What does 12 mean?

The S4 high pressure switch has opened due to high system pressure. The corresponding compressor is de-energized for a set delay.

• High system pressure
• S4 high pressure switch malfunction

Click steps to track your progress.

1. 1

   Check for conditions causing high pressure, such as restricted airflow or overcharging.

2. 2

   Allow the system pressure to drop; the switch should reset automatically after a delay.

3. 3

   If the issue persists, check the S4 high pressure switch for proper operation.