UL - Abnormal low pressure

What does UL mean?

The system has detected abnormally low pressure in the refrigerant circuit. This usually points to a lack of refrigerant or a blockage.

• Refrigerant leak.
• Insufficient refrigerant charge.
• Blockage in the refrigerant lines.
• Faulty low-pressure sensor.

Click steps to track your progress.

1. 1

   Turn off the air conditioning unit.

2. 2

   Check around the indoor and outdoor units for any signs of refrigerant leaks (e.g., oily residue).

3. 3

   Allow the unit to rest for an hour before restarting.

4. 4

   If the error persists, contact a certified HVAC technician to check refrigerant levels and inspect for leaks.