Viessmann Vitotronic 200 KW2 Installation And Service Instructions Manual page 38

Troubleshooting
Faults which are displayed at the programming unit
Fault
System
code
characteristics
Cylinder primary
50
pump ON:
Set cylinder
temperature = set temperature = set
58
boiler temperature,
priority control is
cancelled
Control mode
92
Only solar control
unit fault codes will
be displayed p y
93
94
9a
9b
9c
38
Cause
Short circuit
Cylinder temperature
sensor
Lead broken
Cylinder temperature
sensor
Short circuit
Collector temperature
sensor, connects to
Vitosolic S1
Short circuit
Cylinder temperature
sensor, connects to
Vitosolic S2
Short circuit
Temperature sensor,
connects to Vitosolic
S3
Lead broken
Collector temperature
sensor, connects to
Vitosolic S1
Lead broken
Cylinder temperature
sensor, connects to
Vitosolic S2
Lead broken
Temperature sensor,
connects to Vitosolic
S3
(cont.)
Remedy
Check cylinder
temperature sensor
(see page 59)
Check solar control
unit sensor