Check Fuses - Viessmann VITODENS 100-W WB1B Series Installation And Service Instructions Manual

Correction
(continued)

Check fuses

Start-up and Maintenance
Fuse
Fig. 75
Start-up and Maintenance
Fig. 76
Troubleshooting
Power pump module fuse
1. Switch off main power supply.
2. Flip down and remove control unit
A. Also refer to pages 37 and
38.
3. Remove power pump module
cover plate B.
4. Check fuse F1 T6.3A (slow blow).
Replacements fuses are available
from Viessmann in packs of 10
(Part No. 7815 580).
Control unit fuse
1. Switch off main power supply.
2. Flip down control unit.
3. Remove cover A.
4. Check fuse F4 T 2.5A (slow
blow). Replacements fuses are
available from Viessmann in packs
of 10 (Part No. 7404 396).
IMPORTANT
The ON / OFF switch located on the
boiler does not disconnect power to
power / pump module, therefore the
main service switch or breaker must
be turned off.
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