Viessmann GENO-Neutra V N-70 Installation And Service Instructions Manual page 14

Function description
For part no. 7441823, above the drain
connector is an overflow aperture,
which, when the condensate drain is
obstructed, enables the condensate to
escape from the neutralising container.
Parts list for part no. 7441823
When ordering spare parts:
Quote the part no. (see type plate) and
its position number (as per this parts
list).
005
001
14
(cont.)
002
004
Standard parts are available from your
local supplier.
006
007
009
008