1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Valliant Pump Overrun s.07

Discussion in 'Plumbing and Central Heating' started by Raje, 24 Sep 2019.

  1. Raje

    Raje

    Joined:
    24 Sep 2019
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi hoping someone can help...

    I have a valliant ecotech plus 637 installed in a refurbished property.

    The boiler will not heat the radiators as it keeps cycling to code S.07 pump overrun as the temperature shown on the boiler display rises from 40degrees c to 80 in the space of a few minutes.

    Radiators have been bled
    Shield valves on rads open
    Boiler isolation valves open (interestingly when these are closed the boiler continues running without overheating)

    Next steps will be to call an engineer out but wondering if im missing something straightforward and any advice appreciated i can use to sort myself.

    Thanks, Raj
     
  2. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    59,921
    Thanks Received:
    3,088
    Location:
    21st Century
    Country:
    Cook Islands
    sounds like you are misreading the isolation valves, and they are shut when you think they are open.

    Post photos of them please
     
    • Thanks Thanks x 1
    • Like Like x 1
  3. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    12,477
    Thanks Received:
    3,688
    Location:
    Lanarkshire
    Country:
    United Kingdom
    Agree with @JohnD , think you are mixing up the open and closed on the valves
     
    • Thanks Thanks x 1
  4. Raje

    Raje

    Joined:
    24 Sep 2019
    Messages:
    2
    Thanks Received:
    0
    Country:
    United Kingdom
    JohnD

    Thanks for your help - i turned the valves and left it on long enough and all radiators heated and hot water working.

    Not sure how the hot water and some of the heating has been working until now!

    I initially thought closed as outlet pipe was only getting hot in closed position.
     

    Attached Files:

  5. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    12,477
    Thanks Received:
    3,688
    Location:
    Lanarkshire
    Country:
    United Kingdom
    Yes the valves are open now, for others reading this the line on the nut that turns on the valve indicates the flow position of the valve, if inline then the valve is open, if across then the valve is closed
     
    • Thanks Thanks x 1
  6. ScottishGasMan

    ScottishGasMan

    Joined:
    22 Jan 2007
    Messages:
    6,038
    Thanks Received:
    1,993
    Country:
    United Kingdom
    How many radiators are you heating with that boiler?
     
    • Like Like x 1
  7. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    12,477
    Thanks Received:
    3,688
    Location:
    Lanarkshire
    Country:
    United Kingdom
    you are over thinking it lad , he had the iso valves closed
     
    • Like Like x 1
Loading...

Share This Page