Fault
code
on the
display
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
b1
X
X
Control mode
as per deliv-
ered condition
Communica-
tion fault;
program-
ming unit (in-
ternal)
Check connec-
tions and replace
the programming
unit if required.
b4
X
X
Regulates as
if the outside
temperature
was 0 °C
Internal fault
Replace the con-
trol unit.
b5
X
X
Control mode
as per deliv-
ered condition
Internal fault
Replace the con-
trol unit.
b7
X
X
Burner
blocked
Boiler coding
card miss-
ing, faulty or
incorrect
boiler coding
card
Plug in boiler cod-
ing card or re-
place it, if faulty.
bA
X
Mixer M2 reg-
ulates to a
flow tempera-
ture of 20 °C.
Communica-
tion fault
–
extension kit
for heating
circuit M2
Check the exten-
sion kit connec-
tions and coding.
Start the exten-
sion kit.
bC
X
Control mode
without remote
control
Communica-
tion fault
–
Vitotrol re-
mote control,
heating cir-
cuit A1
Check connec-
tions, cable, cod-
ing address "A0"
and remote con-
trol DIP switches
(see page 101).
bd
X
Control mode
without remote
control
Communica-
tion fault,
Vitotrol re-
mote control,
heating cir-
cuit M2
Check connec-
tions, cable, cod-
ing address "A0"
and remote con-
trol DIP switches
(see page 101).
bE
X
Control mode
Vitotrol re-
mote control
incorrectly
programmed
Check remote
control DIP switch
settings (see
page 101).
Fault codes
(cont.)
74
Troubleshooting
5692
761
GB
Содержание Vitodens 200-W WB2B Series
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