12-time blink 2.5-second OFF — Indoor control system nonvolatile memory data read error

What does 12-time blink (2.5-second OFF) mean?

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

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

Click steps to track your progress.

1. 1

   Turn OFF the power supply to the unit.

2. 2

   Contact a qualified service technician. The manual suggests replacing the indoor electronic control P.C. board.

3. 3

   Do not attempt to replace the P.C. board yourself unless you are a qualified professional.