LG Heat Pump Error Code CH29

CH29 indicates that the inverter compressor input current has exceeded 30 amperes across its phases, triggering a protective shutdown. The system monitors current on all compressor phases and shuts down when it detects this overcurrent condition. The fault can originate from refrigerant system problems, a failing compressor, voltage issues, or faulty wiring connections. A complete diagnosis should cover all of these areas before any parts are replaced.

No, you should not attempt to keep the system running with CH29 active. The fault represents a real overcurrent condition that can damage the compressor, inverter drive board, or wiring if the system is forced to restart repeatedly. Leave the unit off until the root cause has been identified and corrected.

Repair costs vary widely depending on the root cause. A simple fix such as clearing a refrigerant restriction or tightening connections may cost between $100 and $250 for a service call. Refrigerant adjustment or an EEV replacement typically runs between $200 and $600. If the compressor itself has failed, replacement costs including labor can range from $800 to $2,000 or more depending on the unit size and local labor rates.

Some basic checks are within reach of a knowledgeable DIYer, such as verifying that nothing is blocking or covering the outdoor unit and confirming that supply voltage at the disconnect is near 220V. However, measuring compressor winding resistance and insulation values, checking refrigerant charge, and testing the EEV require specialized tools and, in most areas, EPA certification to handle refrigerant. It is best to have a licensed HVAC technician complete the full diagnosis.

A power reset may temporarily clear the fault display, but the error will return as soon as the underlying condition causes current to exceed 30 amperes again. Resetting without addressing the root cause risks further damage to the compressor or inverter components. The fault should be fully diagnosed and repaired before the system is returned to normal operation.