Fault
code
on the
display
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
CF
X
Control mode
Communica-
tion fault,
LON com-
munication
module
Replace the LON
communication
module.
dA
X
Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit A1
shorted out
Check the room
temperature sen-
sor, heating cir-
cuit A1.
db
X
Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit
with mixer
M2 shorted
out
Check the room
temperature sen-
sor, heating cir-
cuit with mixer
M2.
dd
X
Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit A1
lead broken
Check the room
temperature sen-
sor, heating cir-
cuit A1 and the
remote control
DIP switch set-
tings (see
page 101).
dE
X
Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit
with mixer
M2 lead bro-
ken
Check the room
temperature sen-
sor, heating cir-
cuit with mixer M2
and the remote
control DIP switch
settings (see
page 101).
E4
X
X
Burner
blocked
Supply vol-
tage fault
Replace the con-
trol unit.
Fault codes
(cont.)
76
Troubleshooting
5692
761
GB
Summary of Contents for Vitodens 200-W WB2B Series
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