Samsung Air Conditioner Error Code UP

The UP error code on a Samsung air conditioner indicates that the trial operation, also called commissioning, has not been completed. This is not a fault in the traditional sense but rather a status indicator that appears when a new installation or system reset has occurred without the unit running through its required commissioning sequence. The code remains active until either the commissioning mode runs continuously for one hour or the automatic inspection routine finishes successfully.

Commissioning is a required initialization procedure that allows the system to verify refrigerant charge levels, check communication between the indoor and outdoor units, confirm proper airflow, and establish baseline operating parameters. Without completing this process, the unit may not operate in its full capacity or may behave unpredictably. The tact switch, a small tactile push-button located on the control board, is the designated trigger for initiating the automatic commissioning sequence.

The most common reason the UP code appears is simply that the commissioning procedure was never run after installation. This can happen when a technician powers up the system but skips the commissioning step, or when a power interruption interrupts a commissioning run in progress. On multi-split and commercial Samsung systems, the UP code may persist across all indoor units if even one zone has not been properly commissioned. Resolving the code is straightforward once the correct commissioning procedure is followed using the tact switch on the control board.