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

Troubleshooting
Fault codes
(cont.)
Displayed Const.
fault code
E1 X
E2 X
E3 X
E4 X
E5 X
E7 X
E8 X
88
Weather- System characteris-
comp. tics
X Burner in a fault state Ionisation current
X Burner in a fault state Heating water flow
X Burner in a fault state Heat transfer too
X Burner blocked
X Burner blocked
X Burner in a fault state Ionisation current
X Burner in a fault state The ionisation cur-
Cause Measures
Check gap between ioni-
too high during cal- sation electrode and burn-
ibration er gauze assembly (see
page 38).
In open flue operation,
prevent high incidence of
dust in the combustion air.
Press reset button R.
Ensure adequate circula-
rate too low during tion volume.
calibration. Flow Check flow switch.
switch caused Remove scaling and
shutdown. blockages.
Press reset button R.
Ensure adequate heat
low during calibra- transfer.
tion. Press reset button R.
Temperature limiter
caused shutdown.
Fault, supply volt- Replace control unit.
age 24 V
Fault, flame ampli- Replace control unit.
fier
Check ionisation elec-
too low during cali- trode:
bration Distance to burner
■
gauze assembly (see
page 38)
Electrode contamination
■
Connecting lead and
■
plug-in connections
Check flue system; reme-
dy flue gas recirculation if
required.
Press reset button R.
Check gas supply (gas
rent lies outside pressure and gas flow
the permissible switch), gas train and
range connecting lead.
Check allocation of gas
type (see page 31).
Check ionisation elec-
trode:
Distance to burner
■
gauze assembly (see
page 38)
Electrode contamination
■
Press reset button R.