Dimmers won't Dim

Hello.

I am a TD/Everything guy at a middle school. We have an Express 24/48 with an Unison Dimmer Rack. The dimmer rack is currently showing an error with an orange light blinking. The lights are working but I do not have dimming control. They are either at 0 or 100, no matter where the dimmer slider is postioned.

 Can anyone give me a clue. We do not have the budget for a tech to come out.

 

Thanks

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