Checking The Fuse - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Repairs
(cont.)

Checking the fuse

F1
Fig. 48
1. Turn off the ON/OFF switch.
2. Depending on the layout: Move programming unit
together with bracket to service position.
3. Pivot the HBMU heat management unit down.
4. Remove cover .
A
A
5. Check fuse F1 (see connection and wiring dia-
gram).
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.
Troubleshooting
101