Viessmann VITOLIGNO 250-S Operating Instructions Manual page 37

Calling up fault messages
Calling up a fault message
Danger
Unresolved faults in the heating system repre-
sent a risk
■ If a fault occurs, shut the system down and
make it safe.
Contact your heating contractor immediately.
■
■ Rectify the fault immediately or have a heating
contractor rectify it if necessary.
■ When rectifying the fault, no-one else should
be present in the danger zone around the
heating system.
1. You can call up the cause of the fault with
Fault
Outside temp sensor
Fault O2 probe
Acknowledge with
Fig. 31
2. Pressing ? calls up information on the heating sys-
tem characteristics.
Also provided are tips on which measures you can
take yourself before notifying your heating contrac-
tor.
Calling up an acknowledged fault message
Press the following keys:
1. Repeatedly, until the standard menu is dis-
ä
played.
2. / For "Fault".
| ~
3. To confirm.
d
(cont.)
.
d
34
91
OK
3. Make a note of the cause of the fault and the fault
code shown next to it on the right. In this example:
"Outside sensor 34" and "Fault O2 probe 91".
This enables the heating contractor to be better pre-
pared for the service call and may save additional
travelling costs.
4. If you want to acknowledge the fault message, fol-
low the instructions in the menu.
The fault message is adopted into the menu.
Boiler water temp
Fault
Boiler
Buffer
Heating
Continue with
Fig. 32
Note
If you have connected signalling equipment to
■
indicate fault messages (e.g. a buzzer), this sig-
nalling equipment is deactivated when the fault
message is acknowledged.
■ If the fault can only be rectified at a later date, the
fault message is displayed again the next day and
the alarm equipment is switched on again.
Information call up
48°C
OK
37