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
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
31
Primary out sen-
sor
38
Primary in sen-
sor
Lead broken
Check the terminals; replace
the sensor, if required
39
Primary out sen-
sor
40
Flow sensor
HC 2
Short circuit
Check the sensor; replace if
required
42
External HS
External heat source
faulty
Check external heat source
44
Flow sensor NC
Short circuit
Check the sensor; replace if
required
45
Room tempera-
ture sensor NC
Control unit diagnostics
(cont.)
59
Troubleshooting
55
92
901
GB
Service
Summary of Contents for VITOCAL 300
Page 19: ...Connection diagram Open CLOSE System version 1 cont 19 Preparing for installation 5592 901 GB...
Page 22: ...Connection diagram Open CLOSE System version 2 cont 22 Preparing for installation 5592 901 GB...
Page 137: ...Control PCB 137 Connection and wiring diagrams 5592 901 GB Service...
Page 140: ...Parts lists cont 140 Parts lists 5592 901 GB...
Page 141: ...Parts lists cont 141 Parts lists 5592 901 GB Service...
Page 159: ...159 5592 901 GB...