Viessmann VITOPEND 200 - Page 82

Fault
code
on the
display
Const. Weath.-
comp.
System char-
acteristics
Cause Measures
59 X X No DHW heat-
ing
Outlet tem-
perature
sensor lead
broken
Check sensor
(see page 90)
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 error,
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 -
extension 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"
Fault codes (cont.)
82
Troubleshooting
5862 831 GB