Fault Codes - Viessmann VITODENS 200-W Installation And Service Instructions Manual

Troubleshooting

Fault codes

Dis- Const.
played
fault
code
10 X
18 X
19 X
20 X
112
Weath.- System char-
comp. acteristics
X Controls as if
the outside
temperature
were 0 °C
X Controls as if
the outside
temperature
were 0 °C
X Controls as if
the outside
temperature
were 0 °C
X Regulates with-
out flow tem-
perature sen-
sor (low loss
header)
Cause Measures
Short circuit, Check outside tem-
outside tem- perature sensor
perature sen- (see page 129)
sor
Lead break, Check outside tem-
outside tem- perature sensor
perature sen- (see page 129)
sor
Communica- Check wireless
tion interrup- connection (place
tion with wire- wireless outside
less outside temperature sen-
temperature sor close to the
sensor wireless base sta-
tion).
Log off outside
temperature sen-
sor then log on
again.
Replace wireless
outside tempera-
ture sensor.
Short circuit, Check low loss
flow tempera- header sensor (see
ture sensor page 130)
Wireless
base sta-
tion installa-
tion and
service in-
structions