Error 407 — Compressor operation stop due to high pressure protection control

What does 407 mean?

The compressor has stopped operating because the system detected excessively high refrigerant pressure. This is a safety shutdown to protect the compressor and system from damage.

• Overcharge of refrigerant in the system
• Blocked or dirty condenser coil restricting heat rejection
• Faulty outdoor fan causing insufficient airflow
• Restricted liquid line or closed service valve

Click steps to track your progress.

1. 1

   Turn off the outdoor unit and allow it to cool down.

2. 2

   Clean the outdoor unit's condenser coil to ensure proper airflow and heat dissipation.

3. 3

   Check if the outdoor fan is spinning freely and not obstructed, and that it is running when the unit tries to operate.

4. 4

   Verify that all service valves are fully open if they were previously closed for maintenance.

5. 5

   This often indicates a refrigerant charge issue or a blocked component, requiring a qualified HVAC technician to diagnose and rectify.