Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 151

Diagnosis (service scans)
Note
Only connected temperature sensors
are displayed. In case of faults, the dis-
play shows "- - -".
System overview
Service menu:
1. Press OK + å simultaneously for
approx. 4 s.
2. "Diagnosis"
3. "System overview"
A B C D E F G H K
System overview
Ü
1 2
50
0
1
3 45
7 41 42 29
51 52
45
O
Back with
A to L For an explanation of the con-
tents of columns A to L,
see the following tables.
(cont.)
Note
The display depends on the system ver-
sion (e.g. column H: display only if
heating circuit M2 is installed).
With some components the symbols
move when they are operational (e.g.
pumps).
The values shown are examples.
1 2 3
è è è
50 45 21 22 23
33 21 22 23 18
44 32 33
45 38 38 38
ä
N
O
Troubleshooting
L
Ç
20
15
10
N
Cooling function:
■ "natural cooling":
■ "active cooling":
The arrow points at the heat-
ing/cooling circuit activated
for cooling.
Geothermal probe symbol
151