A heating system, comprising: a radio frequency, RF, signal source configured to supply an RF signal; an impedance matching network electrically coupled to an output of the RF signal source, the impedance matching network (360; 400) including: a first variable inductance network, and a second variable inductance network; a transmission path electrically coupled between the impedance matching network (360; 400) and an electrode, wherein the RF signal generates a forward signal along the transmission path; power detection circuitry configured to determine a phase angle between the forward signal and a reflected signal along the transmission path; and a controller configured to: determine that the phase angle between the forward signal and the reflected signal is greater than a threshold phase angle value, modify, based on the phase angle between the forward signal and the reflected signal, the first variable inductance network to modify a series inductance of the impedance matching network (360; 400) to reduce the phase angle between the forward signal and the reflected signal to a first phase angle that is less than the threshold phase angle value, determine that a ratio of a power of the reflected signal to a power of the forward signal is greater than a threshold power ratio, and after modifying the series inductance of the impedance matching network, modify the second variable inductance network to modify a shunt inductance of the impedance matching network (360; 400) to reduce the ratio of a power of the reflected signal to a power of the forward signal to a first power ratio that is less than the threshold power ratio. a radio frequency, RF, signal source configured to supply an RF signal; an impedance matching network electrically coupled to an output of the RF signal source, the impedance matching network (360; 400) including: a first variable inductance network, and a second variable inductance network; a first variable inductance network, and a second variable inductance network; a transmission path electrically coupled between the impedance matching network (360; 400) and an electrode, wherein the RF signal generates a forward signal along the transmission path; power detection circuitry configured to determine a phase angle between the forward signal and a reflected signal along the transmission path; and a controller configured to: determine that the phase angle between the forward signal and the reflected signal is greater than a threshold phase angle value, modify, based on the phase angle between the forward signal and the reflected signal, the first variable inductance network to modify a series inductance of the impedance matching network (360; 400) to reduce the phase angle between the forward signal and the reflected signal to a first phase angle that is less than the threshold phase angle value, determine that a ratio of a power of the reflected signal to a power of the forward signal is greater than a threshold power ratio, and after modifying the series inductance of the impedance matching network, modify the second variable inductance network to modify a shunt inductance of the impedance matching network (360; 400) to reduce the ratio of a power of the reflected signal to a power of the forward signal to a first power ratio that is less than the threshold power ratio. determine that the phase angle between the forward signal and the reflected signal is greater than a threshold phase angle value, modify, based on the phase angle between the forward signal and the reflected signal, the first variable inductance network to modify a series inductance of the impedance matching network (360; 400) to reduce the phase angle between the forward signal and the reflected signal to a first phase angle that is less than the threshold phase angle value, determine that a ratio of a power of the reflected signal to a power of the forward signal is greater than a threshold power ratio, and after modifying the series inductance of the impedance matching network, modify the second variable inductance network to modify a shunt inductance of the impedance matching network (360; 400) to reduce the ratio of a power of the reflected signal to a power of the forward signal to a first power ratio that is less than the threshold power ratio.