Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 136

Troubleshooting
Fault codes
(cont.)
Dis- Const.
played
fault
code
Fd X
FE X
FF X
Note
In the case of subscriber faults, "Sub-
scriber fault ..." is displayed.
136
Weath.- System char-
comp. acteristics
X Burner in a fault
state
X Burner blocked
or in a fault
state
X Burner blocked
or in a fault
state
Cause Measures
Fault, burner Check ignition
control unit electrodes and
connecting cables.
Check whether a
strong interference
(EMC) field exists
near the appliance.
Press reset button
R
Replace control
unit if fault persists
Boiler coding Press reset button
card or main R. If the fault per-
PCB faulty, or sists, check the
incorrect boil- boiler coding card
er coding and replace boiler
card coding card or con-
trol unit if necessa-
ry
Internal fault Start the appliance
or reset but- again. Replace the
ton R control unit if the
blocked appliance will not
restart