Trackspot trouble when in DMX mode

Good evening,

I have a Trackspot that will run self-test with no problems.
The club owner states that this same fixture will act up when run on DMX.
Specifically, the problem is with the color wheel - the owner states that it is "off" - I imagine this to mean that it stops between colors.
I have confirmed that it is not due to programming it that way - other fixtures operate fine in the same slot.
The fixture was previously in the shop for a disconnected fan plug - unit would overheat.
It has a RED colored main board.

Any assistance would be appreciated.
John
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