Refrigeration Circuit 2 High Pressure Lockout

What does C2 Locked Out Due to High Pressure mean?

This alarm occurs when 24 VAC power is lost from the HPS2 terminal, indicating a high-pressure condition in refrigeration circuit 2. Multiple occurrences within an hour will cause a hard lockout.

• High pressure switch activated
• Dirty or blocked condenser coil
• Condenser fan or low ambient control not working
• Improper SEC board configuration
• System overcharged
• Blocked liquid line filter
• Faulty TXV (Thermostatic Expansion Valve)
• Loose wire connection on the high pressure switch

Click steps to track your progress.

1. 1

   Connect pressure gauges and check suction and discharge pressures for refrigeration circuit 2.

2. 2

   Clean or clear any blockages in the condenser coil.

3. 3

   Verify the condenser fan and low ambient control are functioning correctly.

4. 4

   If a split system, check that solenoid valves are energized and opening.

5. 5

   Ensure the SEC board is properly configured.

6. 6

   Check system charge, liquid line filter, and TXV operation.