Viessmann Vitovalor 300-P Installation And Service Instructions For Contractors page 120

Troubleshooting
Fault codes for gas condensing module
Fault code dis- System characteristics
played
E7 Burner in a fault state
E8 Burner in a fault state
EA Burner in a fault state
Eb Burner in a fault state
EC Burner in a fault state
Ed Burner in a fault state
EE Burner in a fault state
120
(cont.)
Cause
Ionisation current too low
during calibration
Ionisation current lies out-
side the permissible range
Ionisation current outside
permissible range during
calibration (excessive de-
viation from previous lev-
el)
Repeated flame loss dur-
ing calibration
Parameter error during
calibration
Internal fault
Flame signal at burner
start not present or insuffi-
cient.
Measures
Check ionisation electrode:
Distance to burner gauze assem-
■
bly (see page 78)
Electrode soiled
■
Connecting cable and plug-in
■
connections
Check flue system; remove flue
gas recirculation if required.
Press reset R.
Check gas supply (gas pressure
and gas flow switch), gas train and
connecting cable.
Check ionisation electrode:
Distance to burner gauze assem-
■
bly (see page 78)
Electrode soiled
■
Press reset R.
Check flue system; remove flue
gas recirculation if required.
In open flue operation, prevent
high levels of dust in the combus-
tion air.
Press reset R.
Following several unsuccessful re-
set attempts, replace the coding
card and press reset R.
Check gap between ionisation
electrode and burner gauze as-
sembly (see page 78).
Check flue system; remove flue
gas recirculation if required.
Press reset R.
Press reset R or
replace coding card and press re-
set R.
Replace control unit.
Check gas supply (gas pressure
and gas flow switch).
Check gas train.
Check ionisation electrode and
connecting cable.
Check ignition:
Connecting leads to ignition
■
module and ignition electrode
Ignition electrode gap and soiling
■
(see page 78).
Check condensate drain.
Press reset R.