Viessmann VITODENS 200-W Installation And Service Instructions Manual page 82

Troubleshooting
Fault codes
(cont.)
Fault code Const.
displayed
E2 X
E3 X
E4 X
E5 X
E6 X
E7 X
E8 X
82
Weather- System characteris-
comp. tics
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 blocked
X Burner in a fault state Ionisation current
X Burner in a fault state Ionisation current
Cause Measures
Ensure adequate circula-
rate too low during tion volume.
calibration. Flow Check flow switch.
switch has shut Remove scaling and
down. blockages.
Press reset button R.
Ensure adequate heat
low during calibra- transfer.
tion Press reset button R.
Temperature limiter
has shut down.
Fault, 24 V supply Replace control unit.
voltage
Flame amplifier Replace control unit.
fault
System pressure Top up with water.
too low
Check ionisation elec-
too low during cali- trode:
bration Distance to burner
■
gauze assembly (see
page 36)
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
lies outside the pressure and gas flow
permissible range switch), gas train and
connection pipe.
Check assignment of gas
type (see page 30).
Check ionisation elec-
trode:
Distance to burner
■
gauze assembly (see
page 36)
Electrode contamination
■
Press reset button R.