Viessmann Vitodens 222-F Installation And Service Instructions For Contractors page 95

Fault codes
(cont.)
Fault code dis- System characteristics
played
F9 Burner in a fault state
FA Burner in a fault state
FC Burner in a fault state
FD Burner in a fault state
FE Burner in a fault state and ad-
ditional fault B7 is displayed.
FE Burner blocked or in a fault
state
FF Burner blocked or in a fault
state
Note
If subscriber faults occur, "Error, subscriber ..." is dis-
played.
Cause
Fan speed too low
Fan idle state or set speed
not reached
Fan unit faulty.
Burner control unit fault
Boiler coding card miss-
ing.
Boiler coding card or main
PCB faulty, or incorrect
boiler coding card
Internal fault or reset but-
ton R blocked.
Troubleshooting
Measures
Check fan, fan connecting cables
and fan power supply.
Press reset button R.
Check fan, check connecting ca-
bles to fan.
Press reset button R.
Check fan unit, replace if required.
Press reset button R.
Check ignition electrode, ionisation
electrode and connecting cables.
Check whether a strong interfer-
ence (EMC) field exists near the
appliance.
Press reset button R.
If the fault occurs sporadically, re-
place the coding card.
Replace control unit if fault is per-
manent.
Insert the boiler coding card.
Press reset button R.
Replace control unit if fault per-
sists.
Press reset button R. If the fault
persists, check the boiler coding
card and replace boiler coding card
or control unit if necessary.
Restart the appliance. Replace the
control unit if the appliance will not
restart.
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