Viessmann Vitovalor PT2 E11T Installation And Service Instructions Manual page 113

Fault messages for gas condensing module
Fault number System characteristics
on the display
F.369 Burner in a fault state
F.370 Burner in a fault state
F.371 Burner in a fault state
F.372 Burner in a fault state
F.373 Burner in a fault state
(cont.)
Cause
Flame is lost immediately
after flame formation (dur-
ing safety time).
Fuel valve or modulation
valve will not close.
Fan speed too low
Repeated flame loss dur-
ing calibration
Heat transfer too low dur-
ing calibration
Temperature limiter has
shut down.
Troubleshooting
Measures
Check gas supply (gas pressure
and gas flow switch).
Check balanced flue system for
flue gas recirculation.
Check ionisation electrode for the
following:
Distance to burner gauze assem-
■
bly (see page 72)
Contamination on electrode
■
Reset burner.
Check the gas train and replace if
required.
Reset burner.
Check the fan.
Check the fan connecting cables.
Check the fan power supply.
Reset burner.
Check the ionisation electrode and
connecting lead (see page 72).
Check plug-in connections for
loose contacts.
Check flue system; remove flue
gas recirculation if required.
Check system for condensate
backup.
Visually inspect gas train inlet and
strainer on the inlet side for con-
tamination.
Note
To prevent water damage, detach
fan unit before removing the burn-
er.
Note
Deposits on the electrodes indicate
foreign bodies in the combustion
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).
If burner gauze assembly and ioni-
sation electrode have been re-
placed, also clean fan unit, gas/air
channel and Venturi extension.
Reset burner.
Ensure adequate heat transfer.
Check circulation pump for faults,
scale or blockages.
Reset burner.
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