119
Dis-
played
fault
code
Const.
Weath.-
comp.
System char-
acteristics
Cause
Measures
4C
X
Mixer closes
Lead break,
flow tempera-
ture sensor,
heating circuit
3 (with mixer)
Check flow temper-
ature sensor (see
page 142)
50
X
X
No DHW heat-
ing by the boil-
er
Short circuit,
cylinder tem-
perature sen-
sor
Check cylinder
temperature sen-
sor (see
page 137)
58
X
X
No DHW heat-
ing by the boil-
er
Lead break,
cylinder tem-
perature sen-
sor
Check cylinder
temperature sen-
sor (see
page 137)
90
X
X
Control mode
Short circuit,
temperature
sensor
/
Check sensor
/
on solar control
module.
91
X
X
Control mode
Short circuit,
temperature
sensor
aÖ
Check sensor
aÖ
on solar control
module.
92
X
X
No solar DHW
heating
Short circuit,
collector tem-
perature sen-
sor
Check temperature
sensor
&
on solar
control module or
sensor on the
Vitosolic.
93
X
X
Control mode
Short circuit,
cylinder tem-
perature sen-
sor
Check temperature
sensor at terminal
S3 to the Vitosolic.
94
X
X
No solar DHW
heating
Short circuit,
cylinder tem-
perature sen-
sor
Check temperature
sensor
%
on solar
control module or
sensor on the
Vitosolic.
98
X
X
Control mode
Lead break,
temperature
sensor
/
Check sensor
/
on solar control
module.
Troubleshooting
Fault codes
(cont.)
5585 174 GB
Service