Upper lamp lights and lower lamp blinks — Operation mode conflict

What does Upper lamp lights and lower lamp blinks mean?

This indicates that the indoor unit's operation mode is set differently from other indoor units in a multi-system setup. The first unit set has priority. Other units may not operate.

• Indoor units are set to different operation modes (COOL/DRY and HEAT) simultaneously.

Click steps to track your progress.

1. 1

   Check the operation mode set for all indoor units in the system.

2. 2

   Ensure all units are set to the same operation mode (e.g., all COOL or all HEAT).

3. 3

   Refer to the outdoor unit service manual for specific instructions if the issue persists.