Viessmann B2UA, Installation And Service Instructions Manual, Page: 133 / 200

133
Displayed
fault code System characteris-
tics Cause Measures
E8 Burner in a fault
state The ionisation cur-
rent lies outside the
permissible range Check gas supply (gas
pressure and gas flow
switch), gas train and con-
necting lead.
Check allocation of gas
type (see page 52).
Check ionisation elec-
trode:
■ Distance to burner
gauze assembly (see
page 61)
■ Contamination of elec-
trode
Press reset button R .
EA Burner in a fault
state Ionisation current
outside permissi-
ble range during
calibration (devia-
tion from previous
level too great) Check flue system; reme-
dy flue gas recirculation if
required.
In open flue operation,
prevent high incidence of
dust in the combustion
air.
Press reset button
R .
Following several unsuc-
cessful reset attempts, re-
place the boiler coding
card and press reset but-
ton
R .
Eb Burner in a fault
state Repeated flame
loss during calibra-
tion Check gap between ioni-
sation electrode and burn-
er gauze assembly (see
page 61).
Check allocation of gas
type (see page 52).
Check flue system; reme-
dy flue gas recirculation if
required.
Press reset button
R .
Troubleshooting
Fault codes
(cont.)
5773 238 GB
Service