Ariston GENUS 27 PLUS Installation Instructions Manual page 56

FLUE TEST FEATURE
(only for authorised personnel)
The "C" Summer/Winter/Flue Test selector knob can be set to < > to
bypass temperature adjustment on the heating circuit for the purpose of
C
analysing the fumes produced by combustion.
To access this mode, open a water tap or taps so that the flow rate is
no less than 8 litres per minute.
Then press the "C" selector knob in and turn it from < > or < >
to the < >.
UT008Aq
WARNING!
The flue test feature eliminates the slow-light feature.
This mode must only be selected by a qualified service engineer.
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