Viessmann VITODENS 200-W Service Instructions Manual page 104

Troubleshooting
Fault codes
(cont.)
Dis- Const.
played
fault
code
Fd X
FE X
FF X
104
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 the fault per-
sists.
Boiler coding Press reset button
card or main R. Replace boiler
PCB faulty coding card or con-
trol unit if the fault
persists.
Internal fault Start the appliance
or reset but- again. Replace the
ton R control unit if the
blocked appliance will not
restart.