Cold Radiators – desperate for help!

Discussion in 'Plumbing and Central Heating' started by T0Maz, 31 Jan 2013.

  1. T0Maz

    T0Maz

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    Hi All

    I have new boiler installed recently ( Eco Plus 831 ) with brand new pipework and I cannot get all my radiators to work. I can heat up 2-3 downstairs but rest is cold or 2-3 upstairs and the rest is cold.

    I can heat up separately any of them but not all together. I tried balancing in different combinations, valves open, half opened, closed, etc. and nothing. At the beginning the first one is hot and more radiators I join to the circuit the cooler they all become.


    Question: where the problem is?

    Pipework ?

    Pump?

    Lockshield valves?

    Something else?

    I appreciate any help.

    Tom
     
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  3. joe-90

    joe-90

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    Have a look at the 'sticky' about balancing. It works well.
     
  4. HERTS P&D

    HERTS P&D

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    Call the installer back!

    Andy
     
  5. T0Maz

    T0Maz

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    I tried balancing in all configurations even with measuring temperature on flow and return pipes.

    Installer was saying everything is fine with his work and this is a boiler's fault. Guy from the boiler says that the boiler is fine and now I just would like to know who is right. (Now installer stopped answering my phone calls)

    I thought that here I will be able to get at least possible causes or rule out some based on the symptoms so I can take further actions.

    Tom
     
  6. 1983

    1983

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    Did the rads heat up b4 boiler change?
    Have they been ok after boiler change and got worse?
    For whatever reason seems like a circulation problem, was the system flushed?
     
  7. T0Maz

    T0Maz

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    Circulation problem is what I would bet on. I just hope I do not need to do anything with the pipes.

    The boiler was fitted with new pipes and new rads. Before there was old system with 10mm pipes. Now I have 22mm going from the boiler and 15mm to the rads.

    I never had them working properly but was told that this is a balancing problem so I am balancing them for weeks now :(

    Tom
     
  8. bolshy

    bolshy

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    So you got one installer to do the rads and another to do the boiler? Go figure! You need to carefully balance the system - some radiator lockshields will only need to be open a quarter turn to get sufficient flow if they are nearest the boiler - fully open or half open for all rads isn't going to balance anything.
     
  9. T0Maz

    T0Maz

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    The same guy did both. When I say a boiler guy I mean the guy from Vaillant who I called to eliminate boiler failure.

    Balancing does not work. I turn valves by inches now and still the same. The one which was boiling hot gets cold and the one which was cold barely gets warm.
     
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  11. bolshy

    bolshy

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    Get the installer back to balance your system then - it's HIS responsibility. Has it ever worked? Check the benchmark has been filled out correctly in the MI. Do you have hot water?
     
  12. T0Maz

    T0Maz

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    I am trying to but it is always the same story - I am busy, try to balance them.

    I hope he will come soon, but I posted these questions to see if there is anything I can do myself to check where the problem is.

    I just would like to rule out possibility of pipework being design in a wrong way or blockage which cannot be sorted out without removing the floor.

    Hot water is absolutely fine and also when balancing at the beginning first 2-3 radiators are boiling hot but more rads join the circuit the cooler all become.
     
  13. Agile

    Agile

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    Was the installer gas safe registered?

    Did he complete the Benchmark Certificate?

    Do you know his registration number?

    If the pipework is correct then its difficult to think of why it should not run very well.

    Have you considered getting a local expert to have a look?

    Tony
     
  14. T0Maz

    T0Maz

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    As I was refurbishing the whole house it was done by a builder who was using contractors, so I have actually never seen a plumber. I have however his name somewhere in the papers and his number as well.

    I have managed to get hold of the builder so we will sort things out, however meanwhile I just wanted few hints what else could be checked or done by me.
     
  15. bolshy

    bolshy

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    Are you sure that the installer replaced all the 10mm pipes with 15mm? Or just the radiator tails? If microbore pipe isn't connected to 22mm using manifolds it can be a real pain to balance. If it's all 15mm onto 22mm main runs, then it should have plenty of flow. Are all of the TRVs fully open for balancing? Keep trying - shut all the lockshields except the first two rads, get first rad lockshield valve passing just enough water to get the radiator hot - in many cases you can hear the flow noise as water starts to move through the rad, move on to the second rad, do the same. Recheck the first rad, it may now need a little more flow - and I mean a little. Move on to the next radiator. And the next. Use SMALL adjustments to get them all hot, move on again. Don't move on until the rads you have opened up are decently hot. Check they are all fully bled. Did the installer fit a hydraulic bypass (auto bypass) ? If so, perhaps it's set too low or it's defective and passing heating flow straight back to the boiler. The system may be incorrectly piped as Tony says. If, as you say, the boiler is getting some rads hot, then the boiler at least appears to be working. Hope this helps. GET THE INSTALLER BACK!! ;)
     
  16. joe-90

    joe-90

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    He won't be back. He's making a grand a day on another bodge.
     
  17. Whitespirit66

    Whitespirit66

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    If you employed a builder, your contract is with him. Don't bother chasing his subbies, chase the builder to get it sorted.
     
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