Outdoor Board LED1 (green) blinks three times and LED2 (red) blinks three times alternately - Abnormality of superheat due to low discharge temperature

What does U7 mean?

During startup or operation, the outdoor unit's LED1 (green) blinks three times and LED2 (red) blinks three times alternately, indicating an abnormality of superheat due to a low discharge temperature.

• Abnormal superheat due to low discharge temperature.
• Stop valves are not open.
• Insufficient refrigerant charge.

Click steps to track your progress.

1. 1

   Check if the stop valves are fully open.

2. 2

   Check if the unit is filled with the specified amount of refrigerant.

3. 3

   A qualified technician should inspect the refrigerant charge and superheat settings.