Viessmann Vitodens 222-F Installation And Service Instructions For Contractors page 92

Troubleshooting
Fault codes
(cont.)
Fault code dis- System characteristics
played
81 Burner in a fault state
82 Burner in a fault state
83 Burner in a fault state
84 Burner in a fault state
92
Cause
No ignition spark
Flame signal at burner
start not present or insuffi-
cient.
Flame signal is already
present at burner start.
CO limit within appliance
exceeded
Measures
Check connecting cables and
leads from ignition module and ig-
nition electrode (see page 43).
Check for a voltage of 230 V~ at
plug 54 on the ignition module dur-
ing the ignition phase.
Check whether the ignition elec-
trode insulation is damaged.
Check the ionisation electrode and
connecting lead (see page 43).
Check plug-in connections for
loose contacts.
Note
Deposits on the electrodes indicate
foreign bodies in the ventilation air.
Check the installation room and
flue system for causes of the de-
posits. For example: laundry deter-
gents, cleaning agents, toiletries,
deposits in the ventilation air sup-
ply (chimney).
Check system for condensate
backup.
Note
To prevent water damage, detach
fan unit before removing the burn-
er.
Check ionisation and ignition elec-
trode for damage and earth faults
(e.g. contact with the thermal insu-
lation ring).
Check connecting leads from ioni-
sation and ignition electrode.
Replace control unit if fault is per-
manent.
Press reset button R.
Check entire flue gas path for the
following:
Flue gas recirculation
■
Leaks
■
Flue gas back pressure caused
■
by water pocket (if flue system
fall is insufficient)
Constrictions
■
Blockages
■
Repair flue system if necessary.
Press reset button R.