93
Fault code dis-
played
System characteristics
Cause
Measures
E8
Burner in a fault state
Ionisation current lies out-
side the permissible range
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
.
EB
Burner in a fault state
Repeated flame loss or
deactivation during cali-
bration
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
.
EC
Burner in a fault state
Parameter error during
calibration
Press reset button
R
or
replace boiler coding card and
press reset button
R
.
ED
Burner in a fault state
Internal fault
Replace control unit.
Troubleshooting
Fault codes
(cont.)
5778741
Diagnosis