System Operation
Messages / Faults
Fault code number
Aids
Ü 720
Ignition transformer switched on too long
H6
Ü 721
Ignition valve opened too long
H6
Ü 722
Fuel valves opened in servicing mode
H6
Ü 723
Ignition sequence lasts too long
H6
Ü 724
Gas valves opened in oil fuel mode
H6
Ü 725
Oil valves opened in gas fuel mode
H6
Ü 726
Main gas 1 opened without main gas 2
H6
Ü 727
Main gas 1 opened inadmissibly
H6
Ü 728
Main gas valves and ignition valve opened too long
H6
Ü 729
Ignition sequence lasts too long (without pilot burner)
H6
Ü 730
Servicing mode without pilot burner
H6
Ü 731
Ignition valve opened, although unit
configured without pilot burner
H6
Ü 732
Incorrect signal combination during operation
H6
Ü 733
Incorrect signal combination after operation
H6
Ü 734
Pre-ventilation time not adhered to
H6, H8
Ü 735
Fuel safety interlock circuit missing
H6
Ü 736
Leakage test: Both gas valves opened
H6
Ü 737
Leakage test: Main gas 2 shut-off delayed too long
H6
Ü 738
Leakage test: Incorrect sequence
H6
Ü 739
Leakage test: Main gas 2 open too long
H6
Ü 741
Leakage test: Main gas 1 open too long
H6
Ü 743
Flame detection: flame after-burn too long
H7
Ü 744
Flame detection: flame back on
H6
Ü 745
Program monitoring time too long
Ü 713
Incorrect signal combination in AU mode
H6
Ü 714
Incorrect signal combination in BE mode
H6
Ü 715
Incorrect signal combination in VO mode
H6
Ü 716
Incorrect signal combination in ZP mode
H6
Ü 717
Incorrect signal combination in ZÜ mode
H6
88