Firstly thanks for all the advice, and apologies for not getting back sooner (didn't want to start a riot though!)
One further piece of 'evidence' I should have supplied is that although I am convinced that the diverter is the problem, the fault is intermittent. I reckon the thing fails to...
Thanks David, I'm assuming the DV.140 is the one to go for? (the only one they are showing online)
If so, seems like it's worth a go if 1) it might work and 2) it saves me from having to do battle with the dreaded back nut that others have referred to!
Steve
Thanks folks - £150 seems like a lot of money - but then what do I know!
Is it worth shopping around for these sort of things or are prices the same all over?
Steve
Hi all
Although this is my first post, with the benefit of previous threads and similar symptoms, I believe I have correctly diagnosed my intermittent CH problems to be the diverter valve in my Potterton Puma 100.
(thanks to all those who have unknowingly helped me get this far- oh and...