Fault Codes - Viessmann VITODENS 200-W Service Instructions Manual

Troubleshooting
Fault display
(cont.)
4. d Scanning is completed.

Fault codes

Fault Const. Weath.-
code on comp.
the dis-
play
0F X X
10 X
18 X
20 X
28 X
30 X X
38 X X
66
System char- Cause
acteristics
Control mode Service
Controls as if Short circuit,
the outside outside tem-
temperature perature sen-
were 0 °C sor
Controls 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
Measures
Service the appli-
ance. After servic-
ing, set coding
address "24:0"
Check the outside
temperature sen-
sor (see
page 76).
Check the outside
temperature sen-
sor (see
page 76).
Check the low loss
header sensor (see
page 78).
Check the low loss
header sensor (see
page 78).
Check the boiler
water temperature
sensor (see
page 78).
Check the boiler
water temperature
sensor (see
page 78).