Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 123

Fault codes
(cont.)
Dis- Const.
played
fault
code
28 X
30 X
38 X
40
44
48
4C
Weath.- System char-
comp. acteristics
X Regulates with-
out flow tem-
perature sen-
sor (low loss
header)
X Burner blocked Short circuit,
X Burner blocked Lead break,
X Mixer closes
X Mixer closes
X Mixer closes
X Mixer closes
Troubleshooting
Cause Measures
Lead break, Check low loss
system flow header sensor (see
temperature page 140)
sensor If no low loss head-
er sensor is con-
nected, set code
52:0
Check the boiler
boiler water water temperature
temperature sensor (see
sensor page 140)
Check the boiler
boiler water water temperature
temperature sensor (see
sensor page 140)
Short circuit, Check flow temper-
flow tempera- ature sensor (see
ture sensor, page 148)
heating circuit
2 (with mixer)
Short circuit, Check flow temper-
flow tempera- ature sensor (see
ture sensor, page 148)
heating circuit
3 (with mixer)
Lead break, Check flow temper-
flow tempera- ature sensor (see
ture sensor, page 148)
heating circuit
2 (with mixer)
Lead break, Check flow temper-
flow tempera- ature sensor (see
ture sensor, page 148)
heating circuit
3 (with mixer)
123