Fault Codes - Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual

Troubleshooting

Fault codes

Dis- Const.
played
fault
code
0F
10 X
18 X
19 X
20 X
122
Weath.- System char-
comp. acteristics
Control mode
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
Service Service required
"0F" is only
displayed in Note
the fault histo- After servicing, se-
ry lect code "24:0".
Short circuit, Check outside tem-
outside tem- perature sensor
perature sen- (see page 139)
sor
Lead break, Check outside tem-
outside tem- perature sensor
perature sen- (see page 139)
sor
Communica- Check wireless
tion error, connection (place
wireless out- wireless outside
side tempera- temperature sen-
ture sensor sor close to the
wireless base sta-
tion). Log off out-
side temperature
sensor then log on
again. Replace if
required (see
"Wireless base sta-
tion" installation
and service in-
structions)
Short circuit, Check low loss
system flow header sensor (see
temperature page 140)
sensor