Studio color not receiving DMX?

Got one of my studio colors that powers up runs through its start up, then moves to home and just sits there. The DMX receive light fails to come on even though DMX is present as the lights after it run fine.

I have tried changing the DMX chip but that didn't have any effect and I have stable 5v onto the board.

On the screen I get R13.0 flash up which I haven't seen before but can't find it as an error in the manual?

Running the light is test mode it all works fine, any ideas?
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