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Fixed :D Managed to find an ex-Vaillant chap who diagnosed the problem quickly. Looks like it was the diverter in the end - just the diaphragm. Thanks for the input guys - I took on board the thing about installers not necessarily meaning expertise at fixing. That knowledge of the older...

the trick with the power switch initially worked a few times when the engineer tried it but then stopped working. when he did it I was surprised as I had tried the same thing and no joy :?

Hi Tony, so no firing up of the boiler at any point with CH on and none of the hot water taps switched on. shame anything else I can try out? Would it help to get a manufacturers manual and trying to understand what parts I am looking at when I examine? I'm having a hard time finding an...

I shall check - I'm assuming you mean I should have the CH switched on during this time! Any other diagnostics I can supply? The only other possibly relevant information I can think of is that I've had to repeatedly bleed some of my radiators a few times over the winter. I may have done...

thank you both. Ollski, I have no idea what you're talking about but that's because I don't know much about boilers! What I can say is that I've never seen the boiler fire up without demand - currently it only fires up for HW and never fires up for CH, regardless of whether HW has been...

Hi, my Vaillant VCW242E has not been firing up it's CH. HW works fine, but CH never triggers the ignition. All the other sounds seem normal like the pump, just doesn't do the 'click' and ignition. I've had a guy come round and he checked the divertor valve but he doesn't think that's at...