LG HVAC Error Code 63

Error code 63 on an LG HVAC system indicates that the condenser coil pipe sensor has detected an abnormally low temperature. In cooling mode, this is sensed at the outdoor unit; in heating mode, it is sensed at the indoor unit. The code is the inverse of error code 61 and typically points to a faulty thermistor, a bad connection, low refrigerant, or in some cases a failed PCB.

Continued operation with error code 63 is not recommended. A genuine low coil temperature condition can indicate low refrigerant, which can cause compressor damage over time if the system keeps running. The system may also short-cycle or operate inefficiently. It is best to shut the unit down and have it inspected before resuming normal use.

A power reset may temporarily clear the error code, but it will return if the underlying problem has not been resolved. If the thermistor is faulty, the connection is loose, or a refrigerant issue exists, the code will reappear once the system attempts to operate again. A reset should only be used as part of a structured diagnostic process, not as a stand-alone fix.

A knowledgeable DIYer can inspect and reseat the thermistor connector and verify resistance values with a multimeter, comparing them to the reference values of 10,000 ohms at 10 degrees Celsius and 2,800 ohms at 38 degrees Celsius. However, diagnosing low refrigerant charge requires EPA-certified equipment and a licensed technician. PCB replacement is also a straightforward swap but the part can be costly, so confirm the diagnosis thoroughly before purchasing.

Repair costs vary depending on the root cause. A thermistor replacement is typically the least expensive fix, with parts generally ranging from $15 to $60 and labor adding $75 to $200 depending on your region. A PCB replacement is considerably more expensive, with parts ranging from $150 to $500 or more. If a refrigerant recharge is needed, expect additional costs for refrigerant and the service call.