Viessmann VITOLADENS 300-W Installation And Service Instructions Manual page 103

Fault codes
(cont.)
Displayed System characteris-
fault code tics
Fb Burner in a fault
state
Fd Burner in a fault state
and additional fault
b7 is displayed
Fd Burner blocked
FE Burner blocked or in a
fault state
FF Burner blocked
Cause
3 x flame blow-off
during operation
Boiler coding card
is missing
Fault, burner con-
trol unit
Boiler coding card
or main PCB faulty,
or incorrect boiler
coding card
Internal fault
Troubleshooting
Measures
Check oil supply, check
nozzle.
Press reset button R.
Insert the boiler coding
card.
Press reset button R.
Replace control unit if
fault persists
Press reset button R. Re-
place control unit if the
fault persists.
Press reset button R. If
the fault persists, check
the boiler coding card and
replace boiler coding card
or control unit if necessa-
ry
Start the appliance again.
Replace the control unit if
the appliance will not re-
start
103