Viessmann B2TA, Installation And Service Instructions For Contractors

Page: 87 / 144

87
Fault code
displayed Const. Weather-
comp. System characteris-
tics Cause Measures
EA X X Burner in a fault state Ionisation current
outside permissible
range during cali-
bration (excessive
deviation from pre-
vious level)
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 X X Burner in a fault state Repeated flame
loss during calibra-
tion
Check gap between ioni-
sation electrode and burn-
er gauze assembly (see
page 37).
Check assignment of gas
type (see page 37).
Check flue system; reme-
dy flue gas recirculation if
required.
Press reset button
R .
EC X X Burner in a fault state Parameter fault
during calibration
Press reset button R or
Replace boiler coding
card and press reset but-
ton
R .
Ed X X Burner in a fault state Internal fault Replace control unit.
EE X X Burner in a fault state Flame signal at
burner start not
present or insuffi-
cient.
Check gas supply (gas
pressure and gas flow
switch).
Check gas train.
Check ionisation elec-
trode and connecting ca-
ble.
Check ignition:
■
Connecting leads to ig-
nition module and igni-
tion electrode
■
Ignition electrode gap
and contamination (see
page 37).
Check condensate drain.
Press reset button
R .
Troubleshooting
Fault codes
(cont.)
5773 216 GB
Diagnosis