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Discuss Water pump issue? combi boiler in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Tuli

    Tuli New Member

    I have a heatline s-24 boiler. Recently when the heating is on, the radiators on the ground floor (where the boiler is) are cold (sometimes warmish at the top of the rad) while radiators in the upper floors are hot.
    From what I read online that means the pump is gone. However, sometimes, when the heating is on full blast for a while, all the radiators are hot all the way through. Does this still means the pump is broken? Does this suggest another issue?
    Would like to have an idea before I call an engineer as in the past they weren't all that helpful!
    • Optimistic Optimistic x 1
  2. SimonG

    SimonG Trusted Plumber

    Call a different engineer, if your last one was unhelpful.
    Last edited: Mar 25, 2019
  3. Harvest Fields

    Harvest Fields S. Mod Trusted Plumber GSR Top Contributor!!

    As above you need an engineer to look over the system.
  4. James Arce

    James Arce New Member

    I understand your point, well most of us have doubts when it comes to services. But try to search for qualified service provider online, anyway may determine it if they are good or not through their customer reviews.
  5. Tuli

    Tuli New Member

    I have booked an engineer for Monday, if anyone has any thoughts on the matter I would still be interested to hear so we are more clued up. Thanks!
  6. Darren Jackson

    Darren Jackson Plumber GSR

    Poor circulation is most often down to either a weak pump, possibly on it's way out; or due to sludge build up partially blocking the pipes and radiators. Your engineer will determine what is wrong and the best course of action.
  7. Stu-B

    Stu-B Active Member

    I’d look for sludge in the system if upstairs is getting hot but not downstairs, this would damage the pump by making it work harder
  8. Tuli

    Tuli New Member

    Thank you! That makes sense, will discuss with engineer next week.
  9. Tuli

    Tuli New Member

    So the engineer was just here and like you, he said it's either the pump or sludge... he did not give a definite reason, not sure what to do next, how can I decide? Should I get a different engineer?
    Replacing the pump can potentially cost a lot of money, so I dont want to go ahead if that's not the issue...
  10. Harvest Fields

    Harvest Fields S. Mod Trusted Plumber GSR Top Contributor!!

    Ask him what he would do. If he feels it is sludge I would power flush and change the pump at the same time.
  11. Chalked

    Chalked Plumber GSR

    All we do is an educated guess. Removing the pump will give an indication. Best to get the system cleaned anyway, as your symptoms say it is.
  12. Darren Jackson

    Darren Jackson Plumber GSR

    Did he remove the screw in the front of the pump and test how strong the impeller was spinning? Without even coming out to see the job we can already surmise it is either the pump or sludge or both! So you're no better off than before your engineer came out!
    How handy are you at DIY? Do you feel confident enough to take off a radiator and connect it to a garden hose pipe to flush it out yourself. If you find it is full of sludge then you should think about putting a good cleaner in the system for a few days and then having a powerflush performed adding a decent mag filter at the same time and then a good quality inhibitor put in for long term protection.
    As your pump is in the boiler casing you will have to leave that for an engineer to test and replace if it is necessary.
    I would also suggest you find a different engineer that last one was not very helpful at all and left you with the same problem and the same question, is it sludge, the pump or even both???
  13. fixitflav

    fixitflav Active Member

    Do you have TRVs downstairs, and if so, is the room at or above the TRV setting? There may be nothing wrong, you could try opening the TRVs wider. Long shot but worth considering before you get the plumbing kit out.
    • Agree Agree x 1
  14. Tuli

    Tuli New Member

    Hi all,
    @Darren@Darren No, the engineer did not test anything, and when I asked questions he said maybe I should just 'live with this issue' or 'replace the boiler'. So yes, maybe I should find someone that can diagnose the issue before we spend £300 on replacing a pump that may be still working.
    So in theory when I call an engineer they should be able to open the boiler and diagnose whether the pump is working rather than an educated guess?
    Thanks in advance,
  15. Millsy 82

    Millsy 82 Plumber GSR Top Contributor!!

    Ignore me didn't read all the posts.
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