Check Fuses - Viessmann WB1A Series Installation And Service Instructions Manual

Correction
(continued)
Fuse F1 T6.3A
¾"/20mm
A
F1 T4.0A
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Check fuses

¼"/5mm
Troubleshooting
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).
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