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  1. U

    Vaillant ecotec plus 624 does not stop firing / heating

    Hallo, I have above boiler since around 3 1/2 years with two Honeywell CM707 thermostats, one for upstairs and one for downstairs. Worked brilliantly for 2 years and still does the job in summer for hot water, but now as soon as heating season comes, boiler often stays on and fires no end...
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