Viessmann VITODENS 100-W Installation And Service Instructions Manual page 33

Fault messages on the display
Displayed System characteris-
fault code tics
10 Constant mode
18 Constant mode
30 Burner blocked
38 Burner blocked
50 No DHW heating
58 No DHW heating
60 Burner blocked
68 Burner blocked
A9 Control mode without
Open Therm device
b0 Burner blocked
b8 Burner blocked
E5 Burner blocked
F0 Burner blocked
(cont.)
Cause
Short circuit, out-
side temperature
sensor
Lead break, out-
side temperature
sensor
Short circuit, boiler
water temperature
sensor
Lead break, boiler
water temperature
sensor
Terminal box cylin-
der demand fault
Terminal box cylin-
der demand fault
Short circuit, return
temperature sen-
sor
Lead break, return
temperature sen-
sor
Communication er-
ror Open Therm
device
Short circuit, flue
gas temperature
sensor
Lead break, flue
gas temperature
sensor
Internal fault
Internal fault
Troubleshooting
Measures
Check the outside tem-
perature sensor and lead
(see page 38).
Check the outside tem-
perature sensor and lead
(see page 38).
Check the boiler water
temperature sensor (see
page 39).
Check the boiler water
temperature sensor (see
page 39).
Check terminal box con-
nections and replace the
terminal box if required.
Check terminal box con-
nections and replace the
terminal box if required.
Check the return temper-
ature sensor (see
page 39).
Check the return temper-
ature sensor (see
page 39).
Check connections and
cable; replace Open
Therm device if required.
Check the sensor (see
page 41).
Check the sensor (see
page 41).
Check the ionisation elec-
trode and connecting ca-
bles.
Press "Reset" (see
page 36).
Replace control unit.
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