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Not sure if it has developed recently, I suspect it has always been like this, and we have not noticed due to the on times of the CH + HW not coinciding. There is no effect of turning the 2nd pump on/off. BR Viren

We have recently (12 mons ago) put in a new Keston boiler. The plummer could not figure it out either, but is convinced it has nothing to do with the boiler, as the boiler is installed in the basement and the MVs and pipe work concerned is in the loft! I am sure prior to that the system was fine...

It is a sealed system (no leaks!) pressure is at a steady 1.5 bars. ps Just checked it again with CH on the system is fine, and as I open the MV manually for the HW, both the pipes for the CH and HW go to luke warm/cool, and the flow pipe is still v hot! It is as if there is flow the...

Hi, I am new to this forum, so forgive me if I havent followed the rules of the forum. I have a heating system that seems to get confused (it could be me that is confused!) when both the HW and the CH are on, so much so that neither work. The boiler and everything else seems to be working...