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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Fault Messages
(continued)
Troubleshooting
Displayed
fault code
System characteristics Cause
Measures
F.359
Burner in a fault state
No ignition spark
Check whether the ignition electrode insulation is
damaged.
Check for a voltage of 120V~ at the ignition module
during the ignition phase. If not, replace the BCU
burner control unit.
If 120V~ is present at the ignition module but there
is still a fault, replace the ignition module.
Check connecting cables and leads from ignition
module and ignition electrode.
Reset the boiler.
Check the condensate system for a backup or clog,
replace the insulation blocks, electrodes and flame
body if necessary.
F.361
Burner in a fault state
Flame signal is not
present or insufficient
at burner start.
Check ionization electrode and connecting cable.
Check plug-in connections for loose contacts.
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).
Reset the boiler
F.366,
F.367
Burner in a fault state
Gas valve electricity
supply does not
turn off.
Replace BCU burner control unit:
See page 89.
F.369
Burner in a fault state
Flame loss immediately
after flame formation
(during safety time)
Check gas supply (gas pressure and gas flow switch).
Check balanced flue system for flue gas recirculation.
Check ionization electrode:
Clearance to flame body assembly.
Contamination on electrode.
Reset the boiler.
F.370
Burner in a fault state
Fuel valve or
modulation valve will
not close.
Reset the boiler.
If fault occurs repeatedly, replace fan unit.
F.372
Burner in a fault state
Repeated flame loss
during calibration
Check ionization electrode and connecting cable.
Check plug-in connections for loose contacts.
Check flue system.
Remove flue gas recirculation if necessary.
Check system for condensate backup.
Visually inspect gas solenoid valve inlet and strainer
on the inlet side for contamination.
Note:
To prevent water damage, detach fan unit before
removing the burner. 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.373
Burner in a fault state
Heat transfer too low
during calibration
Temperature limiter
has shut down.
Ensure adequate heat transfer.
Check circulation pump for faults, scale or blockages.
Check 3-way diverter valve function in actuator test.
Vent the system.
Check function of flow sensor.
Reset the boiler.
