Viessmann VITODENS 242-F Installation And Service Instructions Manual page 133

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
Cause
The ionisation cur-
rent lies outside the
permissible range
Ionisation current
outside permissi-
ble range during
calibration (devia-
tion from previous
level too great)
Repeated flame
loss during calibra-
tion
Troubleshooting
Measures
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.
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.
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.
133