LG HVAC Error Code 26

Error code 26 on an LG HVAC system means the inverter compressor is seized or is not rotating. The inverter board, which controls compressor speed, has detected that the compressor motor is not spinning or cannot confirm that rotation is occurring. The system shuts down automatically to prevent damage to the compressor and inverter components.

No. Error code 26 indicates the compressor is not rotating, and the system should already be in a protective shutdown state. Attempting to force the system to run with a seized or faulted compressor risks damaging the inverter board, burning compressor windings, and causing refrigerant system pressure faults. Leave the system off and contact a qualified technician.

Repair costs vary significantly depending on the cause. If the fix is a wiring connection or a refrigerant restriction such as a clogged strainer, costs may range from a few hundred dollars for labor and parts. If the inverter board has failed, board replacement typically runs in the several-hundred-dollar range. A seized or electrically faulted compressor is the most expensive outcome, with compressor replacement on an inverter system commonly ranging from one thousand to several thousand dollars depending on system size, refrigerant type, and labor rates in your area.

Some causes of error code 26, such as loose wiring connections at the compressor terminals, can be inspected by a knowledgeable DIYer. However, diagnosing this code properly requires measuring three-phase winding resistance, testing inverter board output voltage, and evaluating refrigerant system pressures, all of which require specialized tools and, in the case of refrigerant work, EPA certification. Compressor replacement is a refrigerant-system repair that must be performed by a licensed technician.

A power reset may temporarily clear the fault and allow a restart attempt, but if the underlying cause is a seized compressor, a faulted winding, or a refrigerant restriction, the code will return quickly, often within the first few seconds of the next start attempt. Resetting without diagnosing the root cause does not fix the problem and can cause additional damage.