Viessmann VITODENS 222-F Installation And Service Instructions Manual page 124

Troubleshooting
Repairs
(cont.)
Checking the fuse
1. Switch OFF the power.
2. Release the side closures and pivot
the control unit down.
Extension kit for heating circuit with mixer
Checking the setting of rotary selec-
tor S1
The rotary selector on the PCB of the
extension kit defines the assignment to
the relevant heating circuit.
124
F1
3. Remove cover A.
4. Check fuse F1 (see connection and
wiring diagram).
Heating circuit
Heating circuit with
mixer M2 (heating cir-
cuit 2)
Heating circuit with
mixer M3 (heating cir-
cuit 3)
Rotary
selector S1
setting
2
4