Viessmann VITOPEND 200 - Page 86

Fault
code
on the
display
Const. Weath.-
comp.
System char-
acteristics
Cause Measures
F5 X X Burner control
unit fault
The air pres-
sure switch
is closed
during the
burner start
or does not
close when
the ignition
load speed
has been
reached
Check the ba-
lanced flue sys-
tem, the air
pressure switch
hoses, the air
pressure switch
and connecting
leads
F6 X X Burner control
unit fault
The gas
pressure
switch is
closed dur-
ing the burn-
er start or is
not closed at
the end of
the flame
stabilisation
phase
Check gas pres-
sure switch, gas
pressure and gas
train
F8 X X Burner in a
fault state
The fuel
valve closes
too late
Check the gas
train and both
control paths;
press
"E RESET"
F9 X X Burner in a
fault state
Fan speed
too low dur-
ing burner
start
Check the fan, fan
connecting
cables, fan power
supply and con-
trol; press
"E RESET"
FA X X Burner in a
fault state
Fan not at
standstill
Check the fan, fan
connecting cables
and fan control;
press "E RESET"
Fault codes (cont.)
86
Troubleshooting
5862 831 GB