Error 45 — Low pressure detected in system

What does [45] Low pressure detected in system mean?

This error means the system has detected low pressure. This can occur if the indoor and outdoor pipe temperatures are too low during cooling mode, or if the outdoor temperatures are too low during heating.

• Low pressure sensor reading is incorrect
• Not enough refrigerant in the system
• Leak in the system
• Blocked low pressure or liquid line piping
• Outdoor unit cannot start heating because the electronic expansion valve did not open
• Operating environment is outside the allowed range

Click steps to track your progress.

1. 1

   Check if the pressure switch wiring is connected correctly.

2. 2

   Use a multimeter to check if the high pressure switch is short-circuited.

3. 3

   Ensure the Electronic Expansion Valve (EEV) coil wiring is correct and firmly in place.

4. 4

   Open the service valve if it is closed.

5. 5

   Check if the piping system is clogged and clean it if necessary.

6. 6

   Replace the sensor if it is faulty.