LG Air Conditioner Error Code UP

The UP code on an LG air conditioner means the unit has not completed its trial operation or commissioning process. It appears after a new installation, a control board replacement, or a power reset that clears commissioning memory. It is a status indicator, not a fault, and will clear once commissioning is finished. No component failure is implied by this code on its own.

The UP code does not indicate a safety hazard. It simply means the commissioning process has not been completed, and the system has not yet verified all installation parameters. The unit may still operate during this period, but commissioning should be completed promptly to confirm proper system function.

Because the UP code requires no parts replacement, the cost is typically limited to a service call fee for a technician to perform the commissioning procedure. Depending on your location and service provider, a standard commissioning or startup visit generally ranges from $75 to $200. If the code reappears due to a failed control board, board replacement costs would apply separately.

The UP code is resolved by completing the automatic commissioning sequence using the Tact Switch located on the unit's control board. A qualified technician presses the Tact Switch to initiate the inspection routine, and the UP display disappears once the process finishes. Alternatively, the code will clear on its own after the unit runs continuously for 1 hour in trial operation mode.

No, cycling power will not clear the UP code and may actually cause it to reappear if commissioning data is lost. The only reliable ways to clear UP are to run the automatic commissioning sequence via the Tact Switch or to allow the unit to complete 1 hour of trial operation.