E554 (Red ON, Green Blink, Yellow OFF) — Refrigerant gas leak error

What does E554 mean?

The outdoor unit's PCB LED displays E554 when the system detects a refrigerant gas leak. This indicates a potential loss of refrigerant, which can severely impact performance and damage the unit.

• Refrigerant leak in the system piping or components
• Incorrect indoor and outdoor unit model combination (capacity mismatch)
• Faulty refrigerant sensor

Click steps to track your progress.

1. 1

   Turn off the unit immediately at the main circuit breaker to prevent further operation with insufficient refrigerant.

2. 2

   Visually check for any obvious signs of refrigerant leakage, such as oil stains on pipes or connections.

3. 3

   Verify that the indoor and outdoor unit models are compatible and correctly matched according to your system's specifications.

4. 4

   A gas leak requires a qualified HVAC technician to locate, repair, and properly recharge the system with refrigerant.