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Further to an earlier post my boiler was leaking so got that fixed turned out to be heat exchanger. Went turn it back on, totally dead! So it a new pcb and the user control switch and still nothing! Fuse is in pcb is ok. Checked wiring down to the switch at user controls, blue is live...

So my boiler was dispensing hot and cold dhw and had sprung a leak. Found the leak to be coming from the plate heat exchanger. Not long finished putting it all back together (had pcb out to find leak) and boiler won't turn on at all. Dead. Mains fuse is ok, so is one on pcb. Power going to the...