Boiler Control - Viessmann VITOLIG 300 Service Instructions Manual

8. Boiler control

1. Remove lid A and flip up control
unit cover B.
2. Undo screws and remove lid C.
3. Undo screw and flip up control unit
top D.
4. If required, clean the PCB with
compressed air or a vacuum clea-
ner.
Inspection and maintenance
5. Check the electrical plug-in con-
nections for tight fit.
6. Check the routing of electrical
cables/leads. These must neither
touch hot components (e.g. fan
box) nor be squashed in.
7. Close control unit again.
17