Viessmann Vitodens 222-F Installation And Service Instructions For Contractors page 88

Troubleshooting
Fault codes
(cont.)
Fault code Const.
displayed
EF X
F0 X
F1 X
F2 X
F3 X
F8 X
F9 X
FA X
FC X
Fd X
88
Weather- System characteris-
comp. tics
X Burner in a fault state Flame is lost imme-
X Burner blocked
X Burner in a fault state Flue gas tempera-
X Burner in a fault state Temperature limiter
X Burner in a fault state Flame signal is al-
X Burner in a fault state Fuel valve closes
X Burner in a fault state Fan speed too low
X Burner in a fault state Fan idle state not
X Burner in a fault state Gas train faulty,
X Burner in a fault state
and additional fault
b7 is displayed
Cause Measures
Check gas supply (gas
diately after it has pressure and gas flow
formed (during switch).
safety time). Check balanced flue sys-
tem for flue gas recircula-
tion.
Check ionisation elec-
trode (replace if necessa-
ry):
Distance to burner
■
gauze assembly (see
page 37)
Electrode contamination
■
Press reset button R.
Internal fault Replace control unit.
Check heating system fill
ture limiter has trig- level. Vent the system.
gered. Press reset button R after
flue system has cooled
down.
Check heating system fill
has triggered. level. Check circulation
pump. Vent the system.
Check temperature limiter
and connecting cables.
Press reset button R.
Check ionisation elec-
ready present at trode and connecting ca-
burner start. ble.
Press reset button R.
Check gas train. Check
too late. both control paths.
Press reset button R.
Check fan, fan connecting
during burner start cables and power supply
to fan; check fan control.
Press reset button R.
Check fan, fan connecting
reached cables and fan control.
Press reset button R.
Check gas train. Check
faulty modulation flue system.
valve control or Press reset button R.
flue gas path
blocked
Boiler coding card Insert the boiler coding
missing card.
Press reset button R.
Replace control unit if
fault persists.