LG Air Conditioner Error Code CH29

CH29 indicates a compressor phase over-current fault. The inverter control board has detected that electrical current in one or more of the compressor motor phases exceeded the safe operating limit and shut the system down to prevent damage. Common triggers include blocked airflow, refrigerant issues, a closed service valve, or a wiring fault at the compressor.

No. The unit will typically shut itself down when CH29 is active, which is the correct protective response. Attempting to bypass the fault and run the system with an overcurrent condition risks burning out the compressor motor windings or damaging the inverter drive board, both of which are expensive repairs. Leave the unit off until the root cause is identified and corrected.

Repair costs vary widely depending on the cause. A simple refrigerant adjustment or airflow correction may cost in the range of $100 to $300 including a service call. Compressor wiring repairs typically fall in the $150 to $400 range. Compressor replacement is the most expensive outcome, generally ranging from $800 to $2,000 or more depending on the unit size and labor rates in your area.

Some causes can be addressed without special tools, such as clearing obstructions around the indoor and outdoor units and cleaning clogged air filters. However, checking refrigerant charge, inspecting service valves, and testing compressor wiring and winding resistance require gauges, a multimeter, and HVAC knowledge. If basic airflow checks do not resolve the fault, a licensed technician should perform the electrical and refrigerant diagnostics.

A power reset may temporarily clear the fault display, but if the underlying cause is not corrected, CH29 will return as soon as the compressor attempts to run again. Repeatedly resetting and restarting the unit without addressing the cause can accelerate wear on the compressor and inverter components. The fault needs to be properly diagnosed and repaired, not just cleared.