Troubleshooting Control Unit Diagnostics - Viessmann VITOCAL 300-A Installation And Service Instructions Manual

Troubleshooting
Control unit diagnostics
Messages
Messages are grouped, displayed
and saved in 3 categories (see from
page 116):
1. Fault (highest priority)
2. Warning (medium priority)
3. Note (lowest priority)
Fault
Standard display: The fault symbol
"U" flashes on the l.h. side at the
bottom of the display (display area
for current operating states).
The central fault message terminal
(2X7.12/2X7.13) is activated.
The red LED (indicator) adjacent to
the programming unit flashes.
Warning
Standard display: The warning sym-
bol "!" flashes on the l.h. side at the
bottom of the display (display area
for current operating states).
The warning appears in the display
as plain text with an additional iden-
tifier.
The display of warnings is subject to
access rights.
Note
Standard display: The note symbol
"i" flashes on the l.h. side at the bot-
tom of the display (display area for
current operating states).
The note appears in the display as
plain text with an additional identi-
fier.
114
(cont.)
The fault message with an addi-
tional identifier appears in the dis-
play.
Message via communication facility
(e.g. Vitodata, Vitocom).
Faults are written to the "Messages"
and "Message history" lists.
The machine is no longer in stan-
dard mode; the fault must be
removed as quickly as possible.
Warnings are written to the "Mes-
sages" and "Message history" lists.
The appliance continues to operate
without limitation, however the
cause for the warning must be
removed.
Recommendation: To scan further
warnings enter the access code for
contractors (see page 108).
The display of notes is subject to
access rights.
Notes are written to the "Messages"
and "Message history" lists.