The problem is there is no air pressure to trip the pressure switch which is part of the start up proceedure. I checked it by hooking up the Twinmax! Certainly justified to her that little gadgets' purchase cost.
PCB is fine. The fan is turning, but without much effort, it is easily stopped with the lightest touch. Could it be that a winding has gone down, so the fan is not running fast enough to pressurise the flue?
And here's a bitch, non-Corgi purchasers of boiler parts get charged 25% extra and then vat; if given the custom in the first place! Bloody 'elf 'n safety.

Thanks all
and a very Happy New Year to you all!
