Viessmann VITOTRONIC 100 Installation And Service Instructions Manual page 115

Faults which are displayed at the programming unit
Fault
System
code
characteristics
Control mode
92
Only solar control
unit fault codes will
be displayed
93
94
9a
9b
9c
9f
Cause
Short circuit
Collector
temperature sensor,
connects to S1
(Vitosolic)
Short circuit
Cylinder
temperature sensor,
connects to S2
(Vitosolic)
Short circuit
Temperature sensor,
connects to S3
(Vitosolic)
Lead broken
Collector
temperature sensor,
connects to S1
(Vitosolic)
Lead broken
Cylinder
temperature sensor,
connects to S2
(Vitosolic)
Lead broken
Temperature sensor,
connects to S3
(Vitosolic)
Error
Solar control unit;
displayed if an error
without fault code
occurs at solar
control unit
Troubleshooting
(cont.)
Remedy
Check solar control
unit sensor
Check solar control
unit
115