Viessmann VITODENS 200-W WB2B Service Instructions For Contractors page 80

Troubleshooting
Fault codes
(cont.)
Fault Const. Weath.-
code comp.
on the
display
FC X X
Fd X X
FE X X
FF X X
80
System char- Cause
acteristics
Burner in a Gas train
fault state faulty or
faulty modu-
lation valve
control; or
flue gas path
blocked
Burner Fault at the
blocked burner con-
trol unit
Burner Strong inter-
blocked or in a ference
fault state (EMC) field
nearby or
faulty main
PCB
Burner Internal fault
blocked or in a or "E
fault state RESET" key
blocked.
Measures
Check the gas
train. Check the
flue gas system.
Press "E
RESET".
Check ignition
electrodes and
connecting
cables. Check the
boiler coding
card. Check
whether a strong
interference
(EMC) field exists
near the equip-
ment. Confirm
"E RESET" : Re-
place control unit
if the fault per-
sists.
Start the equip-
ment again. Re-
place the control
unit if the equip-
ment will not re-
start.
Start the equip-
ment again. Re-
place the control
unit if the equip-
ment will not re-
start.