Checking The Fuse/Mcb; Checking The Solar Control Module Fuse; Mixer Extension Kit - Viessmann Vitodens 242-F Installation And Service Instructions Manual

Maintenance
(cont.)

Checking the fuse/MCB

A
Fig. 78
1. Switch off the power supply.
2. Release the side closures and pivot the control unit
down.

Checking the solar control module fuse

A
Fig. 79
1. Switch off the power supply.

Mixer extension kit

Checking the setting of rotary selector S1
The rotary selector on the PCB of the extension kit
defines the assignment to the relevant heating circuit.
F1
3. Remove cover .
A
4. Check fuse F1 (see connection and wiring dia-
gram).
2. Check fuse
A in the solar control module (see con-
nection and wiring diagram).
Troubleshooting
109