LG Air Conditioner Error Code CH26

CH26 indicates a DC compressor position error, which means the inverter control board cannot properly detect the rotational position of the compressor motor. This is most commonly caused by a wiring connection problem between the board and the compressor. The system shuts down the compressor to prevent mechanical damage until the fault is resolved.

No. CH26 causes the unit to shut down the compressor as a protective measure, so the system will not cool effectively while the fault is active. Attempting to force the system to run with an unresolved compressor wiring or position fault risks damaging the compressor or inverter board, both of which are expensive components. The unit should remain off until the fault is diagnosed and corrected.

Repair costs vary significantly depending on the root cause. If the fix is simply reseating or replacing a wiring harness, costs are generally in the range of $100 to $300 including labor. A failed inverter control board typically runs $200 to $600 or more in parts and labor. Compressor replacement is the most expensive outcome, often ranging from $700 to $1,500 or higher depending on unit size and labor rates.

A homeowner with some technical confidence can inspect the compressor wiring harness for visible damage, loose connectors, or corrosion and reseat connections. However, testing compressor winding resistance, diagnosing inverter board faults, and working around refrigerant lines and high-voltage inverter components carries real safety risk. For anything beyond a visual inspection and connector check, a qualified HVAC technician is recommended.

A power reset may temporarily clear the fault code, and the unit may attempt to restart. However, if the underlying cause such as a loose connection, damaged wire, or failed component is still present, the CH26 error will return quickly. A reset is useful as a diagnostic step but is not a fix for the underlying problem.