Viessmann VITOLADENS 300-W Installation And Service Instructions Manual page 97

Fault codes
(cont.)
Displayed System characteris-
fault code tics
58 No DHW heating by
the boiler
90 Control mode
91 Control mode
92 No solar DHW heat-
ing
93 Control mode
94 No solar DHW heat-
ing
98 Control mode
99 Control mode
9A No solar DHW heat-
ing
9b Control mode
9C No solar DHW heat-
ing
9E Control mode
Cause
Lead break, cylin-
der temperature
sensor
Short circuit, tem-
perature sensor /
Short circuit, tem-
perature sensor
aÖ
Short circuit, col-
lector temperature
sensor
Short circuit, cylin-
der temperature
sensor
Short circuit, cylin-
der temperature
sensor
Lead break, tem-
perature sensor /
Lead break, tem-
perature sensor
aÖ
Lead break, collec-
tor temperature
sensor
Lead break, cylin-
der temperature
sensor
Lead break, cylin-
der temperature
sensor
No flow rate in col-
lector circuit or flow
rate too low, or
temperature limiter
has responded
Troubleshooting
Measures
Check sensors (see
page 105)
Check sensor / on solar
control module
Check sensor aÖ on solar
control module
Check temperature sen-
sor & on solar control
module or sensor on the
Vitosolic
Check temperature sen-
sor at connection S3 to
the Vitosolic.
Check temperature sen-
sor % on solar control
module or sensor on the
Vitosolic
Check sensor / on solar
control module
Check sensor aÖ on solar
control module
Check temperature sen-
sor & on solar control
module or sensor on the
Vitosolic
Check temperature sen-
sor at connection S3 to
the Vitosolic.
Check temperature sen-
sor % on solar control
module or sensor on the
Vitosolic
Check solar circuit pump
and solar circuit. Acknowl-
edge fault message
97