Error Code 42 — High pressure switch open

What does 42 mean?

The high pressure switch in the system has opened, indicating that the system pressure is too high. This protects the compressor from excessive pressure.

• Excessive refrigerant charge
• Dirty outdoor coil
• Restriction in the refrigeration circuit
• System operating at high pressure

Click steps to track your progress.

1. 1

   Check the continuity of the high pressure switch.

2. 2

   Inspect the outdoor coil for dirt and clean if necessary.

3. 3

   Check for restrictions in the refrigeration circuit.

4. 4

   If refrigerant pressures are correct but the switch is faulty, replace the switch.