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    Vailliant boiler issue (S.O -Heating issue, no heat demand)

    Hello, My Vailliant boiler was showing F.27 (incorrect sensing of flames). I opened the panel and replaced the 2A fuse. After that the boiler stopped responding. Status code now is S.O (Heating issue, no heat demand). Does not respond to opening hot water tap or turning on the radiator...
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