[InGearsports]

I have a photosharp metal halide bulb exposure unit.
Over the last few days our shop took in some water from the weather.
When I turn on the exposure unit. The shutter wants to continuously shutter back and forth non-stop. No matter how many times I turn it on or off.
Now it didn't get water in the screen room but it was very damp in there.
I have a heater and de-humidifier in the room now.
Any ideas on what cud cause it to shutter like that?

Thanks in advance