Replacing The Flow Rate Sensor - Viessmann Vitodens 200-W B2HA 112 Installation Instructions Manual

Troubleshooting
Vitodens 200-W B2HA 112, 150, 399, 530 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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