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Vitodens 100-W, B1HA series & B1KA Combi Installation/Service
Troubleshooting
Diagnosis
Sequence of operation and potential faults during each start-up cycle
Fault display
In case of a fault, the display will show
and the fault
code.
If
flashes and “R” appears, the burner is locked.
See page 39.
For an explanation of the fault codes, see the following
table.
action
yes
yes
yes
yes
yes
no
no
no
no
no
display
Control unit issues a heat
demand
Fan starts
Ignition
Gas valve opens
Ionization current builds
(higher than 2
A Symbol
A
)
Burner in operation
After approx. 1 min, fault 9
Fault F4
Fault F4
Fault F4
Stops below the set boiler
water temperature and
restarts immediately
Increase set value and
ensure heat is drawn off
Check the fan, fan
connecting cables, power
at the fan and fan control
Check the ignition module
connection
Check the gas valve (120V
control voltage) and gas
supply pressure
Check electrode adjustment
and gas line for air locks
Check the flue system
for tightness (flue gas
recirculation); check the
gas flow pressure
no
