E556 (Red ON, Green Blink, Yellow OFF) — Capacity mismatch between indoor and outdoor units

What does E556 mean?

The outdoor unit's PCB LED displays E556 when the cooling or heating capacity of the installed indoor units does not match the outdoor unit's specifications. This can lead to inefficient operation or system faults.

• Incorrect indoor and outdoor unit model combination
• Wrong capacity settings configured for the outdoor unit
• Installation error

Click steps to track your progress.

1. 1

   Turn off the main power to the entire system at the circuit breaker.

2. 2

   Verify that all connected indoor units and the outdoor unit are compatible models and their combined capacities align with system requirements.

3. 3

   Consult your installation manual or a qualified technician to check and adjust the outdoor unit's capacity setup option settings if necessary.

4. 4

   Restore power and attempt to restart the system. If the error persists, professional assistance is needed.