What does 45 mean?

The system pressure is too low. This can be caused by a lack of refrigerant or issues with heat transfer in the coils.

• Lack of refrigerant charge
• Low heat on the indoor coil
• Restrictions, airflow problems, or dirt
• Low indoor load
• Cold outdoor air (in heating mode)

Click steps to track your progress.

1. 1

   Check the refrigerant charge level.

2. 2

   Ensure adequate heat is available for the indoor coil.

3. 3

   Clean air filters and coils; check for airflow obstructions.

4. 4

   Verify the indoor load is appropriate for the system's capacity.