22
KWE P
/N 3940
46 Ve
rsatronik
502 a
nd 502D
MODBUS G
atewa
y V1
.0 F
eb
2
014 Te
chni
ca
l i
nformation subj
ec
t to
ch
ange
w
ithout noti
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Appendix A—Fault Codes
Error codes for Viessmann control units based on controls/equipment installed
Fault Codes
Fault Code (hex)
Description
00
System without fault
0F
Perform maintenance check-up
10
Short circuit, outdoor temperature sensor
18
Interruption, outdoor temperature sensor
20
Short circuit, supply temperature sensor HC1/system
28
Interruption, supply temperature sensor HC1/system
30
Short circuit, boiler water temperature sensor
38
Interruption, boiler water temperature sensor
40
Short circuit, supply temperature sensor heating circuit 2
41
Short circuit, return temperature sensor heating circuit 2
44
Short circuit, supply temperature sensor heating circuit 3
45
Short circuit, return temperature sensor heating circuit 3
48
Interruption, supply temperature sensor heating circuit 2
49
Interruption, return temperature sensor heating circuit 2
4C
Interruption, supply temperature sensor heating circuit 3
4d
Interruption, return temperature sensor heating circuit 3
50
Short circuit, DHW tank temperature sensor
51
Short circuit, DHW tank temperature sensor 2
58
Interruption, DHW tank temperature sensor
59
Interruption, DHW tank temperature sensor 2
60
Short circuit, return temperature sensor 17
68
Interruption, return temperature sensor 17
70
Short circuit, supply/return temperature sensor 17B
78
Interruption, supply/return temperature sensor 17B
92
Solar: collector temperature short circuit
93
Solar: collector return temperature short circuit
94
Solar: collector DHW tank temperature sensor short circuit
9A
Solar: collector temperature sensor open circuit
9B
Solar collector return temperature sensor open circuit
9C
Solar: DHW tank temperature sensor open circuit
9F
Solar: general fault message
A7
Fault control unit wireless clock module
AE
Internal fault mixing valve
AF
Internal fault mixing valve
b0
Short circuit, flue gas temperature sensor
b1
Communication fault, programming unit (internal)
b4
Internal fault
b5
Internal fault
b6
Internal fault, invalid hardware recognition
b7
Internal fault, boiler protection coding card
b8
Interruption, flue gas temperature sensor
bA
Fault, mixing valve module (KM-BUS)
bC
Fault, Vitotrol heating circuit 1 (KM-BUS)
bd
Fault, Vitotrol heating circuit 2 (KM-BUS)
bE
Fault, Vitotrol heating circuit 3 (KM-BUS)
C1
External fault indication, boiler
C2
Communication fault solar control unit (KM-BUS)
Fault Code (Dec)
00
15
16
24
32
40
48
56
64
65
68
69
72
73
76
77
80
81
88
89
96
104
112
120
146
147
148
154
155
156
159
167
174
175
176
177
180
181
182
183
184
186
188
186
190
193
194