Viessmann VITODENS 200-W Installation And Service Instructions Manual page 88

Troubleshooting
Fault codes
(cont.)
Displayed Const.
fault code
EF X
F0 X
F1 X
F2 X
F3 X
F6 X
F8 X
F9 X
FA X
FC 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 Boiler water tem-
X Burner in a fault state Flame signal is al-
X Burner in a fault state Boiler water tem-
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,
Cause Measures
Check gas supply (gas
diately after it has pressure and gas flow
built (during the switch).
safety time). Check balanced flue sys-
tem for flue gas recircula-
tion.
Check ionisation elec-
trode (replace if required):
Distance to burner
■
gauze assembly (see
page 36)
Electrode contamination
■
Press reset button R.
Internal fault Replace control unit.
Check heating system fill
ture has exceeded level. Vent the system.
limit. Press reset button R after
flue system has cooled
down.
Check heating system fill
perature sensor level. Check circulation
has responded. pump. Vent the system.
Check boiler water tem-
perature sensor and con-
necting cables.
Press reset button R.
Check ionisation elec-
ready present at trode and connecting ca-
burner start. ble.
Press reset button R.
Replace boiler water tem-
perature sensor perature sensors
temperature values
vary too widely
from one another.
Check gas train. Check
too late. both control paths.
Press reset button R.
Check fan, fan connecting
during burner start cables and power supply;
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