A method for starting a single-phase induction motor, the motor comprising a rotor and a stator with a running winding and a starting winding, the running winding and the starting winding being connected in parallel to an alternate voltage power supply, the starting winding being electrically linked with a starting device, the starting device comprising a start switch allowing connecting and disconnecting the starting winding to/from the voltage power supply under the control of an electronic signal-processing device, the starting device comprising a source of direct current supplied from the terminals of the start switch the electronic-signal processing device being supplied by the source of direct current, the starting method being characterized by comprising the steps of: a-) firstly measuring via the starting device, the voltage between the terminals of the start switch and computing and storing an internal timebase (Tref) by the electronic signal processing device based on a plurality of detected time instants when this voltage crosses zero before closing the start switch, the internal timebase (Tref) being synchronized with the phase of the voltage power source, b-) closing the start switch, for initiating the supply of current to the starting winding of the motor; c-) measuring one or more starting time instants (Tpar) of the current in the starting winding where this crosses zero; d-) comparing the time instants (Tpar) where the current flowing through the starting winding crosses zero with the internal timebase (Tref); e-) calculating, via the starting device, a phase difference Df between the current flowing through the starting winding and the internal timebase (Tref) based on the comparison made in Step d f-) opening the start switch based on the calculation in Step e when the starting device detects the phase difference (Df) between the current flowing through the starting winding and the internal timebase (Tref) of a value in excess of a predetermined start phase boundary. a-) firstly measuring via the starting device, the voltage between the terminals of the start switch and computing and storing an internal timebase (Tref) by the electronic signal processing device based on a plurality of detected time instants when this voltage crosses zero before closing the start switch, the internal timebase (Tref) being synchronized with the phase of the voltage power source, b-) closing the start switch, for initiating the supply of current to the starting winding of the motor; c-) measuring one or more starting time instants (Tpar) of the current in the starting winding where this crosses zero; d-) comparing the time instants (Tpar) where the current flowing through the starting winding crosses zero with the internal timebase (Tref); e-) calculating, via the starting device, a phase difference Df between the current flowing through the starting winding and the internal timebase (Tref) based on the comparison made in Step d f-) opening the start switch based on the calculation in Step e when the starting device detects the phase difference (Df) between the current flowing through the starting winding and the internal timebase (Tref) of a value in excess of a predetermined start phase boundary.