Viessmann VITOCAL 300-A Installation And Service Instructions Manual page 117

Control unit diagnostics
Note
& Message on the display, e.g. "¸C5
power-OFF"
Message symbol "¸" flashes
& The display of information is subject
to access rights (enter access code
for contractors).
& The appliance retains its functional-
ity, however the information needs
to be noted.
Displaying and acknowledging messages
& The message will be redisplayed at
07:00 h the following day if the fault
has not been rectified.
& The red fault indicator flashes until
the fault has been rectified.
& If the message "«A9: Heat pump"
is acknowledged, the system will be
heated in accordance with the
selected operating mode (e.g. stan-
dard mode) by the electric heater
(with a correspondingly high power
consumption). Therefore, use this
function only to bridge a short per-
iod.
Press the following keys:
1. To log on as "Contractor", see
page 131.
Recalling acknowledged messages
& The messages cannot be acknowl-
edged in the message history.
& The messages are listed in order of
occurrence with the most recent
first.
& Up to 30 entries are stored.
(cont.)
2. "Information".
3. "Fault messages".
4. "TIME"
5. "MESSAG" to return to the mes-
6. "ALL"
Press the following keys:
1. To log on as "Contractor", see
page 131.
2. "Information".
3. "Statistics".
Troubleshooting
for the times at which
the messages
occurred.
sage display.
to acknowledge all
messages.
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