Viessmann Vitocal 300-G Installation And Service Instructions Manual page 120

Troubleshooting
Control unit diagnostics
Access
Press "Standard display" (see
page 117): Fault messages appear.
"ALL" ("º" appear behind all mes-
sages)
Skip messages
To make adjustments/scans at the
control unit:
Note
If an acknowledged fault is not
removed, the message will be re-dis-
played the following day at 07:00 h.
Message display
All messages have a 2-digit number as identifier, the so-called "ID".
Note
The following details are required for
checking sensors:
Sensor resistance curves, see from
page 173.
Sensor identification and connec-
tion, see from page 182.
ID Message
(priority)
01 System fault
("U")
02 Delivered con-
dition after
data faults ("!")
03 Configuration
error ("!")
120
(cont.)
"BACK" to acknowledge all faults
Press "Standard display"
Access
Press "Standard display" E on
page 117: Messages appear.
"BACK":All messages will be
acknowledged simultaneously, the
message display will be hidden, the
red fault indicator continues to flash,
return to standard menu.
Access rights for 2 groups:
Heating engineer Heating contractor
Customer
1. Cause
2. Measures
1. Control unit processor faulty
2. Replace the programming unit
1. Delivered condition set after recogni-
tion of the data fault
2. The system must be reconfigured
1. Incorrect configuration of system
components
2. Creating the delivered condition and
reconfiguring the system
System user
Access
right
Customer
Customer
Customer