Left/Upper lamp lights up — Outdoor unit does not operate, potential memory issue

What does Left/Upper lamp lights up mean?

The outdoor unit does not operate because the system cannot properly read data from the non-volatile memory of the inverter P.C. board.

• Cannot read data from outdoor inverter P.C. board memory
• Faulty outdoor inverter P.C. board

Click steps to track your progress.

1. 1

   Check the blinking pattern of the LED on the inverter P.C. board for more information.

2. 2

   The outdoor unit's service manual may provide further diagnostic steps.

3. 3

   Replacement of the inverter P.C. board might be required.