Viessmann VITODENS 200-W Service Instructions Manual page 108

Troubleshooting
Fault codes
(cont.)
Dis- Const. Weath.-
played comp.
fault
code
FE X X
FF X X
108
System char- Cause
acteristics
Burner blocked Boiler coding
or in a fault card or main
state PCB faulty
Burner blocked Internal fault
or in a fault or reset but-
state ton R
blocked
Measures
Press reset button
R. Replace boiler
coding card or con-
trol unit if the fault
persists.
Start the appliance
again. Replace the
control unit if the
appliance will not
restart.