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How can isolve a f5fault on a Viessman 100w 30kw combi?

How can isolve a f5fault on a Viessman 100w 30kw combi
Tony, March 2013
you need an engineer. its a flap inside the fan manifold. To get to it involes taking out the burner/fan assembly.

Denis Brown, March 2013
link Click here to see other fixes for Viessmann 100w.