81
Fault number
on the display
System characteristics
Cause
Measures
F.377
Burner in a fault state
Post-processing ionisation
current calibration: Stabili-
sation conditions for post-
calibration not reached
Check ionisation electrode and
connecting cable. 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 the appliance.
F.378
Burner in a fault state
Flame loss during stabili-
sation or operating phase
■
Check gas supply (gas pressure
and gas flow switch).
■
Check gas train.
■
Check system for condensate
backup.
Note
To prevent water damage, de-
tach fan unit before removing the
burner.
■
Check ionisation electrode and
connecting cable.
Check ignition:
■
Connecting cables to ignition
module and ignition electrode
■
Ignition electrode clearance and
contamination.
■
Check ignition electrode for bro-
ken ceramic.
Reset the appliance.
Troubleshooting
Fault messages
(cont.)
6130884
Service
