Viessmann Vitotronic 200 KW2 Installation And Service Instructions Manual page 37

Faults which are displayed at the programming unit
Fault
System
code
characteristics
Control mode
0f
Activates after 0ºC
10
outside temperature
18
Mixer closes
20
Control without
21
return temperature
influence
Mixer closes
28
Control without
29
return temperature
influence
H with DHW cylinder:
30
Cylinder primary
pump ON; boiler
will be held at set
DHW cylinder
temperature temperature
38
H without DHW
cylinder:
Boiler is regulated
by control
thermostat
Cause
Maintenance
0F is only displayed
in the fault history
Short circuit
Outside temperature
sensor
Lead broken
Outside temperature
sensor
Short circuit
Flow temperature
sensor
Short circuit
Return temperature
sensor
Lead broken
Flow temperature
sensor
Lead broken
Return temperature
sensor
Short circuit
Boiler temperature
sensor
Lead broken
Boiler temperature
sensor
Troubleshooting
(cont.)
Remedy
Carry out
maintenance
Note
Set code 24:0 after
maintenance.
Check outside
temperature sensor
( (see page 60) p g )
Check flow
temperature sensor
(see page 63)
Check return
temperature sensor
(see page 63)
Check flow
temperature sensor
(see page 63)
Check return
temperature sensor
(see page 63)
Check boiler
temperature sensor
(see page 59)
37