Viessmann VITODENS 200-W Service Instructions Manual page 82

Troubleshooting
Vitodens 200-W B2HA 112, 150 Service
Corrective Action
(continued)
Replacing the flow rate sensor
Note: In the event of a fault, both sensors need to be
replaced.
1. Drain the boiler on the heating water side.
2. Pull leads from flow rate sensor A.
3. Undo screws and remove faulty flow rate sensor A.
4. Install new flow rate sensor A and secure with the
screws.
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