Viessmann VITOLIGNO 300-C Operating Instructions For The System User page 42

Shutdown
Shutting down the heating system for an extended period
You can switch your heating system off if you do not
intend to use it. We recommend you contact your heat-
ing contractor before and after shutting down for longer
periods.
Your heating contractor can then take suitable steps
such as frost protection for the system or heating sur-
face preservation as required.
Shutdown
1. Note
Only disconnect the mains plug of the boiler for
maintenance and repair purposes.
Otherwise the lambda probe will not be heated.
■
This can cause damage to the lambda probe dur-
ing longer shutdown periods.
■ The boiler circuit pump is switched on briefly at
regular intervals.
2. Complete the work in accordance with the "mainte-
nance intervals" table on page 46.
3. If there is a risk of frost, drain the boiler. Observe
the instructions provided by your heating contrac-
tor. Alternatively, you could ask them to add anti-
freeze.
42
Note
No special measures are required when shutting down
the system on a temporary basis.