Fault Codes - Viessmann VITODENS 200-W Service Instructions Manual

Troubleshooting

Fault codes

Dis- Const.
played
fault
code
10 X
18 X
20 X
28 X
30 X
38 X
40
44
92
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 Regulates with-
out flow tem-
perature sen-
sor (low loss
header)
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
Cause Measures
Short circuit, Check outside tem-
outside tem- perature sensor
perature sen- (see page 106)
sor
Lead break, Check outside tem-
outside tem- perature sensor
perature sen- (see page 106)
sor
Short circuit, Check low loss
system flow header sensor (see
temperature page 107)
sensor
Lead break, Check low loss
system flow header sensor (see
temperature page 107)
sensor
Check boiler water
boiler water temperature sen-
temperature sor (see
sensor page 107)
Check boiler water
boiler water temperature sen-
temperature sor (see
sensor page 107)
Short circuit, Check the flow
flow tempera- temperature sen-
ture sensor, sor (see
heating circuit page 111)
2 (with mixer)
Short circuit, Check the flow
flow tempera- temperature sen-
ture sensor, sor (see
heating circuit page 111)
3 (with mixer)