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    Viessman vitodens 100 ( F4 )

    Yes mate. It's a combi. quite new. About two years old, I think. Was in when I bought house, but think it was newish
  2. A

    Viessman vitodens 100 ( F4 )

    My boiler has just started playing up. It's regularly serviced and up to date. Recently though it's started cutting out and I have no hot water or central heating. The reset button flashes red and F4 comes on the display. I can reset but sometimes it works after two or three presses, sometimes...
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