Viessmann Vitocrossal 200 Series Service Instructions Manual page 35

Burner control unit VUC 310
Display and programming unit
The burner control unit includes a display and pro-
gramming unit, as well as the burner coding card. The
display screen shows the relevant operating status, the
service and parameter status, as well as any fault or
error messages. The buttons allow you to change set-
tings in the various control levels.
Status Service
S
Fig. 33
Reset button
A
Operating and fault indications:
B
Heat demand
Burner operation
Service
Fault
C Select button
Cursor buttons
D
Operating display
In standard mode, the status indicator shows the cur-
rent operating status. The same applies in a fault state
after pressing reset button R.
Display
Status Service
Fig. 34 Example
Status
0
0
0
0
0
0
0
0
0
R
Service
A
0
1
2
P
3
4
5
6
Note
Depending on the system configuration, the display
and control functions can in part also be carried out on
the boiler control unit.
Control unit installation and service instructions,
operating instructions
The following displays are shown automatically. If a
fault occurs, see the fault codes on page 41
onwards. You can exit at any time by pressing reset
button R (hold down for 0.5 to 10 s).
Meaning
System start-up after power supply "ON"
Standby
System tests, idle state check
Fan ramp-up
Valve and/or relay check
Pre-purge
Pre-ignition
Ignition, flame formation safety time
Flame stabilisation
Burner control unit
35