Viessmann Vitoligno 300-P Service Instructions For Contractors page 72

Service scans
Temperatures, boiler coding card and brief...
Display
"Status digital outputs 1"
"Status digital outputs 2"
"Brief scan 1"
to
"Brief scan 7"
Digital inputs
Diagnosis
Status dig. ...
0 0 0 0 0 0 0 0
A B C D E F G H
Digital inputs 1
Position
A
Feedback, deslagging drive
B Limit switch, secondary air
C Limit switch, primary air
D —
E —
F Door contact switch
G External safety device
H
Status high limit safety cut-out
72
Explanation
See page 73
See page 74
See page 74
Status
0
No feedback
No feedback
No feedback
—
—
Door open
Safety chain
broken
High limit safety
cut-out activa-
ted
(cont.)
1
Feedback ena-
bled (only
briefly)
Feedback ena-
bled (only
briefly)
Feedback ena-
bled (only
briefly)
—
—
Door closed
Safety chain bro-
ken
High limit safety
cut-out not
responded