System Operation
Messages / Faults
Fault code number
Aids
Ü 746
Solenoid valve cur-out defective
H6
Ü 747
Leakage test: venting into boiler not permitted
H6
Ü 750
Fault cut-out via the BUS
Ü 751**
No data transfer via BUS (time-out)
Ü 760
Fuel change not permitted during adjustment
G3
Ü 791**
BUS master is stopped
Ü 792**
BUS data length is wrongly designed
Ü 793**
BUS master is disconnected
H / Ü 800
Error in the parameters,
A7,A9,
at parameter No.
A14
H / Ü 900
Fault in sequencer internal self-test
A7
H / Ü 901
Terminal 10
+
24 volt cut-out defective
A7,A21,A22
H / Ü 902
Fault in over-voltage self-test
A7
H / Ü 903
Fault in optical coupler self-test
A7,G7
Ü 904*
Fault in the load reference
A7,A21
Ü 905*
Fault in the reference element of the main processor
A7,A21
H 906*
Fault in the reference element of the monitoring processor
A7,A21
Ü 911*
Fault in the reference, channel 1
A7,A21
Ü 912*
Fault in the reference, channel 2
A7,A21
Ü 913*
Fault in the reference, channel 3
A7,A21
Ü 914*
Fault in the reference, channel 4
A7,A21
Ü 915*
Fault in the reference, channel 5
A7,A21
H / Ü 921
Relay driver self test: terminal 11 output defective
A19,A7,A25
H / Ü 922
Relay driver self test: terminal 16 output defective
A19,A7
H / Ü 923
Relay driver self test: terminal 43 output defective
A19,A7
H / Ü 924
Relay driver self test: terminal 67 output defective
A19,A7
H / Ü 925
Relay driver self test: terminal 45 output defective
A19,A7,A25
H / Ü 926
Relay driver self test: terminal 68 output defective
A19,A7
H / Ü 927
Relay driver self test: terminal 36 output defective
A19,A7
H / Ü 928
Relay driver self test: terminal 41 output defective
A19,A7
H / Ü 929
Relay driver self test: terminal 76 output defective
A19,A7
H / Ü 998
Internal fault:
A7
H 999
Internal fault:
A7
89
