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  1. Plumbergasfitter

    Viessmann F1 fault code

    Hello everyone. I have a Vitodens WB2B 105 Fault code F1.( Flue gas temperature has exceeded 230 deg F ) . Boiler water temperature reaches 115deg then the burner ramps up to high fire . The flue gas temperature goes up to 150 deg then faults out . Replaced the 12 yr old sensor no change ...
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