Viessmann VITOTRONIC 300 Installation And Service Instructions Manual page 50

Downloading fault codes from the fault memory (fault history)
1
F 1
1
.
.
.
F 1 0
1
50
18
18
d4
1. G
2.
a b
Order of fault
codes occurred
1
. .
.
10
e
3. d
d
Fault code
. .
.