Vitoligno 300-C Installation/Service
5790 980 - 04
98
Troubleshooting
Fault Display
(continued)
Fault codes
Fault code displayed
System characteristics
Cause
Measures
25
No DHW heating
Short circuit, top buffer tank
temperature sensor
Check top buffer tank
temperature sensor.
26
Control mode
Short circuit, buffer tank
temperature sensor 2
Check centre buffer tank
temperature sensor.
27
Control mode
Short circuit, buffer tank
temperature sensor 3
Check bottom buffer tank
temperature sensor.
28
Control mode
Short circuit, buffer tank
temperature sensor 4
Check bottom buffer tank
temperature sensor.
29
Control mode
Short circuit, buffer tank
temperature sensor 5
Check bottom buffer tank
temperature sensor.
30
Burner blocked
Lead break, boiler supply
temperature sensor
Check boiler supply
temperature sensor.
31
Return temperature raising
facility valve opening
Boiler circuit pump starts
Lead break, boiler supply
temperature sensor
Check boiler return
temperature
32
Burner blocked
Lead break, flue gas
temperature sensor
Check flue gas temperature
sensor.
33
Burner blocked
Problem with O
2
sensor
Check the O
2
sensor and
calibrate it
34
Control unit set to 32°F
(0°C) outdoor temperature
Lead break, outdoor
temperature sensor
Check outdoor temperature
sensor.
35
No DHW heating
Lead break, buffer tank
temperature sensor 1 (top)
Check buffer tank
temperature sensor.
36
Control mode
Lead break, buffer tank
temperature sensor 2
Check buffer tank
temperature sensor.
37
Control mode
Lead break, buffer tank
temperature sensor 3
Check buffer tank
temperature sensor.
38
Control mode
Lead break, buffer tank
temperature sensor 4
Check buffer tank
temperature sensor.
39
Control mode
Lead break, buffer tank
temperature sensor 5
Check buffer tank
temperature sensor.
3D
Burner blocked
Ash box missing.
Check ash box position.
3E
Burner blocked
Current flue gas fan speed
does not match set speed.
Check flue gas fan.
41
No control mode at heating
circuit 1 (KM-BUS)
Lead break to extension
kit 1 (KM-BUS)
Check connection to
extension kit 1.
42
No control mode at heating
circuit 2 (KM-BUS)
Lead break to extension
kit 1 (KM-BUS)
Check connection to
extension kit 2.
43
No control mode at heating
circuit 3 (KM-BUS)
Lead break to extension
kit 1 (KM-BUS)
Check connection to
extension kit 3.
44
No room influence at remote
control with room temperature
capture 1 (KM-BUS)
Lead break to remote control
with room temperature
capture 1 (KM-BUS)
Check connection to remote
control room temperature
capture.
45
No room influence at remote
control with room temperature
capture 2 (KM-BUS)
Lead break to remote control
with room temperature
capture 2 (KM-BUS)
Check connection to remote
control room temperature
capture.
46
No room influence at remote
control with room temperature
capture 3 (KM-BUS)
Lead break to remote control
with room temperature
capture 3 (KM-BUS)
Check connection to remote
control room temperature
capture.