Code 84 — High Pressure Lockout (4 hrs)

What does 84 mean?

The system has locked out due to high pressure in the refrigerant system. This may indicate an issue with airflow or overcharging. Lockout lasts 4 hours.

• High refrigerant charge
• Blocked airflow (indoor or outdoor)
• Faulty high-pressure switch
• System operating in extreme heat

Click steps to track your progress.

1. 1

   Ensure indoor and outdoor unit coils are clean and airflow is unobstructed.

2. 2

   Allow the system the full 4-hour lockout period.

3. 3

   Check the system's operating temperatures.

4. 4

   Contact an HVAC technician to check refrigerant pressures and charge.