Viessmann FB2B Installation And Service Instructions Manual page 110

Troubleshooting
Fault codes
(cont.)
Displayed System characteris-
fault code tics
E8 Burner in a fault
state
EA Burner in a fault
state
Eb Burner in a fault
state
110
Cause Measures
The ionisation cur- Check gas supply (gas
rent lies outside the pressure and gas flow lim-
permissible range iter), gas train and con-
necting lead.
Check allocation of gas
type (see page 32).
Check ionisation elec-
trode:
■ Distance to burner
■ Contamination of elec-
Press reset button R.
Ionisation current Check flue system; rem-
outside the permis- edy flue gas recirculation
sible range during if required.
calibration (devia- In open flue mode, pre-
tion from previous vent very dusty conditions
level too great) for the combustion air.
Press reset button R.
Following several unsuc-
cessful reset attempts,
replace boiler coding card
and press reset button R.
Repeated flame Check gap between ioni-
loss during calibra- sation electrode and
tion burner gauze assembly
(see page 40).
Check allocation of gas
type (see page 32).
Check flue system; rem-
edy flue gas recirculation
if required.
Press reset button R.
gauze assembly (see
page 40)
trode