Yikes! I was almost certain what had happened to me was a faulty board, but since it has happened to someone else, perhaps it should be more clear to the heated bed upgrade kit users that there is a way to damage their board!
So, when you are printing with the heated bed on, DO NOT use the power off button of your Ultimaker. Doing so might fry the output stage of the hot bed electronics, since the power switch will cut off power to the original control electronics and not to the add on board.
Why would you want to flick the power switch? Well in my case the feeder started losing grip, and I stopped the print. However, the temp was still high and Cura does not release the Z motor when you cancel a print, so I could not lower the bed by hand (with the old Z coupler, even with the stepper on I could turn the screw, but not with new one...).
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arnienz 0
Yes same problem today. Something has failed on the control board and the heated bed is full on permanently. Lucky I noticed it or there could have been a serious melt down!
I have sent a support request. Suggest you do the same.
Regards
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