A method of operating a laundry washing machine comprising a recirculation circuit

A method for operating a laundry washing machine comprising:

• a washing drum configured to receive laundry to be washed;
• a washing tub external to the washing drum;
• a water supply system configured to convey water to the washing tub;
• a recirculation system comprising a recirculation circuit configured to drain liquid from a bottom of the washing tub and to re-admit the liquid into a first region of the washing tub, the recirculation system comprising a variable speed recirculation pump having an outlet connected to the recirculation circuit and wherein the recirculation pump is operable at variable rotation speeds to circulate liquid through the recirculation circuit;
• a liquid level sensor device configured to detect a liquid level inside the washing tub;
• wherein the method comprises operating the recirculation system in a recirculation phase to drain the liquid from the bottom of the washing tub and to re-admit the liquid into the first region of the washing tub through the recirculation circuit, wherein the recirculation phase comprises:
• determining a detected liquid level using the liquid level sensor device;
• determining a difference between the detected liquid level and a prefixed liquid level value;
• and
• the step of controlling the recirculation pump by varying a rotation speed of the recirculation pump depending to the difference between the detected liquid level and the prefixed liquid level value.