Code 31-11 (Limiting) or 31-58 (Lockout) - Compressor high pressure detected.

What does 31-11 / 31-58 mean?

The system detects excessively high discharge pressure, leading to either compressor speed reduction (31-11) or a system shutdown and 2-hour lockout (31-58 if at minimum speed). The system attempts to self-correct by reducing compressor speed over time.

• Dirty or obstructed outdoor condenser coil.
• Insufficient airflow across the condenser.
• Recirculation of hot air around the outdoor unit.
• Extreme high ambient temperatures or direct sun exposure.
• Blockage in the refrigerant circuit or faulty EXV/TXV.
• Overcharge of refrigerant in the system.

Click steps to track your progress.

1. 1

   Inspect and clean the outdoor condenser coil if it appears dirty or clogged with debris.

2. 2

   Ensure there are no obstructions (plants, fences, stored items) blocking airflow around the outdoor unit.

3. 3

   Verify that the unit is not exposed to extreme direct sunlight or excessive heat that could be causing high pressures.

4. 4

   For persistent faults or suspected internal issues like refrigerant problems, contact a qualified HVAC technician for diagnosis and repair.