Upper lamp lit — Outdoor unit control system error

What does 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 or the outdoor electronic control P.C. board.

• Corrupted data in outdoor control board memory
• Faulty inverter P.C. board
• Faulty outdoor electronic control P.C. board

Click steps to track your progress.

1. 1

   Check the blinking pattern of the LED on the inverter P.C. board or the outdoor electronic control P.C. board.

2. 2

   Refer to the outdoor unit service manual.

3. 3

   Replace the inverter P.C. board or the outdoor electronic control P.C. board if necessary.