Viessmann VITOLIGNO 300-P Service Instructions Manual page 82

Service scans
Temperatures, boiler coding card and brief scans
Display
"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, grate cleaning motor
B Limit switch, secondary air
C Limit switch, primary air
D —
E —
F Door contact switch
G External safety equipment
H Status high limit safety cut-out
82
Explanation
See page 84
See page 84
Status
0
No feedback
No feedback
No feedback
—
—
Door open
Safety chain
interrupted
High limit safety
cut-out has
responded
(cont.)
1
Feedback ena-
bled (only
briefly)
Feedback ena-
bled (only
briefly)
Feedback ena-
bled (only
briefly)
—
—
Door closed
Safety chain not
interrupted
High limit safety
cut-out not
responded