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Circulating pump?

  • 08-09-2015 2:48pm
    #1
    Wearb
    Moderators, Home & Garden Moderators Posts: 6,380 Mod ✭✭✭✭


    Just leaving a breakdown. Boiler tripping on high limit stat. Circulating pump at boiler is running. Water hot each side of it. Return to boiler still cold when boiler cuts out on its control stat. No motorised valves on system. Cylinder not heating either. Sealed system in 2 storey house wit pressure at 1.5 bar. Water available at bleed on upstairs rads.
    Btw the circulating pump is controlled by a stat on hot pipe at the boiler.

    Could the pump seem to be running ok and still not doing it's job? Any other ideas?
    I advised him to get a plumber, but I am curious.

    Please follow site and charter rules. "Resistance is futile"



Comments

  • #2
    K.Flyer
    Registered Users, Registered Users 2 Posts: 8,565 ✭✭✭K.Flyer


    Yep, pump can be spinning, but just not fast enough.
    Had the same problem recently on two potterton boilers.


  • #3
    sky6
    Registered Users, Registered Users 2 Posts: 1,444 ✭✭✭sky6


    Yes shaft or impeller could have broken off but pump motor still running. Probably best to swap out the pump to make sure and eliminate it.


  • #4
    corkgsxr
    Registered Users, Registered Users 2 Posts: 3,404 ✭✭✭corkgsxr


    sky6 wrote: »
    Yes shaft or impeller could have broken off but pump motor still running. Probably best to swap out the pump to make sure and eliminate it.

    Yep can show up after draining and filling too. Just not enough power to drive the air out


  • #5
    Wearb
    Moderators, Home & Garden Moderators Posts: 6,380 Mod ✭✭✭✭Wearb


    Is there any way to be sure? It would be an expensive replacement if it turned out to be something different.

    Please follow site and charter rules. "Resistance is futile"



  • #6
    Dtp1979
    Registered Users, Registered Users 2 Posts: 12,870 ✭✭✭✭Dtp1979


    Wearb wrote: »
    Is there any way to be sure? It would be an expensive replacement if it turned out to be something different.

    Stick on an old working pump and see if it sorts it first


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  • #7
    316
    Closed Accounts Posts: 243 ✭✭316


    ***removed as unhelpful***


  • #8
    Cerco
    Registered Users, Registered Users 2 Posts: 2,063 ✭✭✭Cerco


    Well that's one of the benefits of Boards. It gives everybody the opportunity to learn something, including fools who denigrate.


  • #9
    Wearb
    Moderators, Home & Garden Moderators Posts: 6,380 Mod ✭✭✭✭Wearb


    316 wrote: »
    **removed as unhelpful quote

    If you are referring to me, I am not a plumber.

    Please follow site and charter rules. "Resistance is futile"



  • #10
    corkgsxr
    Registered Users, Registered Users 2 Posts: 3,404 ✭✭✭corkgsxr


    316 wrote: »
    **removed as unhelpful.

    Everyone has to learn somewhere. Your not taught any of this in school.


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