23
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
ce
Appendix A—Fault Codes Continued
Error codes for Viessmann control units based on controls/equipment installed
Fault Codes Continued
C5
Fault, speed controlled pump heating circuit 1 (KM-BUS)
C6
Fault, speed controlled pump heating circuit 2 (KM-BUS)
C7
Fault, speed controlled pump heating circuit 3 (KM-BUS)
C8
Fault, water level control
C9
Fault, maximum pressure
CA
Fault, minimum pressure/maximum pressure 2
Cb
Fault, maximum pressure 2
CC
Reserved, external periphery
Cd
Communication fault, Vitocom 300 (KM-BUS)
CE
Communication fault, fault indicator module (KM-BUS)
CF
Communication fault: wrong LON module
d1
Burner fault, boiler
d4
Fixed high limit fault, boiler
d5
Cascade: boiler is not responding
d6
External fault 1, plug-in adaptor
d7
External fault 2, plug-in adaptor
d8
External fault 3, plug-in adaptor
dA
Short circuit, room temperature sensor heating circuit 1
db
Short circuit, room temperature sensor heating circuit 2
dC
Short circuit, room temperature sensor heating circuit 3
dd
Interruption, room temperature sensor heating circuit 1
dE
Interruption, room temperature sensor heating circuit 2
dF
Interruption, room temperature sensor heating circuit 3
E0
Fault, external participant/device connected to LON
Fault Code (hex)
Description
E4
Fault power supply voltage
E5
Internal fault combustion control unit
E6
Flue gas/air supply system blocked
F0
Communication fault combustion control unit
F1
Flue gas temperature limit has tripped
F2
Temperature limit has tripped
F3
Flame signal is present at burner start
F4
Flame signal is not present
F5
Air pressure switch not open for burner start
F6
Gas pressure switch not open for burner start
F7
Air pressure sensor short circuit or offset value outside of tolerances
F8
Fuel valve closure delayed
F9
Blower speed too low at burner start
FA
Blower speed too high at burner start
FC
Control of modulation valve defective
FD
Fault combustion control unit
FE
Coding plug defective or wrong EMV error
FF
Internal fault
Fault Code (Dec)
197
198
199
200
201
202
203
204
205
206
207
209
212
213
214
215
216
218
219
220
221
222
223
224
228
229
230
240
241
242
243
244
245
246
247
248
249
250
252
253
254
255