Viessmann Vitodens 222-F Installation And Service Instructions For Contractors page 93

Fault codes
(cont.)
Fault code dis- System characteristics
played
E8 Burner in a fault state
EB Burner in a fault state
EC Burner in a fault state
ED Burner in a fault state
Cause
Ionisation current lies out-
side the permissible range
Repeated flame loss or
deactivation during cali-
bration
Parameter error during
calibration
Internal fault
Troubleshooting
Measures
Check gas supply (gas pressure
and gas flow switch), gas train and
connecting cable.
Check assignment of gas type (see
page 35).
Check ionisation electrode:
Distance to burner gauze assem-
■
bly (see page 41)
Electrode contaminated
■
Press reset button R.
1. Check system for excessive
temperature. If fault F1 or F2 is
present, ensure there is ade-
quate heat transfer.
Press reset button R.
2. Check system for condensate
backup.
Note
To prevent water damage, de-
tach fan unit before removing
the burner.
Remove the condensate back-
up.
Press reset button R.
3. Check ionisation electrode for
contamination.
Check gap between ionisation
electrode and burner gauze as-
sembly (see page 41).
Press reset button R.
4. Check flue system; remove flue
gas recirculation if required.
Press reset button R.
Press reset button R or
replace boiler coding card and
press reset button R.
Replace control unit.
93