Viessmann VITODENS 100-W Installation And Service Instructions Manual page 77

Gas fired wall mounted condensing boiler natural gas version type wb1a

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Repairs

(cont.)

7. Check the primary side for contami-

nation and, if necessary, clean or

replace the plate heat exchanger.

Checking the fuse

1. Switch OFF the mains power.

2. Flip down control unit.

3. Remove cover A.

8. Install in reverse order using new

gaskets.

Note

Ensure that fixing holes and seals

are aligned. Install the heat plate

exchanger the correct way round.

4. Check fuse F1.

Troubleshooting

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