Low Pressure Lockout for 4 Hours 83

What does 83 mean?

The system is locked out for 4 hours due to persistent low pressure events. This can be caused by cooling in low ambient conditions, an undercharged system, insufficient indoor airflow, or closed service valves.

• Cooling in Low Ambient region (55°F and below) with 'Low Ambient Cooling' disabled
• Undercharged System
• Indoor Airflow too low or off
• Service Valve left closed (Liquid or Vapor)
• Expansion Orifice Restriction
• Restriction due to debris

Click steps to track your progress.

1. 1

   If cooling in low ambient conditions, enable 'Low Ambient Cooling' via the user interface.

2. 2

   Check system subcooling to determine the refrigerant charge status; if low, add charge.

3. 3

   Inspect the indoor unit for clogging (ice or debris) and clean if necessary; ensure the indoor fan motor is working.

4. 4

   Confirm that all service valves (liquid and vapor) are fully open.

5. 5

   Troubleshoot the TXV for expansion orifice restriction or clean the system and replace the filter drier if debris is suspected.