Viessmann VITOCAL 300 Installation And Service Instructions Manual page 46

Commissioning, inspection, maintenance
Further details regarding the individual steps
46
(cont.)
2. If the adjacent display appears:
Continue with point 4.
3. If the adjacent display appears
(fault messages present):
Press the key marked in the dia-
gram.
4. & Press the following keys one after
the other:
"v", "O" and "º".
& Enter the code for heating con-
tractors ("SERVICE"; for details
see page 76).
& Press the following keys one after
the other:
"Y" and "¼".