Central Heating Issue

Discussion in 'Plumbers' Talk' started by ART1990, Nov 26, 2023.

  1. ART1990

    ART1990 New Member

    Hi all, Looking for some advice and to see if anyone has experienced the issue I'm having with Central Heating. Two up Two down house, around a year ago I noticed the downstairs radiators were not working. As winter is approaching, I called a Plumber to come take a look, he advised a new boiler as the one I had was very old. New boiler fitted, same issue with the radiators downstairs, freezing cold. He's since tried using Sludge cleaner on the system and it hasn't really worked. Only two of 3 radiators upstairs work, and down stairs are all freezing. I have to close all radiators off bar 1 (that I want to heat) for it to work. When all Valves are open only two radiators work and the rest don't. Tried balancing, tried bleeding. Plumber is now talking about repiping, but I'm worried I could pay for that and it still not be the issue. Any advice or experience with similar?

    Thanks.
     
  2. terrymac

    terrymac Screwfix Select

    Where is the pump situated ?
    What type of system do you have ,sealed & pressurised ,or fed from a loft tank ?
    Got a hot water cylinder ?
     
  3. ART1990

    ART1990 New Member

    I have a Combi Boiler, Pressurised system. Only 6 radiators in the house so it's fairly simple.
     
  4. terrymac

    terrymac Screwfix Select

    You mentioned around a year ago you noticed downstairs rads were not working,prior to that did every radiator on the system heat fully ? If so ,what had been changed / altered on the heating system ?
     
  5. ART1990

    ART1990 New Member

    Yeah initially it all worked fine. Can't think of anything in particular that changed, aside from a very much Ageing boiler. Thanks for responding by the way.
     
  6. terrymac

    terrymac Screwfix Select

    If you close the TRV ( Thermostatic rad valve) on the two rads that heat fully, what's the result on all the rads that do not heat ?
    If you close every TRV ,but leave one downstairs radiators TRV fully open ,does that rad now heat fully ?
     
  7. ART1990

    ART1990 New Member

    So if I close the Rads that work I'll start to get heat to the back bedroom but downstairs still cold. If I turn them all off bar the large one in the living room, it starts to heat. To me that should rule out a blockage in the pipework? It's just not getting to them all at the same time when all open.
     
  8. terrymac

    terrymac Screwfix Select

    Sounds like an issue with the pump.
    If you can get every radiator to heat fully, individually with all others off, then the pipework to each one can't be blocked.
     
    WillyEckerslike likes this.
  9. ART1990

    ART1990 New Member

    Recently had a new Boiler fitted, would this not include a new circulating pump
     
  10. adgjl

    adgjl Screwfix Select

    Depends. Is it a combi or a system boiler? A system boiler will usually have an external pump.
     
  11. arrow

    arrow Screwfix Select

    A system boiler has an internal pump like a combi. A heat only or conventional boiler has an external pump.
     
  12. ART1990

    ART1990 New Member

    It's a combi boiler. Its just difficult because plumber is saying they need to repipe some of it but I feel like I'll throw more money at that and still be in the same position.
     
  13. terrymac

    terrymac Screwfix Select

    Yes ,combi has pump within it. Just because it's new doesn't mean it can't be duff.
    Can EVERY radiator be made to heat fully ,by turning all the other rads off, trying each in turn ? If so ,as already advised,the pipework can't be blocked.
     
    ART1990 likes this.
  14. Jimbo

    Jimbo Screwfix Select

    Or not fully blocked. If there is some flow like that at least (only one rad on at a time), it would provide a route for a chemical cleaner like x400 to do its job.
     
  15. Chris.M

    Chris.M Member

    I recently had a new boiler fitted & was told that I had to have a complete system clean otherwise it would affect my warranty. I just would have thought that with the problems you are having the system would have been cleaned? Or am I wrong?
     
  16. ART1990

    ART1990 New Member

    Yeah they've put x400 through the system and hasn't worked :-(
     
  17. Jimbo

    Jimbo Screwfix Select

    Did they make it go through each radiator in isolation?

    does the system have an external bypass valve fitted anywhere?
     

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