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Fault display
(cont.)
Fault code dis-
System characteristics
played
32
Control mode
33
Boiler running with fixed air
damper setting
34
All heating circuits regulate to
0 °C outside temperature
35
No DHW heating
36
Control mode
37
Control mode
3E
Burner blocked
41
No heating operation, mixer
module 1
42
No heating operation, mixer
module 2
43
No heating operation, mixer
module 3
44
No room influence from re-
mote control unit 1
45
No room influence from re-
mote control unit 2
46
No room influence from re-
mote control unit 3
51
No heating system control,
heating circuit 1
52
No heating system control,
heating circuit 2
53
No heating system control,
heating circuit 3
54
No DHW heating
55
No flow control, DHW heating Short circuit, return tem-
61
No heating system control,
heating circuit 1
62
No heating system control,
heating circuit 2
Cause
Lead break, flue gas tem-
perature sensor
No variation of the residu-
al oxygen content in the
flue gas over a prolonged
period
Lead break, outside tem-
perature sensor
Lead break, top buffer
temperature sensor
Lead break, centre buffer
temperature sensor
Lead break, bottom buffer
temperature sensor
Current flue gas fan speed
does not match set speed.
Break in lead to mixer
module 1
Break in lead to mixer
module 2
Break in lead to mixer
module 3
No connection between
boiler and remote control
unit 1
No connection between
boiler and remote control
unit 2
No connection between
boiler and remote control
unit 3
Short circuit, flow temper-
ature sensor, heating cir-
cuit 1
Short circuit, flow temper-
ature sensor, heating cir-
cuit 2
Short circuit, flow temper-
ature sensor, heating cir-
cuit 3
Short circuit, cylinder tem-
perature sensor
perature sensor, DHW
heating
Lead break, flow tempera-
ture sensor, heating circuit
1
Lead break, flow tempera-
ture sensor, heating circuit
2
Troubleshooting
Measures
Check flue gas temperature sen-
sor.
Check Lambda probe.
■
Recalibrate Lambda probe if nec-
■
essary
Check outside temperature sensor.
Check top buffer temperature sen-
sor.
Check centre buffer temperature
sensor.
Check bottom buffer temperature
sensor.
Check flue gas fan.
Check connection to mixer module
1.
Check connection to mixer module
2.
Check connection to mixer module
3.
Check KM BUS connection be-
tween boiler and remote control
unit 1.
Check KM BUS connection be-
tween boiler and remote control
unit 2.
Check KM BUS connection be-
tween boiler and remote control
unit 3.
Check flow temperature sensor,
heating circuit 1.
Check flow temperature sensor,
heating circuit 2.
Check flow temperature sensor,
heating circuit 3.
Check cylinder temperature sen-
sor.
Check return temperature sensor,
DHW heating.
Check flow temperature sensor,
heating circuit 1.
Check flow temperature sensor,
heating circuit 2.
53
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