LG Air Conditioner Error Code CH63

CH63 on an LG air conditioner indicates that the condenser pipe temperature has been detected as too low by the system. The condenser pipe thermistor monitors the outdoor coil temperature, and when that reading falls below the acceptable range, the unit faults out with CH63. Common causes include low refrigerant, a defective thermistor, or restricted outdoor airflow.

No. The system typically shuts itself down when CH63 is triggered specifically to prevent further damage. Attempting to bypass or continuously restart the unit without addressing the underlying cause can lead to compressor damage or other costly failures. The unit should remain off until the fault is properly diagnosed and repaired.

A power reset may temporarily clear the CH63 code and allow the unit to restart, but if the underlying fault persists, the error will return. Resetting without addressing the actual cause does not fix the problem and can mask a worsening condition. A proper diagnostic inspection is needed to permanently resolve the fault.

Some basic checks, like clearing debris from around the outdoor unit and inspecting the fan for operation, can be done by a homeowner. However, diagnosing a faulty thermistor or checking refrigerant charge requires specialized tools and, in the case of refrigerant work, EPA certification. It is recommended to contact a licensed HVAC technician for a complete diagnosis.

Repair costs vary depending on the root cause. A thermistor sensor replacement is generally a lower-cost repair, typically in the range of $75 to $200 including labor. Refrigerant recharge or leak repair can range from $150 to $500 or more depending on the amount of refrigerant needed and whether a leak must be located and sealed. Control board replacement tends to be the most expensive option.