Viessmann VITODENS 200-W Installation And Service Instructions Manual page 78

Troubleshooting
Fault codes
(cont.)
Fault code Const.
displayed
38 X
40
44
48
4C
50 X
58 X
90 X
91 X
92 X
93 X
94 X
98 X
99 X
9A X
9b X
78
Weather- System characteris-
comp. tics
X Burner blocked
X Mixer closes
X Mixer closes
X Mixer closes
X Mixer closes
X No DHW heating by
the boiler
X No DHW heating by
the boiler
X Control mode
X Control mode
X No solar DHW heat-
ing
X Control mode
X No solar DHW heat-
ing
X Control mode
X Control mode
X No solar DHW heat-
ing
X Control mode
Cause Measures
Lead break, boiler Check boiler water tem-
water temperature perature sensors (see
sensor page 87)
Short circuit, flow Check flow temperature
temperature sen- sensor (see page 90)
sor, heating circuit
2 (with mixer)
Short circuit, flow Check flow temperature
temperature sen- sensor (see page 90)
sor, heating circuit
3 (with mixer)
Lead break, flow Check flow temperature
temperature sen- sensor (see page 90)
sor, heating circuit
2 (with mixer)
Lead break, flow Check flow temperature
temperature sen- sensor (see page 90)
sor, heating circuit
3 (with mixer)
Short circuit, cylin- Check cylinder tempera-
der temperature ture sensor (see
sensor page 87)
Lead break, cylin- Check cylinder tempera-
der temperature ture sensor (see
sensor page 87)
Short circuit, tem- Check sensor
perature sensor control module.
/
Short circuit, tem-
Check sensor
perature sensor control module.
aÖ
Short circuit, col- Check temperature sen-
lector temperature sor &
sensor module or sensor on the
Vitosolic.
Short circuit, col- Check temperature sen-
lector return tem- sor at connection S3 on
perature sensor the Vitosolic.
Short circuit, cylin- Check temperature sen-
der temperature sor %
sensor module or sensor on the
Vitosolic.
Lead break, tem- Check sensor
perature sensor control module.
/
Lead break, tem-
Check sensor
perature sensor control module.
aÖ
Lead break, collec- Check temperature sen-
tor temperature
sor &
sensor module or sensor on the
Vitosolic.
Lead break, collec- Check temperature sen-
tor return tempera- sor at connection S3 on
ture sensor the Vitosolic.
on solar
/
aÖ on solar
on solar control
on solar control
/ on solar
aÖ on solar
on solar control