Viessmann VITOTRONIC 100 GC1 Installation And Service Instructions Manual page 85

Steps
1. Controls and indicators
Override switch
Boiler water temperature
(without function on multi-boiler
systems)
Domestic hot water temperature
(without function on multi-boiler
systems)
Value selection buttons
Information
Confirmation
Basic setting
Display window
Heating program selector buttons
(w without function on multi-boiler
systems)
Adjustable high limit
Fixed high limit reset button
F1 T6,3 A
TUV
F2 T6,3 A
Control on/off switch
Fuses
TUV button
Operating status indicator (green)
Fault indicator (red)
Start-up
85