I'm fitting a UM fan kit (ULT1004000327-P1) to an Ultimaker 2. The new 2x 12V side fans are working fine, but when I plugged the rear 5V fan in, at first it wouldn't work, then spun normally for a while, then finally when I tested it before reassembly it started to smoke and now doesn't work.
When I check the polarity of the feed from the FAN 5V J34 connector on the PCB it's reversed compared to the red/black colouring of the cable in the wiring loom. I've attached a photo of the plug on the PCB end of the wiring loom (top) compared to the plug on the fan (bottom).
The old fan obviously worked fine, and has the same serial number as the new one, so I need to know if the wiring is correct, or has the loom been made up wrongly when assembled originally. Also whether the new fan I fitted doesn't like the polarity being reversed or was just faulty.