LG Air Conditioner Error Code CH33

CH33 indicates that the discharge pipe temperature on the constant speed compressor has exceeded a safe operating threshold. The discharge pipe carries hot refrigerant vapor out of the compressor, and when that temperature gets too high, the system shuts down to prevent compressor damage. Common causes include low refrigerant, a dirty condenser coil, or a failing condenser fan motor.

No, you should not continue operating the unit while CH33 is active. The system shuts down the compressor specifically to prevent heat-related damage, and bypassing or ignoring this fault can result in compressor failure, which is one of the most expensive repairs on an air conditioning system. Leave the unit off until the underlying cause has been diagnosed and corrected.

A power reset may temporarily clear the CH33 code and allow the unit to restart, but the fault will return if the underlying cause has not been resolved. Repeatedly resetting the unit without addressing the root issue risks permanent compressor damage. Always diagnose and correct the cause of excessive discharge pipe temperature before returning the system to normal operation.

Some basic checks are within reach of a knowledgeable DIYer, such as inspecting and cleaning the outdoor condenser coils and verifying that the condenser fan is spinning properly. However, if the cause involves refrigerant levels, contamination, or a faulty sensor, a licensed HVAC technician is required. Refrigerant handling requires EPA certification, so do not attempt to add or recover refrigerant without proper credentials.

Repair costs vary widely depending on the cause. A condenser coil cleaning typically runs between $75 and $200 for a service visit. Refrigerant recharge or leak repair can range from $150 to $600 or more depending on the refrigerant type and amount needed. A condenser fan motor replacement generally falls between $150 and $400 including parts and labor. Compressor replacement, if damage has already occurred, can exceed $1,000 to $2,500 or more.