Fault Codes - Viessmann VITODENS 222-F Installation And Service Instructions Manual

Troubleshooting

Fault codes

Dis- Const. Weath.-
played comp.
fault
code
10 X X
18 X X
20 X X
28 X X
30 X X
38 X X
40 X
44 X
104
System char- Cause
acteristics
Regulates as if Short circuit,
the outside outside tem-
temperature perature sen-
were 0 °C sor
Regulates as if Lead break,
the outside outside tem-
temperature perature sen-
were 0 °C sor
Regulates with- Short circuit,
out flow tem- system flow
perature sen- temperature
sor (low loss sensor
header)
Regulates with- Lead break,
out flow tem- system flow
perature sen- temperature
sor (low loss sensor
header)
Burner blocked Short circuit,
boiler water
temperature
sensor
Burner blocked Lead break,
boiler water
temperature
sensor
Mixer closes Short circuit,
flow tempera-
ture sensor,
heating circuit
2 (with mixer)
Mixer closes Short circuit,
flow tempera-
ture sensor,
heating circuit
3 (with mixer)
Measures
Check the outside
temperature sen-
sor (see
page 116)
Check the outside
temperature sen-
sor (see
page 116)
Check the low loss
header sensor (see
page 118)
Check the low loss
header sensor (see
page 118)
Check the boiler
water temperature
sensor (see
page 118)
Check the boiler
water temperature
sensor (see
page 118)
Check flow temper-
ature sensor
Check flow temper-
ature sensor