Viessmann VITODENS 200-W Installation And Service Instructions Manual page 98

Troubleshooting
Fault messages
(cont.)
Displayed fault System characteristics
code
80 Burner in a fault state
81 Burner in a fault state
82 Burner in a fault state
83 Burner in a fault state
98
Cause
Insufficient gas supply
No ignition spark
Flame signal is not
present or insufficient at
burner start.
Flame signal is already
present at burner start.
Measures
Test static gas pressure and gas
flow pressure.
Check that on-site gas line and gas
flow switch are correctly sized.
Note
If the building pressure regulator
has a leak, you may notice rising
pressure when the burner is idle.
The gas flow switch may respond if
the system is restarted.
Check connecting cables and
leads from ignition module and ig-
nition electrode (see page 44).
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 44).
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 de-
tergents, cleaning agents, toilet-
ries, deposits in the ventilation air
supply (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 cables from ioni-
sation and ignition electrode.
Replace control unit if fault is per-
manent.
Press reset button R.