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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Fault Messages
(continued)
Troubleshooting
Displayed
fault code
System characteristics Cause Measures
F.447,
F.448
Burner in a fault state Deviation, ionization
current signal
Replace BCU burner control unit:
See page 89.
Reset the boiler.
F.449,
F.450,
F.451,
F.452
Burner in a fault state Error in scheduled
program run
monitoring
Reset the boiler.
If fault recurs, replace BCU burner control unit:
See page 89.
F.453 Burner in a fault state Synchronization error,
sequence
Reset the boiler.
If fault recurs, replace BCU burner control unit:
See page 89.
F.454 Burner in a fault state Incorrect software
version
Flash the correct software version for the BCU burner
control unit.
F.455 Burner in a fault state Error in program run
monitoring
Reset the boiler.
If fault recurs, replace BCU burner control unit:
See page 89.
F.456 Burner in a fault state Error in program run
monitoring
Reset the boiler.
Check fan for sluggishness.
In the case of severe contamination or grinding noises,
replace fan unit.
F.457 Burner in a fault state Fan sluggish or
blocked.
Reset the boiler.
F.463 Burner in a fault state Contaminated
combustion air,
flue gas recirculation
Boiler installation and service instructions
Check flue system for contamination and flue gas
recirculation. Clean flue system if necessary.
Reset the burner.
Note: Deposits on the electrodes indicate foreign bodies
in the combustion air. Check the installation room and
flue system for causes of the deposits.
For example: Laundry detergents, cleaning agents,
toiletries, deposits in the ventilation air supply (chimney)
If flame body assembly and ionization electrode have
been replaced, also clean fan unit, gas/air channel and
Venturi extension.
Reset the boiler.
F.464 Burner in a fault state Ionization current too
low during calibration.
Differential compared
to previous value not
plausible.
Check ionization electrode and connecting cable.
Check plug-in connections for loose contacts.
Check whether there is a lot of dust in the ventilation
air (e.g. from construction work).
Check flue system. Remove flue gas recirculation
if necessary.
Check system for condensate backup.
Reset the boiler.
Note: To prevent water damage, detach fan unit before
removing the burner. Protect electronic components
from escaping condensate.
If fault is permanently present, replace the BCU burner
control unit: See page 89.
Note: Deposits on the electrodes indicate foreign bodies
in the combustion air. Check the installation room and
flue system for causes of the deposits.
For example: Laundry detergents, cleaning agents,
toiletries, deposits in the ventilation air supply (chimney)
If flame body assembly and ionization electrode have
been replaced, also clean fan unit, gas/air channel and
Venturi extension.
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