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Thanks for the reply the PCB was not changed as far as i am aware, it took the guy about 5 hours to change the diaphram as the first time it leaked and the second time he left an o ring out, had to feel sorry for him the boiler is in quite a small area and to say he lost a few pounds in sweat...

Hi I have just had the diaphram changed on my boiler. I have noticed over the last week or two that the central heating temperature does not change wherever you put the dial whether it be on 1 or 4, pretty much the same with the water, moving it from 4 to 1 makes no difference to the...