Error Code 43 — Low pressure switch open

What does 43 mean?

The low pressure switch in the system has opened, indicating that the system pressure is too low. This can lead to insufficient cooling or heating.

• Lack of refrigerant charge
• Low heat load on the indoor coil
• Restrictions or airflow issues
• Low indoor load

Click steps to track your progress.

1. 1

   Check the continuity of the low pressure switch.

2. 2

   Verify the refrigerant charge level.

3. 3

   Ensure there is adequate airflow to the indoor coil.

4. 4

   Check for restrictions in the system.

5. 5

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