LG Air Conditioner Error Code 153

Error code 153 on an LG air conditioner means the system has shut down because the discharge temperature of constant speed compressor 2 in the sub3 outdoor unit rose to an unsafe level. This is a protective shutdown designed to prevent compressor damage. The unit will not resume normal operation until the underlying cause is identified and corrected. Diagnosis should follow the CH33 procedure outlined for this platform.

No, you should not attempt to bypass or ignore error 153. The system has already shut down compressor 2 automatically as a safety measure. Forcing the system to continue operating with this fault active could result in permanent compressor failure, which is one of the most expensive components in a multi-zone system. Leave the unit off until a qualified technician has diagnosed and resolved the issue.

Repair costs vary widely depending on the root cause. A coil cleaning or sensor replacement may cost between $100 and $300, while refrigerant recharge services typically range from $150 to $500 depending on the refrigerant type and quantity needed. If the compressor itself has been damaged, replacement costs can range from $800 to $2,500 or more for a multi-zone system. Getting a diagnostic inspection early helps avoid the higher end of that range.

Some basic checks, such as clearing debris from around the outdoor unit and cleaning dirty condenser coils, can be performed by a homeowner. However, most root causes of error 153, including low refrigerant, expansion valve issues, or compressor sensor faults, require a licensed HVAC technician with proper tools and refrigerant handling certification. Attempting refrigerant-related repairs without proper credentials is unsafe and illegal in most areas.

A power reset may temporarily clear the error and allow the system to restart, but the code will return if the underlying cause has not been addressed. Repeated cycling under high discharge temperature conditions increases the risk of compressor damage. A reset should only be used as a temporary measure while arranging for a professional inspection, not as a solution.