Did you check the voltage at the fan pins on the PCB though? The wiring inside the sleeve is not dependable - there are little connectors in there and the wires can easily come loose that go to the fans. So check the voltage at the PCB first.
The easiest way to turn the fans on is probably to select PRINT, then select any print then immediately go to TUNE menu and then set fans to 100%. The printer will not start printing until you exit the TUNE menu. I think.
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gr5 2,224
There's a transistor (possibly a darlington) that can break easily in this circuit. If you are good at soldering surface mount you could replace it. Did it come with the original 12V fans that were mounted in series? Or do you need part numbers or something?
Schematic for UM2 circuit board is here:
ULTIMAKER 2 SCHEMATIC - click "raw":
https://github.com/Ultimaker/Ultimaker2/blob/master/1091_Main_board_v2.1.1_%28x1%29/Main%20Board%20V2.1.1.pdf
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