Outdoor Board LED1 (green) blinks three times and LED2 (red) blinks four times alternately - Abnormal high pressure (High pressure switch 63H worked)

Was bedeutet U1, UL ?

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

• Abnormal high pressure; high pressure switch (63H) activated.
• Indoor/outdoor units have a short cycle on their air ducts.
• Heat exchanger and filter are dirty or clogged.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Check if indoor/outdoor units have a short cycle on their air ducts that could lead to high pressure.

2. 2

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

3. 3

   Check if the heat exchanger and filter are clean and not dirty.

4. 4

   Ensure the linear expansion valve is functioning correctly by measuring resistance values.