Viessmann VITODENS 300 WB3A, Service Instructions Manual

Page: 93 / 148

Displayed
fault code Const. Weat-
her-
comp. System
character-
istics Cause Remedy
30 X X Burner
blocked Boiler temperature
sensor shorted out Check the
boiler tem-
perature sen-
sor (see
page 87)
38 X X Boiler temperature
sensor lead break
40 X Mixer
closes Heating circuit M2
flow temperature
sensor shorted out Check the
flow tempera-
ture sensor
48 X Heating circuit M2
flow temperature
sensor lead break
50 X X No DHW
heating Cylinder tempera-
ture sensor shorted
out Check the
cylinder tem-
perature sen-
sor (see
page 87)
58 X X Cylinder tempera-
ture sensor lead
break
51 X X No DHW
heating Cylinder tempera-
ture sensor 2
shorted out Check the
cylinder tem-
perature sen-
sor (see
page 87)
59 X X Cylinder tempera-
ture sensor 2 lead
break
92 X X Control
mode Solar: Collector
temperature sensor
shorted out Check sensor
9A X X Collector tempera-
ture sensor lead
break
93 X X Control
mode Solar: Sensor S3
shorted out Check sensor
9b X X Sensor S3 lead
break
Checking and acknowledging faults
(cont.)
77
Troubleshooting
56
92
550
GB