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I actually was asking what part of the system was small bore. Keep the toys in the pram precious. I’m not being derogatory there are many people that have been supposedly trained and still know nothing. It’s a lot easier to help people if we get an idea of what they know and how they’ve learned. There’s lots of non plumbers out there still being paid to do plumbing jobs is all I was saying.
 
Quality, the valve isn’t the issue, first off you can only guess and question what previous issues there was and what plumber done, depending on size of system I have actually plugged cold feed from tank fitted ballofix to outlet and flexi pipe to cold mains feed allowing mains pressure to fill system, the reason for ballofix was to isolate, remove hose from mains and allow any overpressue to feed back into tank before removing ballofix and connection back to tank before removing plug,
First questions are, is there still power to pump, is the pump running on demand and have you checked when there is a demand the power is at pump
 
Quality, the valve isn’t the issue, first off you can only guess and question what previous issues there was and what plumber done, depending on size of system I have actually plugged cold feed from tank fitted ballofix to outlet and flexi pipe to cold mains feed allowing mains pressure to fill system, the reason for ballofix was to isolate, remove hose from mains and allow any overpressue to feed back into tank before removing ballofix and connection back to tank before removing plug,
First questions are, is there still power to pump, is the pump running on demand and have you checked when there is a demand the power is at pump
Agreed the valve isn’t the issue. But it shouldn’t be there from a safety perspective. Agreed check the pump is turning. If it is, is it weak? If it’s not turning is it getting power at the correct time?
 
Obviously I don’t agree with it being there but you have to question why is it there and original post states no heat past first valve does he mean pump valve, is that knackered/locked shut and when there is demand is the boiler actually firing up or is he just getting heat from the pump burning up, agree if you can’t advise or help don’t question logistics, some people are diy daft and will tackle anything and asking advise they expect a decent answer and see when they Damn it up that’s when I’ll earn my wages
 

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