LG Air Conditioner Error Code CH44

CH44 on an LG air conditioner indicates a fault with the outdoor air temperature thermistor. The control board has detected either an open circuit or a short circuit condition on the sensor that monitors outside ambient temperature. This prevents the system from receiving accurate temperature data, so it shuts down or restricts operation to avoid potential damage.

A power reset may temporarily clear the code, but if the underlying fault in the thermistor or its wiring still exists, the code will return as soon as the unit attempts to operate. A reset alone is not a fix and should only be used to confirm whether the fault is intermittent or persistent. Persistent CH44 codes require physical inspection and testing of the sensor and wiring.

If only the thermistor needs replacement, parts typically cost in the range of $15 to $60 depending on the model, with labor bringing the total to roughly $80 to $200. If the wiring harness is damaged, repair costs can be similar. A faulty outdoor control board is the most expensive scenario, with board replacement potentially ranging from $150 to $500 or more including labor. Getting a diagnostic visit from a technician will provide a more accurate estimate for your specific unit.

A knowledgeable DIYer can inspect the outdoor unit wiring and clean corroded connectors without specialized tools. However, accurately testing the thermistor requires a multimeter and knowledge of NTC resistance curves, and replacing components inside the outdoor electrical compartment can involve line-voltage wiring. If you are not comfortable working with electrical components, a licensed HVAC technician is the safer choice.

Operating the system with an active CH44 code is not recommended. The outdoor air temperature sensor is used to manage compressor protection and defrost cycles, and running without accurate ambient temperature data can lead to improper operation or component stress. It is best to leave the unit off until the fault is diagnosed and repaired.