Viessmann Vitovalor PT2 E11T Installation And Service Instructions Manual page 115

Fault messages for gas condensing module
Fault number System characteristics
on the display
F.375 Burner in a fault state
(cont.)
Cause
Calibration failed Minimum
value or termination crite-
rion not reached
Troubleshooting
Measures
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.
115