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  1. R

    viessmann vitodens 100

    when the tap is running the temp went to 99 it read comfort underneath then the reset button started flashing and f2 came up on the lcd
  2. R

    viessmann vitodens 100

    when i run the hot water tap on my viessmann vitodens 100 boiler it goes hot cold hot cold i have changed the ignition tranformer but its still doing it you can hear it ignite then go off then on again any suggestions
  3. R

    vitodens 100

    my hot water tap runs hot and then cold and then hot again sometimes resulting in the reset button flashing with an F4 showing. can anybody tell me what the problem may be cheers
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