LG Air Conditioner Error Code 41

Error code 41 indicates a fault with the outdoor unit inverter compressor discharge temperature sensor. The system has detected either an open circuit or a short circuit in the sensor circuit, which produces an invalid temperature reading. As a protective measure, the unit stops operating until the fault is resolved. The problem typically involves the sensor itself, its connector, or the wiring connecting it to the outdoor PCB.

The unit will typically shut itself down when error code 41 is active, which is a built-in protection to prevent compressor damage from unmonitored discharge temperatures. You should not attempt to bypass or override this shutdown. Continuing to operate the system without a functioning discharge temperature sensor risks serious and costly compressor damage.

A power reset may temporarily clear the error code and allow the unit to restart, but if the underlying fault with the sensor, wiring, or connector has not been corrected, the code will return quickly. Repeated resets without addressing the root cause will not fix the problem and may allow the compressor to operate without proper temperature protection. The fault should be diagnosed and repaired before returning the unit to normal service.

Checking and reseating the sensor connector at the outdoor PCB is a task many experienced DIYers can handle safely with the unit powered off. Measuring sensor resistance with a multimeter is also straightforward if you are comfortable with basic electrical testing. However, replacing the discharge temperature sensor or the PCB involves working inside the outdoor unit and may require handling refrigerant lines, so professional service is recommended if you are unsure about electrical work.

If the repair only requires cleaning or reseating a connector, the cost is minimal. Replacing the discharge temperature sensor itself is generally inexpensive, with parts typically ranging from around $15 to $60 and a service call adding labor costs on top. If the outdoor PCB has failed, expect total repair costs in the range of $200 to $600 or more depending on the model and local labor rates.