Viessmann Vitodens 300 Service Instructions Manual page 77

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