Fault Codes - Viessmann VITODENS 200-W Service Instructions Manual

Fault display
(cont.)
4. d
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Fault codes

Fault Const.
code on
the dis-
play
0F X
10
18
20
28
30 X
38 X
weath.- System char-
comp. acteristics
X Control mode
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 Boiler water
Troubleshooting
Cause Measures
Maintenance Service the equip-
ment. After the
service, set coding
address "24:0"
Short circuit, Check the outside
outside tem- temperature sen-
perature sen- sor (see
sor page 83)
Break, out- Check the outside
side tempera- temperature sen-
ture sensor sor (see
page 83)
Short circuit - Check the low loss
system flow header sensor (see
temperature page 85)
sensor
Break, sys- Check the low loss
tem flow tem- header sensor (see
perature sen- page 85)
sor
Check the boiler
boiler water water temperature
temperature sensor (see
sensor page 85)
Check the boiler
temperature water temperature
sensor lead sensor (see
broken page 85)
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