Display
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Remedy
CE
X
X
Control mode
Communica-
tion fault
–
ext. exten-
sion
Check connec-
tions and settings
of coding address
"2E".
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
M2 shorted
out
Check the room
temperature sen-
sor
–
heating cir-
cuit 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.
dE
X
Control mode
without room
influence
Room tem-
perature
sensor, heat-
ing circuit
M2 lead bro-
ken
Check the room
temperature sen-
sor
–
heating cir-
cuit M2.
E4
X
X
Burner
blocked
Internal fault
Replace the con-
trol unit.
Fault codes
(cont.)
79
Troubleshooting
5692
569
GB
Summary of Contents for Vitodens 300
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