Vaillant Boiler Question

Discussion in 'Plumbing and Central Heating' started by RK_London, 20 Feb 2021.

  1. RK_London

    RK_London

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    I have an ecotec plus 637 boiler.

    I have a question - when the boiler starts ( heating mode 'burner on' when I look at the status) why does the temperature drop first before going up? Is that normal?
     
  2. cross thread

    cross thread

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    Yes, as it’s moving water from the boiler and cool water is coming in ,
     
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  4. RK_London

    RK_London

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    thank you - sometimes when the water temperature drops my radiators start banging - is that normal?
     
  5. ianmcd

    ianmcd

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    How often is your water pressure dropping ?
     
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  7. RK_London

    RK_London

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    not sure how to check that - I do know pressure is around 1bar when cold (30C) to about 1.8 bar at 75C
     
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