Viessmann VITODENS 200-W B2HA Installation And Service Instructions Manual page 88

Troubleshooting
Fault codes
(cont.)
Fault code Const.
displayed
30 X
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
88
Weather- System characteris-
comp. tics
X Burner blocked
X Burner blocked
X Mixer being closed
X Mixer being closed
X Mixer being closed
X Mixer being closed
X No DHW heating by
the boiler
X No DHW heating
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
Cause Measures
Short circuit, boiler Check boiler water tem-
water temperature perature sensors (see
sensor page 96)
Lead break, boiler Check boiler water tem-
water temperature perature sensors (see
sensor page 96)
Short circuit, flow Check flow temperature
temperature sen- sensor (see page 98)
sor, heating circuit
2 (with mixer)
Short circuit, flow Check flow temperature
temperature sen- sensor (see page 98)
sor, heating circuit
3 (with mixer)
Lead break, flow Check flow temperature
temperature sen- sensor (see page 98)
sor, heating circuit
2 (with mixer)
Lead break, flow Check flow temperature
temperature sen- sensor (see page 98)
sor, heating circuit
3 (with mixer)
Short circuit, cylin- Check cylinder tempera-
der temperature ture sensor (see
sensor page 96)
No DHW heating Check cylinder tempera-
by the boiler ture sensor (see
page 96)
Short circuit, tem- Check sensor
perature sensor control module.
/
Short circuit, tem-
Check sensor
perature sensor aÖ control module.
Short circuit, col- Check temperature sen-
lector temperature
sor &
sensor module or sensor on the
Vitosolic.
Short circuit, cylin- Check temperature sen-
der temperature sor at terminal S3 on the
sensor 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 aÖ control module.
Lead break, collec- Check temperature sen-
tor temperature sor
&
sensor
module or sensor on the
Vitosolic.
/ on solar
aÖ on solar
on solar control
on solar control
/ on solar
on solar
aÖ
on solar control