Left lamp blinks 4-time 2.5-second OFF — Indoor control system nonvolatile memory data read error

What does Left lamp blinks 4-time 2.5-second OFF mean?

The left lamp of the OPERATION INDICATOR blinks four times, followed by a 2.5-second pause. This signifies that the indoor electronic control P.C. board cannot properly read data in its nonvolatile memory.

• Failure of the indoor electronic control P.C. board.
• Corrupted data within the nonvolatile memory of the P.C. board.

Click steps to track your progress.

1. 1

   Turn OFF the power supply to the unit.

2. 2

   Contact a qualified service technician for diagnosis.

3. 3

   The manual recommends replacing the indoor electronic control P.C. board.