Viessmann Vitocrossal 100 Series Service Instructions For Contractors page 75

Fault codes
(cont.)
Fault code dis- System characteristics
played
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
F2 Burner in a fault state
F3 Burner in a fault state
F6 Burner in a fault state
Cause
Repeated flame loss dur-
ing calibration
Parameter error during
calibration
Internal fault
Flame signal is not
present or insufficient at
burner start.
Flame is lost immediately
after it has built (during
safety time).
Internal fault
Flue gas temperature lim-
iter has responded.
Temperature limiter has
responded.
Flame signal is already
present at burner start.
Temperature values of the
boiler water temperature
sensors vary too widely
from one another.
Troubleshooting
Measures
Check gap between ionisation
electrode and burner gauze as-
sembly (see page 21).
Check flue system; remove flue
gas recirculation if required.
Press reset button R.
Press reset button R.
or
Replace coding card and then
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 cables to ignition
■
module and ignition electrode
Ignition electrode gap and con-
■
tamination (see page 21).
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 required):
Distance to burner gauze assem-
■
bly (see page 21)
Contamination on electrode
■
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.
Check heating system fill level.
Check circulation pump. Vent the
system. Check temperature limiter
and connecting cables.
Press reset button R.
Check ionisation electrode and
connecting cable.
Press reset button R.
Replace boiler water temperature
sensors
75