LG Heat Pump Error Code CH22

CH22 indicates that the current transformer monitoring the compressor circuit detected an overcurrent condition, meaning the compressor was drawing more electrical current than the maximum safe limit. The system shuts down automatically to protect the compressor and related electrical components from damage. The fault can originate from wiring issues, supply voltage problems, refrigerant charge problems, or mechanical blockages in the outdoor unit.

No. The unit has already shut down as a protective measure, and attempting to force it to run while the underlying cause is unresolved risks permanent compressor failure or an electrical hazard. Leave the system off and have it inspected before resuming operation.

Repair cost varies widely depending on the cause. A simple wiring correction or condenser cleaning may cost between $75 and $200 for a service call. Refrigerant recovery and recharge can add $150 to $400 or more depending on the refrigerant type and quantity involved. Compressor replacement, which is required if internal winding damage is confirmed, typically ranges from $800 to $2,500 or higher depending on the unit size and labor rates in your area.

Some preliminary checks, such as inspecting the outdoor unit for debris blocking the condenser coil or fan, can be done safely by a homeowner. However, diagnosing wiring faults, measuring compressor insulation resistance, and evaluating refrigerant charge require specialized tools and training. Because the fault involves high-voltage compressor circuits, most of the repair work should be performed by a licensed HVAC technician.

A power reset may temporarily clear the fault code, but the error will return quickly if the root cause has not been addressed. Repeatedly resetting the unit without fixing the underlying problem can accelerate damage to the compressor. A reset should only be performed after the cause of the overcurrent condition has been identified and corrected.