Viessmann VITODENS 200-W Installation And Service Instructions Manual page 84

Troubleshooting
Fault codes
(cont.)
Displayed Const.
fault code
28 X
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
84
Weather- System characteris-
comp. tics
X Regulates without
flow temperature sen-
sor (low loss header)
X Burner blocked
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
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
Cause Measures
Lead break, sys- Check low loss header
tem flow tempera- sensor (see page 92)
ture sensor If no low loss header sen-
sor is connected, set code
52:0.
Short circuit, boiler Check boiler water tem-
water temperature perature sensors (see
sensor page 92)
Lead break, boiler Check boiler water tem-
water temperature perature sensors (see
sensor page 92)
Short circuit, flow Check flow temperature
temperature sen- sensor (see page 96)
sor, heating circuit
2 (with mixer)
Short circuit, flow Check flow temperature
temperature sen- sensor (see page 96)
sor, heating circuit
3 (with mixer)
Lead break, flow Check flow temperature
temperature sen- sensor (see page 96)
sor, heating circuit
2 (with mixer)
Lead break, flow Check flow temperature
temperature sen- sensor (see page 96)
sor, heating circuit
3 (with mixer)
Short circuit, cylin- Check cylinder tempera-
der temperature ture sensor (see
sensor page 92)
No DHW heating Check cylinder tempera-
by the boiler ture sensor (see
page 92)
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, cylin- Check temperature sen-
der temperature sor at connection S3 on
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
on solar
/
aÖ on solar
on solar control
on solar control
on solar
/
aÖ on solar