Viessmann Vitodens 333 Service Instructions Manual page 73

Fault codes
(cont.)
Display Const. Weath.
fault comp.
code
30 X X
38 X X
40 X
48 X
50 X X
51 X X
58 X X
59 X X
A7 X
System char- Cause
acteristics
Burner Boiler water
blocked temperature
sensor
shorted out
Burner Boiler water
blocked temperature
sensor lead
broken
Mixer closes Mixer circuit
M2 flow tem-
perature
sensor
shorted out
Mixer closes Mixer circuit
M2 flow tem-
perature
sensor lead
broken
No DHW heat- Cylinder pri-
ing mary tem-
perature
sensor
shorted out
No DHW heat- Outlet tem-
ing perature
sensor
shorted out
No DHW heat- Cylinder pri-
ing mary tem-
perature
sensor lead
broken
No DHW heat- Outlet tem-
ing perature
sensor lead
broken
Control mode Faulty pro-
as per the de- gramming
livered condi- unit
tion
Troubleshooting
Remedy
Check the boiler
water tempera-
ture sensor (see
page 81)
Check the boiler
water tempera-
ture sensor (see
page 81)
Check the flow
temperature sen-
sor
Check the flow
temperature sen-
sor
Check sensors
(see page 81)
Check sensors
(see page 81)
Check sensors
(see page 81)
Check sensors
(see page 81)
Replace the pro-
gramming unit
73