Radiator comes on when hot water on

Discussion in 'Plumbing and Central Heating' started by Jl1010joanne, 2 Jun 2018.

  1. Jl1010joanne

    Jl1010joanne

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    Hi all,

    Looking for some advice...i have noticed that when our hot water is running, three radiators upstairs come on. Can anyone give some advice on what this could be? And if I get someone to fix it, how much would it cost?
    It' literally three radiators coming on. The rest of the radiators are cold.
    Thanks in advance
     
  2. JohnD

    JohnD

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    have you got a hot water cylinder?

    Look for one of these, probably near the pump and cylinder, might be near the boiler

    https://www.screwfix.com/search?search=port+valve

    for the moment, turn off the radiators (just finger tight, no great force)
     
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  4. Jl1010joanne

    Jl1010joanne

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    Thank you for your help. It's a combi boiler...just thought it's so strange that only 3 radiators come on
     
  5. 45yearsagasman

    45yearsagasman

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    The make/model of your combi would help.
     
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  7. Combicert

    Combicert

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    Get your boiler manual (or download it..)... check which the ‘flow’ pipe is - coming out your boiler. Turn it off using the isolator. Try and recreate the issue.

    Sounds like a diverter valve to me - probably worn over the years. It may be servicable but good chance its just a replacement... which may/may not require the system draining.


    Cost - probably £80 or so labour and the cost of the valve - depends on boiler type and ease of replacement.
     
  8. DIYnot Local

    DIYnot Local

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