IC "A" School – Airflow, H2S, Refrigerant Practice Test

Red indicates danger on the control panel. In most safety and control systems, red is reserved for emergency or fault conditions, signaling an immediate action is required. When you see a red LED, prioritize following the safety procedure, check the fault or alarm details, and address the condition right away. Green usually means normal operation or ready status, orange or amber signals a warning that something isn’t right but isn’t an immediate stop, and blue is often used for information or service status.