27
Status Service
S
A
B
C
Fig. 24
A
Reset button
B
LED: left
–
heat demand; centre
–
flame; right
–
fault
C
Selection button
The display screen comprises three digits consisting of
seven segments each. 4 keys serve to make adjust-
ments at the different operating levels.
Operating display
In standard mode, the status indicator shows the cur-
rent operating status. The same applies after pressing
reset following a fault.
The following displays are shown automatically. If a
fault occurs, see the fault codes on page 32
onwards. You can exit at any time by pressing reset
button
A
(hold for 5 to 10 s).
Status Service
Fig. 25
Standby
Status Service
Fig. 26
Start
Heat demand
System tests
Status Service
Fig. 27
Idle state check
Fan ramp-up
Status Service
Fig. 28
Valve check
Status Service
Fig. 29
Pre-purge
Status Service
Fig. 30
Pre-ignition
Burner control unit
(cont.)
5783 337 GB
Diagnosis
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