LG Air Conditioner Error Code 49

Error code 49 on an LG air conditioner means the outdoor unit has detected a voltage sensing error. The PCB's voltage sensing circuit is reading a value that is not within the normal range, either due to an open or short circuit condition in the sensor path. The unit shuts down to protect its components until the underlying cause is corrected.

A power reset may temporarily clear the error code, but if the underlying cause is still present, the fault will return shortly after the unit restarts. The voltage sensing circuit will continue to detect the abnormal condition and re-trigger the error. Resolving the root cause, whether a voltage supply issue, a blown fuse, or a failed PCB, is necessary for a permanent fix.

Repair costs depend on the cause. Replacing a blown outdoor line fuse is a relatively low-cost fix, typically ranging from $50 to $150 including labor. If the outdoor PCB requires replacement, costs can range from $300 to $700 or more depending on the unit model and labor rates in your area. Having a technician diagnose the root cause first is the best way to get an accurate estimate.

Some steps are within reach for a knowledgeable DIYer. You can verify that the circuit breaker supplying the outdoor unit is fully engaged and check for a blown outdoor line fuse, replacing it if needed. However, measuring supply voltage at the outdoor unit terminals and diagnosing a failed PCB require working around live electrical components, which should only be done by a qualified technician.

No. Error code 49 indicates the outdoor unit is not receiving or detecting proper voltage, and the unit will typically shut down automatically as a protective measure. Attempting to bypass or ignore this fault could expose electrical components to damaging voltage conditions. The system should remain off until the voltage issue is diagnosed and corrected.