A method for controlling a heating unit and heating unit and computer program product for execution of the control method

The present invention relates to a method for controlling a heating unit with a burner (1) comprising a burner housing (2), a burner (1) associated with the ionization electrode (7), and a power supply (8) for applying an AC voltage between the ionization electrode ( 7) and the burner housing (2) comprising the steps of: applying an AC voltage between the ionization electrode (7) and the burner housing (2) by means of the power supply (8), and Regulation of the power of the power supply (8) upon occurrence of parasitic leakage currents. The object of the present invention is in particular to achieve an improvement in the reliability of the determination of the air / fuel ratio over the ionization current.