Boiler Not Firing for Heating - Works for Hot Water

Discussion in 'Plumbing and Central Heating' started by Yan Pugh-Jones, 23 Oct 2021.

  1. Yan Pugh-Jones

    Yan Pugh-Jones

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    Hi looking for advice in where to start with fixing our boiler.

    The boiler doesn’t turn on when central heating only is on, but seems to work fine when hot water is on.

    Three way valve seems to be fine, in that radiators warm up when hot water and central heating are on, and cool when only hot water is on, so I’m guessing it’s an electric issue with either the heating thermostat, or connection between the controller and boiler.

    Any ideas? Thanks
     
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  3. terryplumb

    terryplumb

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    The mid position valve is probably your issue. Testing the voltages present at the wiring centre would establish this.
     
  4. ianmcd

    ianmcd

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    some pics of what controls , boiler etc that you have would help, is this a new problem or has it always been like this ?
     
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