Error 45 — System low pressure detected

What does 45 mean?

The system pressure is too low. This can be caused by low refrigerant charge, restrictions, or a low indoor load.

• Low refrigerant charge
• Blocked low pressure or liquid line piping
• System air leakage
• Low indoor coil temperature
• Outdoor unit cannot be turned on normally due to failure to open electronic expansion valve
• Operation environment is beyond the allowed range

Click steps to track your progress.

1. 1

   Check the refrigerant charge; ensure it's not too low.

2. 2

   Inspect the low pressure or liquid line piping for blockages.

3. 3

   Check for system air leaks.

4. 4

   Ensure the indoor coil is receiving adequate heat.

5. 5

   Verify the electronic expansion valve is functioning correctly.