Viessmann Vitotronic 200 Installation And Service Instructions Manual page 58

Troubleshooting
Faults that are displayed at the programming unit
Fault codes
Fault code System character-
on the dis- istics
play
0F Control mode
10 Regulates as if the
outside temperature
was 0 °C
18 Regulates as if the
outside temperature
was 0 °C
30 The burner is
started and stopped
via a thermostat
38 The burner is
started and stopped
via a thermostat
50 Cylinder primary
pump "ON":
Set DHW tempera-
ture = Set boiler
water temperature
Priority control is
cancelled or
With cylinder pri-
mary system:
Cylinder heating is
started and stopped
by cylinder tem-
perature sensor 2
51 With cylinder pri-
mary system:
Cylinder heating is
started and stopped
by cylinder tem-
perature sensor 1
58
Cause Measures
Service Service the equipment.
"0F" is only dis- After the service, set
played in the fault coding address "24:0".
history
Outside tempera- Check the outside tem-
ture sensor perature sensor (see
shorted out page 111)
Outside tempera- Check the outside tem-
ture sensor lead perature sensor (see
broken page 111)
Boiler water tem- Check the boiler water
perature sensor temperature sensor (see
shorted out page 109)
Boiler water tem- Check the boiler water
perature sensor temperature sensor (see
lead broken page 109)
Cylinder tempera- Check the cylinder tem-
ture sensor 1 perature sensor (see
shorted out page 109)
Cylinder tempera- Check the cylinder tem-
ture sensor 2 perature sensor (see
shorted out page 109)
(cont.)