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Valiant ecotec 418 overshooting

Discussion in 'Plumbing and Central Heating' started by Reddwarf4ever, 28 Jan 2021.

  1. Reddwarf4ever

    Reddwarf4ever

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    Hello
    My boiler often overshoots the target temperature, many times, when first firing up. It shuts the boiler down if the flow temperature exceeds the target temperature by 3oC, although valiant tell me it should be 5oC (any reason why this should be so ? & can it be fixed ?) I wonder if I changed the Heating curve settings a little, this may reduce this ‘ overshooting’ and prevent too much boiler cycling.... D8AA6BAB-9738-43BA-BBB1-C149CD9FF354.jpeg
     
  2. muggles

    muggles

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    Heating curve usually refers to weather compensation. It sounds like you have poor circulation, an oversized boiler, or both.
     
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  4. Reddwarf4ever

    Reddwarf4ever

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    Ok, so are there any boiler settings to reduce the over firing at start up ? It modulated ok once stable....also what can I do about the cut out when flow temperature is 3oC above target, even Vaillant say should be 5oC....
    Circulation is fine.....just installed a new DAB 3 evosta pump & its pumping very well, the boiler is 18KW which is sized correct for my 12 rad detached house.
     
  5. Reddwarf4ever

    Reddwarf4ever

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    Would really appreciate it if Alex, or someone else with a good working knowledge of Vailant boilers could assist me thanks
     
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