Checking The Fuse - Viessmann B1HF Installation And Service Instructions Manual

Troubleshooting
Repairs
(cont.)

Checking the fuse

F1
2.
Fig. 50
1. Switch ON/OFF switch
2. Remove the programming unit.
3. Pivot the HBMU heat management unit down.
4. Remove cover
A .
92
4.
3.
A
B
OFF.
B
1.
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.