Viessmann WB1A007 - Page 67

Troubleshooting
67
Correction (continued)
Check fuses
Power pump module fuse
1. Switch off main power supply.
2. Flip down and remove control unit
.
3. Remove power pump module cover
plate .
4. Check fuse F1 T6.3A (slow blow).
Replacements available form
Viessmann - package of 10
(PN 7815 580).
Control unit fuse
1. Switch off main power supply.
2. Flip down control unit.
3. Remove cover .
4. Check fuse F1 T4.0A (slow blow).
Replacements available form
Viessmann - package of 10
(PN 7404 364).
5581 775 1.3
¾”/20mm
¼”/5mm
Fuse F1 T6.3A
A
F1 T4.0A