Viessmann VITOLIGNO 300-C Operating Instructions Manual page 11

Action in case of the boiler overheating
A
Fig.5
1. Slide cover on the programming unit to the right.
A
2. Press the green button on the high limit safety cut-
out. A quiet "click" will be audible. The high limit
safety cut-out has been reset.
3. Close the programming unit cover.
4. Acknowledge the excess temperature on the pro-
gramming unit of the control unit with
(cont.)
.
d
Boiler operation
11