Viessmann Vitodens 242-F Installation And Service Instructions Manual page 98

Troubleshooting
Fault codes
(cont.)
Fault code dis- System characteristics
played
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
EF Burner in a fault state
F0 Burner blocked
F1 Burner in a fault state
98
Cause
Ionisation current outside
permissible range during
calibration (excessive de-
viation from previous lev-
el)
Repeated flame loss dur-
ing calibration
Parameter fault during cal-
ibration
Internal fault
Flame signal at burner
start not present or insuffi-
cient.
Flame is lost immediately
after it has formed (during
safety time).
Internal fault
Flue gas temperature lim-
iter has triggered.
Measures
Check flue system; remedy flue
gas recirculation if required.
In open flue operation, prevent
high incidence of dust in the com-
bustion air.
Press reset button R.
Following several unsuccessful re-
set attempts, replace the boiler
coding card and press reset button
R.
Check gap between ionisation
electrode and burner gauze as-
sembly (see page 50).
Check assignment of gas type (see
page 43).
Check flue system; remedy 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.
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 con-
■
tamination (see page 50).
Check condensate drain.
Press reset button R.
Check gas supply (gas pressure
and gas flow switch).
Check balanced flue system for
flue gas recirculation.
Check ionisation electrode (replace
if necessary):
Distance to burner gauze assem-
■
bly (see page 50)
Electrode contamination
■
Press reset button R.
Replace control unit.
Check heating system fill level.
Vent the system.
Press reset button R after flue sys-
tem has cooled down.