Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 126

Troubleshooting
Messages
Scanning messages
Note
When opening up the heat pump control unit, the top part of the control unit clicks
into a specific position. You can change this position by pushing C on the side.
A ON indicator (green)
B Fault indicator (red)
C Button to change the end-stop posi-
tion
If messages are pending, the message
symbol flashes in the display ( ,
For faults ( ), fault indicator B also
flashes.
Show the message text and message
code by pressing OK (see "Message
overview").
126
D
C
B A
D Top part of the control unit with inte-
gral programming unit
Note
, ).
Outside temp sensor
Power-OFF
Acknowledge with
i
(
OK
18
C5