Left lamp lights up solid — Outdoor control system error, outdoor unit not operating

What does 9 (Left lamp solid) mean?

The left Operation Indicator lamp on the indoor unit remains continuously lit, and the outdoor unit does not operate. This indicates that the unit cannot properly read data in the nonvolatile memory of the outdoor unit's inverter P.C. board or outdoor electronic control P.C. board.

• Corruption or inability to read data from the inverter P.C. board's nonvolatile memory.
• Corruption or inability to read data from the outdoor electronic control P.C. board's nonvolatile memory.

Click steps to track your progress.

1. 1

   Turn off the main power supply to the unit and wait a few minutes before turning it back on.

2. 2

   If the lamp remains solid, refer to the outdoor unit service manual to check the blinking pattern of the LED on the inverter P.C. board or the outdoor electronic control P.C. board, which is a diagnostic step for technicians.

3. 3

   This error typically requires replacement of the inverter P.C. board or the outdoor electronic control P.C. board by a qualified service technician.