible obstructions in the blower wheel or checking for loose wiring connections, can be done by a knowledgeable homeowner. However, testing motor windings, measuring capacitance, and diagnosing control board faults require proper tools and electrical knowledge. Working around electric heating elements and live voltage also carries safety risks, so professional service is recommended for most repairs.

Repair costs vary depending on the failed component. A run capacitor replacement is typically the least expensive fix, often ranging from $75 to $200 including labor. A blower motor replacement generally costs between $200 and $500 depending on the motor and labor rates in your area. A control board replacement tends to be the most expensive repair, often ranging from $300 to $700 or more.