Fault Display - Viessmann Vitodens 050-W BP JD Installation And Service Instructions Manual

Troubleshooting
Function sequence and possible faults
Yes
Burner in opera-
tion

Fault display

Example
Displayed System characteris-
fault code tics
10 Constant mode
18 Constant mode
30 Burner blocked
38 Burner blocked
51 No DHW heating
48
No
Stops below the set
boiler water tem-
perature and re-
starts immediately
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
Short circuit, outlet
temperature sen-
sor
(cont.)
Display
■ Faults with lower priority:
Fault code (e.g. "51") is displayed per-
manently and fault symbol " " flashes
■ Faults with higher priority:
Fault code (e.g. "F2") flashes and fault
symbol " " flashes
For an explanation of the fault codes,
see the following table.
Measures
Check the outside tem-
perature sensor and lead
(see page 54).
Check the outside tem-
perature sensor and lead
(see page 54).
Check boiler water tem-
perature sensor (see
page 55).
Check boiler water tem-
perature sensor (see
page 55).
Check sensor (see
page 57).
Check the flue sys-
tem for tightness
(flue gas recircula-
tion); check the
gas flow pressure