Viessmann VITODENS 200-W Service Instructions Manual page 98

Troubleshooting
Fault codes
(cont.)
Dis- Const. Weath.-
played comp.
fault
code
48 X
4C X
50 X X
58 X X
90 X X
91 X X
92 X X
93 X X
94 X X
98
System char- Cause
acteristics
Mixer closes Lead break,
flow tempera-
ture sensor,
heating circuit
2 (with mixer)
Mixer closes Lead break,
flow tempera-
ture sensor,
heating circuit
3 (with mixer)
No DHW heat- Short circuit,
ing cylinder tem-
perature sen-
sor
No DHW heat- Lead break,
ing cylinder tem-
perature sen-
sor
Control mode Short circuit,
temperature
sensor /
Control mode Short circuit,
temperature
sensor aÖ
No DHW heat- Short circuit,
ing collector tem-
perature sen-
sor
Control mode Short circuit,
cylinder tem-
perature sen-
sor
No DHW heat- Short circuit,
ing cylinder tem-
perature sen-
sor
Measures
Check flow temper-
ature sensor
Check flow temper-
ature sensor
Check the cylinder
temperature sen-
sor (see
page 111)
Check the cylinder
temperature sen-
sor (see
page 111)
Check sensor /
on the solar control
module
Check sensor aÖ
on the solar control
module
Check temperature
sensor & on the
solar control mod-
ule or the Vitosolic
sensor
Check temperature
sensor at connec-
tion S3 to the
Vitosolic 100
Check temperature
sensor % on the
solar control mod-
ule or the Vitosolic
sensor