Viessmann VITOPEND 100-W Installation And Service Instructions Manual page 29

Further details regarding the individual steps
4.
Start the boiler with the higher
rated output (see page 18).
Note
No later than approx. 2 min, the
flue gas monitoring device should
switch OFF the burner and should
not switch it on again automatically
any sooner than after 15 min. For
safety reasons, the burner will be
locked out between 18 to 20 min.
As long as the flue gas monitoring
device locks out the burner the
green burner operation indicator
"A" will flash.
Commissioning, inspection, maintenance
(cont.)
5.
If the flue gas monitoring device
switches the burner OFF later
than after 2 min, check flue gas
monitoring sensor A (see
page 36) and replace it, if
required, e.g. if there are signs of
corrosion.
If the flue gas monitoring device
still does not shut down the burn-
er even after a new flue gas mon-
itoring sensor has been installed,
or if the burner does not start,
replace the control unit.
6. Shut down the boiler.
7. Clear the aperture and push the
flue pipe onto the draught hood.
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