Viessmann Vitopend 100-W Installation And Service Instructions Manual page 69

Function sequence and possible faults
Yes
Burner in opera-
tion
Resetting the appliance
Hold down MODE and OK simultane-
ously until flashes (reset).
Overview of checks
Display
"IF"
"Ct"
"AL"
■ Use / to select the required
check.
– The selected check is shown on
the additional display.
– The value to be checked is shown
on the main display.
■ Press MODE to select the required
areas.
No
Shuts down below
the set boiler water
temperature and
restarts immediate-
ly
Area
Status checks (current/set values), see page 70
Meter checks, see page 71
Fault history (10 most recent fault messages)
For the meaning of the fault messages, see "Fault display"
from page 73
Diagnostics
(cont.)
Check the flue
system for leaks
(flue gas recircula-
tion); check the
gas flow pressure
69