Viessmann Vitovalor PT2 E11T Installation And Service Instructions Manual page 111

Fault messages for gas condensing module
Fault number System characteristics
on the display
F.357 Burner in a fault state
F.359 Burner in a fault state
F.361 Burner in a fault state
F.362 Burner in a fault state
(cont.)
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.
Troubleshooting
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.
When the system is restarted, the
gas flow switch may trip.
Reset burner.
Check connection cables and
leads from ignition module and ig-
nition electrode. See page 196.
Check for a voltage of 230 V
the ignition module during the igni-
tion phase.
Check whether the ignition elec-
trode insulation is damaged.
Reset burner.
Check the ionisation electrode and
connecting lead (see page 196).
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).
Reset burner.
Check system for condensate
backup.
Note
Avoid water damage. Detach fan
unit before removing the burner.
Cover the control unit with suitable
material.
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.
Reset burner.
Replace burner control unit if fault
is permanent.
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