Left/Upper lamp blinks 4 times — Indoor unit control system fault

What does Left/Upper lamp 4-time blink mean?

This indicates a fault within the indoor unit's control system, likely related to its electronic control P.C. board. The unit may not operate normally.

• Indoor unit control system malfunction
• Faulty indoor electronic control P.C. board

Click steps to track your progress.

1. 1

   Replace the indoor electronic control P.C. board.

2. 2

   Ensure the power supply to the indoor unit is stable.

3. 3

   Check for any loose internal connections on the control board.