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Discuss Oil boiler flow switch tripping high limit stat in the Oil and Solid Fuel Forum area at

  1. SJB060685

    SJB060685 New Member

    Can someone explain to me exactly how a faulty flow switch can cause an oil combi to trip a high limit stat?
  2. oilmark

    oilmark New Member

    If flow switch sticks on then burner will continue to heat boiler but tap will not be taking away heat. Thermostats may not cut in quick enough.
    Warmflow combi?
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  3. Last Plumber

    Last Plumber Plumber GSR Top Contributor!!

    My thoughts were along the same line as oilmark. Could do with a bit more info though?
  4. SJB060685

    SJB060685 New Member

    Thanks for the reply. No it’s a Mistral. What you said was my understanding but just wanted a second opinion.
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