Outdoor Board LED1 (green) blinks three times and LED2 (red) blinks five times alternately - Abnormal low pressure (Low pressure switch 63L worked)

Was bedeutet U8, Ud ?

During startup or operation, the outdoor unit's LED1 (green) blinks three times and LED2 (red) blinks five times alternately, indicating abnormal low pressure due to the low-pressure switch (63L) activating.

• Abnormal low pressure; low pressure switch (63L) activated.
• Stop valves are not open.
• Refrigerant shortage or leak.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Check if the connector (63L) on the outdoor controller board is not disconnected.

2. 2

   Ensure all stop valves are fully open.

3. 3

   A qualified technician should inspect for refrigerant leaks and verify the refrigerant charge.

4. 4

   If the issue persists, measure resistance values of the linear expansion valve.