Diagnostic tips for stacking error LED 1 and LED 2 display solid green color, whereas, LED 3 displays solid orange LED 1 displays slow flash orange, LED 2 displays solid green, whereas, LED 3 displays different colors LED 1 displays slow flash orange and LED 2 displays solid green color, whereas, LED 3 displays different colors LED 1 and LED 2 display solid green, whereas, LED 3 displays different colors