Nope, my Ultimaker 2 Go machines have different PCB revisions, 2.1.1 and 2.1.4.
With 2.1.1 electronics, the fan is always on.
Are the schematics available?
Well then that may be your problem. I'm not sure what version board came with the feature but you may be stuck with it always on.
If my memory isn't failing me, 2.1.1 is the "old" version without fan control. The new one has only been around for a very short while (since April(ish), I don't have a firm date or serial number range).
Doesn't look like schematics for the newest board is available yet:
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Labern 760
The UM2go's have a new circuit board that allows the fan to be controlled. eg on and off. As older printers didn't have this option it wasn't included in the firmware.
So FW 15.02 didn't have this option so the fan turns on as soon as the printer is switched on.
the feature was included in the new firmware 15.04go so that's why you see one turn on at 40deg.
the 3rd printer may have an issue. upgrade all printers to the new firmware and see if it resolves the issue of with the one not going. If it still doesn't work then check the wiring. You need this to work or you will end up having feeding issues and it will shorten the life of the PTFE coupler.
Make sure the solder joints on the fan are still connected, then make sure the plug is connected properly with no loose pins. If all ok the check the main board under the machine to see if it has a loose wire or broken solder joint.
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