Viessmann VITODENS 100-W Installation And Service Instructions Manual page 75

Gas fired wall mounted condensing boiler natural gas version type wb1a

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Repairs

(cont.)

Replacing flow limiter

1. Switch OFF the mains power.

2. Close the gas shut-off valve and

safeguard against reopening.

3. Drain the boiler from the secondary

side.

4. Pivot the control unit downwards.

5. Release the ties A and screwsB.

6. Remove the flow switch C connec-

tor.

7. Replace flow limiter D.

8. Refit the flow switch C connector.

Troubleshooting

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