Viessmann VITODENS 111-W Installation And Service Instructions Manual page 50

Troubleshooting
Repairs
(cont.)
3. Check fuse F4.
Danger
Incorrect or improperly fitted fuses can lead
to an increased risk of fire.
Insert fuses without using any force. Posi-
■
tion fuses correctly.
Only use structurally identical types with
■
the specified response characteristics.
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