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
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