Viessmann VITOCAL 300, Installation And Service Instructions Manual

Page: 57 / 160

Programming unit overview
A
Display
B
Rotary selector "Reduced room
temperature"
C
Rotary selector "Standard room
temperature"
D
Operating mode selector
E
Menu keys
F
Programming unit flap
Fault messages
Internal faults are captured, displayed
and saved by the device.
If there are current faults, and the flap
of the programming unit is closed, the
fault symbol "
U
" flashes on the control
unit display.
A maximum of 8 faults can be stored.
&
Messages with lower priority will be
deleted if there are messages with
higher priority (than those already
stored).
&
In case of messages with the same
priority (as those already stored),
older messages will be deleted.
&
Messages with lower priority (than
those already stored) will not be
stored.
Active faults are displayed in accor-
dance with their respective priority.
Control unit diagnostics
57
Troubleshooting
55
92
901
GB
Service