FA-00 — OU: Abnormal high pressure, actuation of HPS

What does FA-00 mean?

The outdoor unit (OU) has detected abnormal high pressure, triggering the high-pressure switch (HPS).

• Refrigerant system overcharge
• Restriction in refrigerant lines
• Faulty high pressure sensor

Click steps to track your progress.

1. 1

   Verify the outdoor unit's air intake and exhaust vents are clear.

2. 2

   Check ambient temperature conditions.

3. 3

   A professional service technician is required for refrigerant system diagnosis.

4. 4

   Do not attempt to service the refrigerant yourself.