Viessmann Vitocrossal 300 Service Instructions For Contractors page 97

Fault codes
(cont.)
Displayed System characteris-
fault code tics
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
9F Control mode
A7 Control mode as per
delivered condition
b0 Burner blocked
Cause
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
Solar control mod-
ule or Vitosolic
faulty
Programming unit
faulty
Short circuit, flue
gas temperature
sensor
Troubleshooting
Measures
Check temperature sen-
sor & on solar control
module or Vitosolic sen-
sor
Check temperature sen-
sor at connection S3 to
Vitosolic 100
Check temperature sen-
sor % on solar control
module or Vitosolic sen-
sor
Check sensor / on solar
control module
Check sensor aÖ on solar
control module
Check temperature sen-
sor & on solar control
module or Vitosolic sen-
sor
Check temperature sen-
sor at connection S3 to
Vitosolic 100
Check temperature sen-
sor % on solar control
module or Vitosolic sen-
sor
Check solar circuit pump
and solar circuit. Acknowl-
edge fault message.
Replace solar control
module or Vitosolic
Replace programming
unit
Check flue gas tempera-
ture sensor
97