Sky Air concealed ceiling split systems code list
Family-scoped air-conditioner codes with the shortest useful meaning line for quick triage.
A0
The system has detected a refrigerant leak.
Shown on the user interface during test run or troubleshooting.
E3/E4/L8
The unit is protecting because stop valves are closed or airflow is blocked.
Shown on the user interface during test run when the outdoor unit installation is not correct.
U0
The system sees closed stop valves.
Shown on the user interface during test run or fault diagnosis.
U2
The power supply is out of range or has a phase problem.
Shown on the user interface during test run or startup when power supply conditions are abnormal.
U4/UF
The indoor and outdoor sections are not wired together correctly.
Shown on the user interface during test run when the system detects an inter-unit communication or branch wiring problem.
UA
The indoor and outdoor units are incompatible.
Shown on the user interface during test run or commissioning when unit pairing is invalid.