LG HVAC Error Code 24

Error code 24 on an LG HVAC system means the high or low pressure switch has opened and cut off compressor operation. The low pressure switch opens at 14 PSI and the high pressure switch opens at 600 PSI. The system shuts down automatically to prevent compressor damage when pressures fall outside these limits. A technician should check refrigerant pressures, wiring, and airflow to identify the root cause.

No. Error code 24 indicates the system has already shut down as a safety measure because refrigerant pressure reached an unsafe level. Attempting to override or repeatedly restart the system without addressing the underlying cause can damage the compressor. The system should remain off until the fault is properly diagnosed and corrected.

Repair costs depend heavily on what caused the pressure fault. A simple wiring correction or coil cleaning may cost between $75 and $200 for a service call. Refrigerant leak detection, repair, and recharge can range from $200 to $600 or more depending on the size of the system and severity of the leak. Replacing a failed component such as an expansion valve or condenser fan motor typically adds $150 to $400 in parts and labor on top of diagnostic fees.

Some causes of error code 24 can be addressed without professional help, such as cleaning a blocked outdoor condenser coil or verifying that indoor unit wiring is correctly connected on Flex Multi systems. However, diagnosing refrigerant pressure issues, locating leaks, and recharging the system require EPA certification and professional equipment. If basic checks do not resolve the fault, a licensed HVAC technician should handle the repair.

A reset may temporarily clear the fault and allow the system to restart, but it will not fix the underlying pressure problem. If the cause is not corrected, the pressure switch will open again and the error code will return. A reset is only useful for confirming the fault is active, not for resolving it permanently.