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Discuss Heating not circulating in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Dan Gilbrook

    Dan Gilbrook New Member

    Hi,

    A new customer has contacted me stating a plumber fitted a new radiator for them recently and a few isolation valves and now their heating isn't working.

    I went out to view and couldn't see anything obvious other than the pump not circulating past its top valve. The only other thing is the old guy put an iso valve on the cold feed coming off the f and e tank, to Isolate it easier. There's a separate vent on it so as I understand there's no risk of pressure build up (correct me if I'm wrong) but has anyone heard of this causing issues with the heating? (air expansion etc.) Never come across it before and I would fit valves on the Inlet side of the tank so haven't had to deal with issues on the cold feed side. I told them I'd get back to them ASAP, but as far as I can see, the pumps had it. Any advice?
     
  2. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Should never be an iso on the feed pipe. It’s there for expansion too. It could be that when the work was done the othe bloke hasn’t filled it up and bled it properly and the pump was running dry and is now goosed
     
  3. Dan Gilbrook

    Dan Gilbrook New Member

    Ok, is that still definitely the case when it's not a combined coldfeed expansion? I thought if they were separate the expansion wouldnt go back through the feed due to weight in the pipe and so on?

    Seems like I was correct with the pump fault but I don't want anymore issues arising due to this valve. Thanks for replying.
     
  4. Rob876

    Rob876 Member

    Could the iso valve be restricting flow through the system? If its a small bore iso valve.
     
  5. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    No it’s on the feed pipe mate. The feed pipe is also for expansion. It’s not just about the vent pipe
     
    • Like Like x 1
  6. Rob876

    Rob876 Member

    Did he open this iso valve in the first place? o_O
     
  7. Dan Gilbrook

    Dan Gilbrook New Member

    It's definitely a small bore, and I did wonder that but the pump isn't pushing anything away to upstairs so I don't think that's the issue, I pulled through some of the water from the drain off out my hose and everything heated up then, so I reckon it's not heating due to the pump, but like I said if a new pump is installed I don't want issues occurring due to this iso valve. Just wondered if it's worth taking it off or not.
     
  8. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    It will always need to be open. Scratch that. It needs to be removed
     
    • Like Like x 1
    • Agree Agree x 1
  9. Dan Gilbrook

    Dan Gilbrook New Member

    Haha yeah it was open when I got there and everything was full.
     
  10. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    What’s small bore??
     
    • Like Like x 1
  11. Dan Gilbrook

    Dan Gilbrook New Member

    It's a small iso valve 10mm bore I believe. Large bore are 15mm or same as the pipework.
     
    • Like Like x 1
  12. Rob876

    Rob876 Member

    Lol if there was to be an iso valve it should be full bore, but there shouldn't be one there anyway!
     
  13. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    The feed will not be 10mm
     
  14. Rob876

    Rob876 Member

    I think he means the bore inside the valve? If they aren't full bore then they are, um, not full bore :eek:
     
  15. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Small bore is misleading. Anyway it shouldn’t be there please remove
     
    • Like Like x 2
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