I had a similar but not the exact problem where my clock worked when I plugged it in, under the pf to test, but when I installed it where it goes it showed clock error. After uninstalling it and readjusting the wires a bit if worked fine. It's a tight fit with all the wires along with plastic protectors and the piano mod installed too, so I think there was a pinched wire somewhere causing it. I'd look along those lines.