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Viessmann Vitodens 300 Service Instructions Manual page 92

Type wb3a, 49 and 66 kw gas fired wall mounted condensing boiler natural gas and lpg version
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Troubleshooting
Repairs
(cont.)
Checking the fuse
1. Switch OFF the mains power.
2. Release the lateral closures and
pivot the control unit down.
92
3. Remove cover A.
4. Check fuse F1.
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