Fault Messages On The Display - Viessmann Vitodens 100-W Installation And Service Instructions Manual

Function sequence and possible faults
yes
no
Burner in opera-
tion

Fault messages on the display

f
Fault code System characteris-
on the dis- tics
play
10 Constant mode
18 Constant mode
30 Burner blocked
38 Burner blocked
50 No DHW heating
Stops below the set
boiler water tem-
perature and
restarts immedi-
ately
Faults are indicated by a flashing fault
code with fault symbol "U" on the dis-
2
play.
For fault code explanations see the fol-
lowing table.
Cause
Short circuit, out-
side temperature
sensor
Break, outside
temperature sen-
sor
Short circuit, boiler
water temperature
sensor
Break, boiler water
temperature sen-
sor
Cylinder tempera-
ture sensor shor-
ted out
Troubleshooting
(cont.)
Check the flue gas
system for tight-
ness (flue gas
recirculation),
check the gas flow
pressure
Measures
Check the outside tem-
perature sensor and lead
(see page 37).
Check the outside tem-
perature sensor and lead
(see page 37).
Check the boiler water
temperature sensor (see
page 39).
Check the boiler water
temperature sensor (see
page 39).
Check the sensor (see
page 40).
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