Viessmann Vitopend 100-W Installation And Service Instructions For Contractors page 38

Troubleshooting
Fault indicators on the display
Displayed System characteris-
fault code tics
0A Burner blocked
0C Burner blocked
0E Burner blocked
F2 Burner in a fault
state
F3 Burner in a fault
state
38
f 2
Faults are indicated by a flashing fault
code (e.g. "F2") and fault symbol U.
Cause
Gas supply pres-
sure too low
Mains voltage too
low
Flue gas monitor
has responded
Temperature limit-
er has responded
Flame signal is al-
ready present at
burner start
Measures
Check the gas pressure
and the gas pressure
switch
Check the power supply
Check the flue.
Note
If the flue gas monitor re-
sponds 10 times within a
24 h period, the burner en-
ters a fault state (fault
"F6" is displayed).
Check heating system fill
level. Check circulation
pump. Vent the system.
Check the temperature
limiter (see page 43)
and connecting cables.
To reset, briefly turn rotary
selector "tr" clockwise
as far as it will go and then
back again.
Check ionisation elec-
trode and connecting ca-
ble.
Turn ON/OFF switch 8
off and on again (or reset,
see F2).