Viessmann B1HE-199 - Opening the Junction Box

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Vitodens 100-W, B1HE/B1KE Combi Installation/Service
Fault Messages
(continued)
Troubleshooting / Function Description
Fault Messages
(continued)
Repairs
(continued)
Checking the fuse
1. Turn off the ON/OFF switch.
2. Depending on the configuration: Move programming
unit together with bracket to maintenance position.
3. Remove cover A.
4. Check fuse F1 (see connection and wiring diagram).
WARNING
Incorrect or improperly fitted fuses can lead to an
increased risk of fire.
 Insert fuses without using any force. Position fuses
correctly.
 Only use structurally identical types with the
specified response characteristics.
Fault Messages
(continued)
Fault Messages
(continued)
Opening the Junction Box
1. Folding down the red clips to open the front cover
of the junction box.
2. Open the front cover by a turning movement.
3. Push the side clips to the side to unlock the rear
cover.
4. Now the rear cover is unlocked and can be turned out
upwards and opened