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Hi Dan, Thanks for the reply. Yes, lots of info there, but probably not detailed enough to isolate. I have removed the actuator/valve changing device that switches the route to hot water and heating, i held my hand over the rad pipes to check hot water was coming through. So I think...

Hi, I have a Potterton boiler that happily fires up, heats for about 2 minutes and then switches itself off. When I put the programmer on 'Hot Water', the pump gets very hot - the pipes in and out of it are hot too, so the heated water appears to be in the tank, and presumably pumping...