Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 128

Fault rectification
Fault display
(cont.)
Deleting saved fault codes from the fault memory
Press the following keys:
1. + Simultaneously for approx. 4 seconds.
d
å
The "Service" menu appears.
2. / For "Fault history".
| ~
3. To confirm.
d
Fault displays in plain text
The following faults are displayed as plain text.
Fault codes
Fault code dis- System characteristics
played
0A Control of system circuits not
possible
10 Burner blocked
11 Burner blocked
12 Burner blocked
20 Burner blocked
21 Return temperature raising
■
facility valve opens.
Boiler circuit pump starts.
■
22 Burner blocked
23 Burner blocked
*7
This fault is only generated when a wideband probe including a separate PCB are being used.
*7
128
4. / To "Delete".
| ~
5. To confirm.
d
6. / For "Yes".
| ~
7. To confirm.
d
8. Until the default display is shown.
ä
The meaning of the fault and the fault code shown to
the right are detailed in the table below.
Cause
No connection to heating
circuit PCB (HKK)
No connection to the aux-
iliary PCB (ZPK)
No connection to auxiliary
PCB (ZPK)
No connection to the aux-
iliary PCB (ZPK)
Short circuit, boiler water
temperature sensor
Short circuit, boiler return
temperature sensor
Short circuit, flue gas tem-
perature sensor
Lambda probe fault
Measures
Check connection between boiler
■
PCB and heating circuit PCB.
Notify heating contractor.
■
Check the type of the auxiliary
■
PCB.
Check connection between boiler
■
PCB, heating circuit PCB and
auxiliary PCB.
Notify heating contractor.
■
Check the type of the auxiliary
■
PCB.
Check connection between boiler
■
PCB, heating circuit PCB and
auxiliary PCB.
Notify heating contractor.
■
Check the type of the auxiliary
■
PCB.
Check connection between boiler
■
PCB, heating circuit PCB and
auxiliary PCB.
Notify heating contractor.
■
Check boiler water temperature
sensor.
Check the boiler return tempera-
ture sensor.
Check flue gas temperature sen-
sor.
Clean the Lambda probe. Recali-
■
brate.
Notify heating contractor.
■