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Viessmann Vitocrossal 300 Service Instructions For Contractors page 112

Gas condensing boiler with matrix gas burner and lambda pro control, natural gas and lpg version open and balanced flue operation
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Troubleshooting
Repairs
(cont.)
3. Refit the casing cover.
Checking the Vitotronic 200-H (accessories)
The Vitotronic 200-H is connected to the
control unit via the LON cable. To test the
connection, carry out a subscriber check
at the boiler control unit (see page 53).
112
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