Viessmann VITOCAL 200-G, Installation And Service Instructions Manual

Page: 115 / 208

Scanning all stored ("historic") fault messages
Menu item
& " Information "
& " Statistics "
& " Fault history "
–
Press " TIME ", to display the time
of the fault occurrence
–
Press " FAULT " to return to the
fault description.
& " BACK "
Note
The fault messages cannot be
acknowledged in the fault history.
Skipping fault messages
To enable adjustments/scans at the
control unit:
1. Open the programming unit flap. All
current fault messages will be dis-
played.
2. Press " BACK ".
The main menu will be displayed.
You can now make adjustments
and scans.
Displaying fault messages
Note
The sensor resistance curves required for testing the sensors are on page 173.
Fault messages Cause Measures
System fault Control unit processor
faulty Replace programming unit
10 Outside tempera-
ture sensor Short circuit Check the sensor; replace if
required
18 Outside tempera-
ture sensor Lead broken Check the terminals; replace
the sensor, if required
20 Sec. flow sensor Short circuit Check the sensor; replace if
required
28 Sec. flow sensor Lead broken Check the terminals; replace
the sensor, if required
30 Primary in sen-
sor Short circuit Check the sensor; replace if
required
38 Primary in sen-
sor Lead broken Check the terminals; replace
the sensor, if required
Control unit diagnostics
(cont.)
115
Troubleshooting
55
92
968
GB
Service