What does PL mean?

The busbar voltage is lower than the set value for low voltage protection while the compressor is running. This causes the system to shut down. The ODU main board LED will show this error.

• Voltage of power grid is abnormal
• Drive board busbar voltage sampling circuit element is damaged
• Drive board busbar voltage sampling AD terminal is abnormal

Click steps to track your progress.

1. 1

   Check if the power grid voltage is normal.

2. 2

   Replace the drive board if its busbar voltage sampling circuit or AD terminal is damaged.