97
5790 980 - 04
Vitoligno 300-C Installation/Service
Troubleshooting
Fault Display
(continued)
Calling up fault codes from the fault memory (fault history)
The 10 most recent faults are saved and can be called up.
Faults are sorted by date. The most recent fault is
given the fault number 1.
Press the following keys:
1.
d
+
å
simultaneously for approx. 4 sec.
The “Service” menu appears.
2.
|
/
~
for “Fault history”.
3.
d
to confirm.
4.
|
/
~
for “Display”.
5.
ä
until the default display is shown.
Deleting the fault codes from the fault memory
Press the following keys:
1.
d
+
å
simultaneously for approx. 4 sec.
The “Service” menu appears.
2.
|
/
~
for “Fault history”.
3.
d
to confirm.
4.
|
/
~
for “Delete”.
5.
|
/
~
for “Yes”.
6.
d
to confirm.
7.
ä
until the default display is shown.
Fault codes
Fault code displayed
System characteristics
Cause
Measures
0A
System circuits cannot be
controlled
No connection to the
heating circuit PCB (HKK)
Check connection
between boiler PCB and
heating circuit PCB.
Notify heating contractor
11
Burner blocked
No connection to the
auxiliary
PCB (ZPK)
Check connection
between boiler PCB,
heating circuit PCB and
auxiliary PCB.
Notify heating contractor.
20
Burner blocked
Short circuit, boiler water
temperature sensor
Check boiler water
temperature sensor.
21
Return temperature
raising facility valve
opening
Boiler circuit pump starts
Short circuit, boiler return
temperature sensor
Check boiler return
temperature sensor.
22
Burner blocked
Short circuit, flue gas
temperature sensor
Check flue gas temperature
sensor.
23
Burner blocked
Problem with O
2
sensor
Check the O
2
sensor and
calibrate it
24
Control unit set to 32°F
(0°C) outdoor temperature
Short circuit, outdoor
temperature sensor
Check outdoor temperature
sensor.
25
No DHW heating
Short circuit, top buffer
tank temperature sensor
Check top buffer tank
temperature sensor.
