Viessmann Vitoplus 300 Service Instructions Manual page 84

Troubleshooting
Repairs
(cont.)
Switch position I for central heating
return from the left (delivered condi-
tion).
Checking the Vitotronic 050 (accessories)
The Vitotronic 050 is connected to the control unit via the LON system. To test
the connection, implement a user check at the boiler control unit (see page 31).
84
Switch position II for central heating
return from the right.