If the track power status light on the LEFT side is completely OFF, you have no incoming power.
A fast flash means no control bus data signal from the command station on the right side of the box. Perhaps the 12" jumper cable is unplugged. or the right side of the box has no power.
A slow flash indicates a track power wiring short. Turn off the power. Remove the two wires connecting the booster to the track. Leave the wires disconnected. Restore power with the track disconnected. If the light is now solid, you just removed the problem. This means you have a short in your wiring, track, or locomotive.
A long then short flash is a temperature warning.
A series of short/long flashes that repeats every six seconds is a low voltage on the input from the transformer.
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