In message , Darren Griffin -
PocketGPSWorld writes
geoff wrote:
The fuse is telling you that you have a problem (looks like the fan).
Until you solve the problem, you'll keep on blowing fuses

The fuse is a 4A fast blow

look at my site www.cetltd.com

Thanks Geoff, is there an easy way of confirming that this is the cause? If
I can be ceratin it is then I can contact you regarding a recon replacement.

Only by disconnecting the fan (at the fan as the connector on the pcb
also has the air pressure switch connections)

If the fuse doesn't blow, it's probably the fan

The boiler won't go any further through it's sequence as the APS has to
change state for anything else to happen

--
geoff