LG HVAC Error Code 22

Error code 22 on an LG HVAC system indicates an inverter unit high amperage fault. The system has detected that the compressor is drawing more current than the inverter drive allows and has shut down to protect the components. The fault can stem from low supply voltage, high head pressure, or a failing compressor. A technician should diagnose the root cause before restarting the system.

No. Error code 22 causes the unit to shut down specifically because continuing to operate under high amperage can damage the compressor windings, inverter board, and associated power electronics. Attempting to override or repeatedly reset the unit without fixing the underlying problem risks turning a repairable fault into a full compressor replacement.

Repair cost depends heavily on the root cause. Cleaning a condenser or correcting a wiring issue is relatively inexpensive, typically in the range of $75 to $250 for a service call. Compressor replacement is the most expensive outcome, often ranging from $800 to $2,000 or more depending on unit capacity and labor rates. Inverter board replacement typically falls somewhere in between, commonly in the $400 to $900 range including parts and labor.

Some contributing factors, such as cleaning a blocked condenser coil or confirming the breaker and wiring are delivering proper 208/240V, are within reach of a knowledgeable DIYer. However, testing compressor windings, checking refrigerant pressures, and evaluating the inverter board all require specialized tools and training. Most repairs that address the root cause of code 22 should be handled by a licensed HVAC technician.

A power reset may temporarily clear the fault and allow the unit to restart, but if the underlying cause is not corrected the code will return, often quickly. Repeated resets under a high-amperage condition can accelerate damage to the compressor and inverter components. The fault should be diagnosed and repaired rather than cleared by reset alone.