LG Heat Pump Error Code 49

Error code 49 on an LG heat pump indicates that the voltage sensor circuit has been detected as either open or shorted. The PCB monitors the signal from this sensor continuously, and when the signal falls outside acceptable parameters, the unit logs this fault. The error points to a wiring connection issue or a failed sensor component that needs inspection and testing.

Continuing to operate the unit with an unresolved voltage sensor fault is not recommended. The voltage sensor provides critical data to the control board, and without accurate readings, the system may be unable to protect itself from abnormal electrical conditions. It is best to power down the unit and have it inspected promptly.

Repair costs depend on the specific cause. If the fix is a reseated wiring connector, a service call fee of roughly 75 to 150 dollars may be the only expense. If the voltage sensor needs replacement, parts and labor typically range from 150 to 350 dollars. A PCB replacement, if required, can push total costs to 400 to 800 dollars or more depending on the model and labor rates in your area.

Some causes of error code 49 can be addressed without specialized tools. Checking that the sensor wiring connector is fully seated at the PCB is a reasonable first step for a knowledgeable DIYer. However, measuring sensor resistance or voltage and replacing a faulty sensor or PCB involves working with live electrical components and is best handled by a qualified technician.

A power reset may temporarily clear the error display, but the code will return if the underlying fault in the sensor circuit has not been corrected. Resetting without repairing the open or short circuit does not resolve the problem and may allow the fault condition to persist unnoticed.