While you wait for answers, we may have found some information which could help you.
Click here for Fault Showing PanelWater pressure keeps dropping to 0 on gauge vitodens100-w ?
no heating?
how can i fix my viessmann boiler?
Error 38 viessmann 100w?
How can isolve a f5fault on a Viessman 100w 30kw combi?
How can I fix Viessman 100W?