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Fault codes
(cont.)
Displayed fault
System characteristics
code
49
No reheating suppression via
Vitosolic 100/200 possible
51
No control mode at heating
circuit 1
52
No control mode at heating
circuit 2
53
No control mode at heating
circuit 3
54
No DHW heating
55
No flow control
56
No solar yield
57
No solar yield
58
No control mode at heating
circuit 4
61
No control mode at heating
circuit 1
62
No control mode at heating
circuit 2
63
No control mode at heating
circuit 3
64
No DHW heating
65
No flow control
66
No solar yield
67
No solar yield
68
No control mode at heating
circuit 4
8A
Burner locked out
8B
Burner locked out
Cause
Lead break to
Vitosolic 100/200 (KM-
BUS)
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
Short circuit, return tem-
perature sensor
Short circuit, collector
temperature sensor
Short circuit, solar refer-
ence sensor
Short circuit, flow temper-
ature sensor, heating cir-
cuit 4
Lead break, flow tempera-
ture sensor, heating cir-
cuit 1
Lead break, flow tempera-
ture sensor, heating circuit
2
Lead break, flow tempera-
ture sensor, heating cir-
cuit 3
Lead break, cylinder tem-
perature sensor
Lead break, return tem-
perature sensor
Lead break, collector tem-
perature sensor
Lead break, solar refer-
ence sensor
Lead break, flow tempera-
ture sensor
Flue gas temperature in
load operation too low
Flue gas temperature too
high
Troubleshooting
Measures
Check KM-BUS connection to
Vitosolic
Check flow temperature sensor,
heating circuit 1
Check flow temperature sensor,
heating circuit 2
Check flow temperature sensor,
heating circuit 3
Check cylinder temperature sensor
Check return temperature sensor
Check collector temperature sen-
sor
Check solar reference sensor
Check flow temperature sensor,
heating circuit 4
Check flow temperature sensor,
heating circuit 1
Check flow temperature sensor,
heating circuit 2
Check flow temperature sensor,
heating circuit 3
Check cylinder temperature sensor
Check return temperature sensor
Check collector temperature sen-
sor
Check solar reference sensor
Check flow temperature sensor
Check position of ash box and fit
■
correctly if necessary
Check flue gas temperature sen-
■
sor
Check air dampers
■
Clean the boiler
■
Check flue gas temperature sen-
■
sor
Check air dampers
■
121
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