Langly

Thanks very much everyone for your help. After double checking the wiring thanks to the diagrams I fitted a new fan and it's all working beautifully now. I'm assuming that the polarity IS crucial, not just from the point of view of which way it's blowing air, but also the fan seems to prefer it that way and will leak black smoke if you get it wrong. Thanks All 🙂

Hey, thank you very much! Sorry for the delay in getting back to you. I'll have a look at these. Very much appreciated.

Hey Mari, thank you very much for this. I learned some handy stuff from the manual, especially the bit about aligning the bearings, but sadly it doesn't mention the polarity of the fan DC supply, although it does point out which way the rear fan should be facing, which suggests that the direction it spins in is important. Thank you.

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.