Viessmann VITOPEND 200, Installation And Service Instructions For Contractors

Page: 83 / 132

Fault
code
on the
display Const. Weath.-
comp. System char-
acteristics Cause Measures
A7 X Control mode
as per the de-
livered condi-
tion Faulty pro-
gramming
unit Replace program-
ming unit
b1 X X Control mode
as per the de-
livered condi-
tion Communica-
tion fault,
program-
ming unit 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 the de-
livered condi-
tion Internal fault Replace the con-
trol unit
b7 X X Burner
blocked Boiler coding
card fault Plug in boiler cod-
ing card or re-
place, if faulty
bA X Mixer regu-
lates to 20 °C
flow tempera-
ture Communica-
tion fault, ex-
tension kit
for heating
circuit M2 Check the exten-
sion kit connec-
tions and
encoding; start
the extension kit
bC X Control mode
without remote
control Communica-
tion fault
–
Vitotrol re-
mote control,
heating cir-
cuit A1
Check connec-
tions, cable/lead
and coding ad-
dress "A0"
bd X Control mode
without remote
control Communica-
tion fault,
Vitotrol re-
mote control,
heating cir-
cuit M2 Check connec-
tions, cable/lead
and coding ad-
dress "A0"
Fault codes
(cont.)
83
Troubleshooting
5592
817
GB
Service