LG Heat Pump Error Code 24

Error code 24 means the high pressure switch activated and shut off the compressor three or more times within one hour. The unit uses this safety lockout to prevent compressor damage from abnormally high refrigerant pressure. The most common reasons this occurs are restricted airflow, a blocked coil, or a fan that is not operating correctly.

No, it is not safe to force the unit to operate while this fault is active. The high pressure lockout exists specifically to prevent compressor damage that can result from sustained over-pressure conditions. Continuing to reset and restart the unit without resolving the root cause risks compressor failure, which is one of the most costly repairs on a heat pump system.

Repair costs vary widely depending on the cause. A coil cleaning or airflow correction service typically ranges from around $75 to $200. A fan motor replacement generally falls between $150 and $400 including labor. If the issue involves refrigerant overcharge or a failed filter drier, expect costs in the $200 to $600 range. Compressor replacement, if the unit sustained damage before the fault was caught, can cost $800 to $2,000 or more depending on the unit size.

Some causes of error code 24 are DIY-accessible, such as clearing debris from around the outdoor unit, straightening bent condenser fins, or confirming that both the indoor and outdoor fans are spinning freely. However, if the fans and airflow are normal, the problem likely involves refrigerant pressure or internal components that require a licensed HVAC technician with manifold gauges and refrigerant handling certification.

A power reset will clear the fault code and allow the unit to attempt restarting, but the error will return if the underlying cause is not corrected. Because the fault requires three high-pressure trips within one hour to trigger, a reset only resets the counter. If the same conditions are present, the compressor will trip again and error code 24 will reappear.