Deleting The Fault Codes From The Fault Memory; Fault Codes - Viessmann Vitoligno 300-C Installation And Service Instructions For Contractors

Troubleshooting
Fault display
(cont.)

Deleting the fault codes from the fault memory

Press the following keys:
1. + simultaneously for approx. 4 s.
d
å
The "Service" menu appears.
2. / for "Fault history".
| ~
3. to confirm.
d

Fault codes

Fault code dis- System characteristics
played
20 Burner blocked
21 Return temperature raising
■
facility valve opening
Boiler circuit pump starts
■
22 Burner blocked
24 Control unit set to 0 °C out-
side temperature
25 No DHW heating
26 Control mode
27 Control mode
28 Control mode
29 Control mode
30 Burner blocked
31 Return temperature raising
■
facility valve opening
Boiler circuit pump starts
■
32 Burner blocked
34 Control unit set to 0 °C out-
side temperature
35 No DHW heating
36 Control mode
37 Control mode
38 Control mode
39 Control mode
70
4. / for "Delete".
| ~
5. / for "Yes".
| ~
6. to confirm.
d
7. until the default display is shown.
ä
Cause
Short circuit, boiler water
temperature sensor
Short circuit, boiler return
temperature sensor
Short circuit, flue gas tem-
perature sensor
Short circuit, outside tem-
perature sensor
Short circuit, top buffer
temperature sensor
Short circuit, buffer tem-
perature sensor 2
Short circuit, buffer tem-
perature sensor 3
Short circuit, buffer tem-
perature sensor 4
Short circuit, buffer tem-
perature sensor 5
Lead break, boiler flow
temperature sensor
Lead break, boiler return
temperature sensor
Lead break, flue gas tem-
perature sensor
Lead break, outside tem-
perature sensor
Lead break, buffer tem-
perature sensor 1 (top)
Lead break, buffer tem-
perature sensor 2
Lead break, buffer tem-
perature sensor 3
Lead break, buffer tem-
perature sensor 4
Lead break, buffer tem-
perature sensor 5
Measures
Check boiler water temperature
sensor.
Check boiler return temperature
sensor.
Check flue gas temperature sen-
sor.
Check outside temperature sensor.
Check top buffer temperature sen-
sor.
Check centre buffer temperature
sensor.
Check bottom buffer temperature
sensor.
Check bottom buffer temperature
sensor.
Check bottom buffer temperature
sensor.
Check boiler flow temperature sen-
sor.
Check boiler return temperature
sensor.
Check flue gas temperature sen-
sor.
Check outside temperature sensor.
Check buffer temperature sensor.
Check buffer temperature sensor.
Check buffer temperature sensor.
Check buffer temperature sensor.
Check buffer temperature sensor.