LG Air Conditioner Error Code 24

Error code 24 means the outdoor unit's high pressure switch has been activated and the system has shut down to protect itself from damage. The high pressure switch monitors refrigerant pressure on the discharge side of the compressor and opens the control circuit when pressure exceeds a safe limit. This is a protective fault, not a random glitch, and indicates a condition in the refrigerant circuit or outdoor unit airflow that needs to be addressed before the system is restarted.

No, the system has already shut itself off when this code appears, and you should not attempt to force it to restart repeatedly without identifying the cause. The high pressure switch exists specifically to prevent compressor damage and potential refrigerant line failures. Repeatedly resetting and restarting the unit without correcting the underlying problem can lead to compressor failure, which is a far more costly repair.

Repair costs vary widely depending on the cause. A condenser coil cleaning service typically runs in the range of $75 to $200. Replacing a condenser fan motor generally costs between $150 and $400 including labor. If the issue involves refrigerant overcharge or system contamination, expect costs in the range of $200 to $500 or more depending on the extent of work required. A high pressure switch replacement itself is usually a relatively inexpensive part, but labor and diagnostic time add to the total.

Some causes of error code 24 can be addressed without professional help, such as reconnecting a loose high pressure switch connector or cleaning a blocked outdoor condenser coil. However, any diagnosis or repair involving refrigerant pressures, refrigerant charge levels, or refrigerant recovery requires EPA Section 608 certification and proper equipment. If basic checks do not resolve the fault, a licensed HVAC technician should be called to perform gauge testing and further diagnosis.

A power reset may temporarily clear the fault and allow the system to restart, but if the root cause has not been corrected, the high pressure switch will trip again and the code will return. Clearing the code without fixing the problem risks compressor damage over time. The reset should only be performed after you have inspected the connector, confirmed the outdoor coil is clean, and verified that the condenser fan is operating correctly.