Left/Upper lamp blinks 4 times with a 2.5-second pause — Indoor control system fault

What does Left/Upper lamp blinks 4-time blink, 2.5-second OFF mean?

The system cannot properly read data from the non-volatile memory of the indoor electronic control P.C. board. This indicates a problem with the indoor unit's main circuit board.

• Problem reading data from indoor P.C. board memory
• Faulty indoor electronic control P.C. board

Click steps to track your progress.

1. 1

   Power cycle the unit by turning off the power supply, waiting, and turning it back on.

2. 2

   If the error persists, replace the indoor electronic control P.C. board.

3. 3

   Ensure the unit is properly connected to power.