Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 98

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