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Hi, I've had an engineer try a new fan today (as they had the part available) but this made no difference - fuse still blew about 2-3 seconds into ignition sequence as electrode was sparking. Looks like I'll have to call it a day. Thanks for the help.

Thanks DP, the fuse in the Pcb is a 3.15at - still intact. I believe the original Pcb was indeed dead. There was a smell of burning from the casing. The old unit was black the new one is orange, which I believe is meant to be more robust. When I tested the oh stat, resistance was infinity at...

Hi Tony, I have tried to get somebody to look at the boiler but they suggested replacing it (after suggesting to replace the Pcb) given the model and age of the boiler. DP, thanks for the suggestion. I will try removing the pump, however I'm not convinced this is the issue as it happily runs...

Hi, I've just replaced the pcb on our old icos he18 boiler and now its blowing the 2amp quick blow fuse in wiring centre (not the fuse in the Pcb). We tested fan resistance before changing and harness for earth leak/cross continuity. The PCB was replaced because the boiler was completely dead...