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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Fault Messages
(continued)
Fault Messages
(continued)
Troubleshooting
Fault Messages
(continued)
Displayed
fault code
System characteristics Cause
Measures
F.467
Burner in a fault state Gas supply insufficient
during calibration.
Contaminated or
insufficiently sized
gas line.
Test static gas pressure and gas flow pressure.
Check that on-site gas line and gas flow switch are
correctly sized.
Visually inspect gas solenoid valve inlet and strainer
on the inlet side for contamination.
Reset the boiler.
Note:
Contamination from a brazed gas line, for
example, can block up the gas solenoid valve strainer on
the inlet side.
F.468
Burner in a fault state Ionization current too
high during calibration
Check gap between ionization electrode and flame body
assembly.
Check whether there is a lot of dust in the ventilation air
(e.g. from construction work).
Reset the boiler.
Note:
Deposits on the electrodes indicate foreign bodies
in the ventilation 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.
F.471
No call for heat
Lead break or short
circuit
Check system (plug
dD
).
Check lead and plug-in connection.
Measure, to see if supply voltage to sensor is 5V–.
No call for heat
HMU heat
management unit
communication error
Check connecting cable between BCU burner control
unit and HMU heat management unit.
F.474
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.527
Burner in a fault state Incorrect parameter
set, HMU heat
management unit
Overwrite (flash) the HMU heat management unit with
the correct parameter set:
See page 89.
F.528
Burner in a fault state Incorrect parameter
set, BCU burner
control unit
Overwrite (flash) the BCU burner control unit with the
correct parameter set:
See page 89.
F.540
Burner in a fault state Condensate backup in
the heat cell
Check system for condensate backup.
Check the condensate drain and siphon trap.
Replace insulation blocks, electrodes
and flame body assembly if necessary.
Note:
To prevent water damage, detach fan unit before
removing the burner. Protect electronic components
from escaping condensate.
Reset the boiler.
Note:
If subscriber faults occur, “Fault, subscriber ...” is
displayed.
