Technical information

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KWE P/N 394038 Versatronik 505 and 505D BACIP Gateway V1.2 February 2014 Technical information subject to change without notice
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