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Viessmann Vitodens 300 Service Instructions Manual page 94

Type wb3a, 49 and 66 kw gas fired wall mounted condensing boiler natural gas and lpg version
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Troubleshooting
Repairs
(cont.)
Checking Vitotronic 050 (accessory)
Vitotronic 050 is connected with the control unit via the LON system. To test the
connection, implement a user check on the boiler control unit (see page 32).
94
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