Viessmann 7838380 Notice De Montage page 18

GB
Additional fault codes
In conjunction with the new control unit, the following fault codes can addi-
tionally be displayed:
Dis- System charac-
played teristics
fault
code
E1 Burner in a fault
state
E2 Burner in a fault
state
E3 Burner in a fault
state
E7 Burner in a fault
state
18
Cause of fault
Ionisation current too
high during calibration
Heating water flow rate
too low during calibra-
tion. Flow switch has
shut down.
Heat transfer too low
during calibration.
Temperature limiter has
shut down.
Ionisation current too
low during calibration
Measure
Check gap between ioni-
sation electrode and
burner gauze assembly
(see service instruc-
tions).
In open flue operation,
prevent high levels of
dust in the combustion
air.
Press reset button R.
Ensure adequate circula-
tion volume. Check flow
switch. Remove scaling
and blockages.
Press reset button R.
Ensure adequate heat
transfer.
Press reset button R.
Check ionisation elec-
trode (see service in-
structions):
■ Clearance to burner
gauze assembly
■ Contamination on elec-
trode
■ Connecting cable and
plug-in connections
Check flue system; re-
move flue gas recircula-
tion if necessary.
Press reset button R.