Viessmann Vitodens 333 Service Instructions Manual page 76

Troubleshooting
Checking and acknowledging faults
Display 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
94 X
76
Weat- System
h. 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
X Control
mode
(cont.)
Cause Remedy
Boiler temperature Check boiler
sensor shorted out temperature
sensor (see
page 84)
Boiler temperature
sensor lead break
Heating circuit M2 Check flow
flow temperature temperature
sensor shorted out sensor
Heating circuit M2
flow temperature
sensor lead break
Cylinder tempera- Check sen-
ture sensor/comfort sors (see
sensor/loading page 84)
sensor shorted out
Cylinder tempera-
ture sensor/comfort
sensor/loading
sensor lead break
Cylinder tempera- Check sen-
ture sensor 2/outlet sors (see
sensor shorted out page 84)
Cylinder tempera-
ture sensor 2/outlet
sensor 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
Solar: Cylinder Check sensor
temperature sensor
shorted out