Viessmann VITODENS - Check Filter Is Displayed; External Program Is Displayed; External Hook-Up Is Displayed; Doors;Windows Are Difficult to Open

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Cause Remedy
In highly airtight buildings, e.g. a passive house:
The air flow rates for supply and extract air in your ven-
tilation unit are out of balance.
Notify your heating contractor.
Doors/windows bang when opened
Cause Remedy
In highly airtight buildings, e.g. a passive house:
The air flow rates for supply and extract air in your ven-
tilation unit are out of balance.
Notify your heating contractor.
What to do if...
Doors/windows are difficult to open
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