Icos HE 15 wont power up?

There is a 3.15amp fuse on the pcb, possibly that is the one blown, usually taken out by the fan.
Without going into much detail about resistances in the fan, you need someone competent with the boiler to test before replacing anything.
If you go headlong into an expensive pcb without testing, it too could be blown without warning unless everything is tested correctly.

Carefree
December 2010