Viessmann Vitocal 350-A Installation And Service Instructions Manual page 132

Troubleshooting
Control unit diagnostics
Displaying and acknowledging mes-
sages
■ 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 selec-
ted operating mode (e.g. standard
mode) by the instantaneous heating
water heater (with a correspondingly
high power consumption). We
therefore recommend only using this
function to bridge a short period.
Press the following keys:
1. To log on as "Contractor", see
page 168.
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.
Press the following keys:
1. To log on as "Contractor", see
page 168.
2. "Information".
3. "Statistics".
132
(cont.)
2. "Information".
3. "Fault messages".
4. "TIME"
5. "MESSAG" to return to the mes-
6. "ALL"
4. "Message history".
5. "TIME"
6. "MESSAG" to return to the mes-
Note
Ó Time information relates to the time
at which the message occurred.
Ò Time information relates to the time
at which the message was deleted or
the fault was remedied.
for the times at which
the messages occur-
red.
sage display.
to acknowledge all
messages.
for the times at which
the messages occur-
red.
sage display.