Floor cleaner

A floor cleaner comprising:

• a suction inlet;
• a recovery tank configured to store liquid drawn through the suction inlet from a surface to be cleaned, the recovery tank having a tank inlet, a tank outlet, and a tank volume configured to store the liquid;
• a fluid flow path;
• a suction motor operable to generate a suction airflow to draw liquid-laden air along the fluid flow path and into the recovery tank, wherein the fluid flow path extends from the suction inlet to an exhaust of the suction motor and directs the suction airflow through the recovery tank toward the suction motor from the suction inlet;
• a sensor disposed in the fluid flow path between the suction motor and the tank volume, the sensor configured to detect liquid in the suction airflow in the fluid flow path and generate a signal corresponding to the detected liquid, wherein the suction airflow extends from the suction inlet to the suction motor;
• and
• a controller having an electronic processor, the controller configured to:
• determine the presence of liquid in the suction airflow in the fluid flow path based on the signal of the sensor, and
• control operation of the floor cleaner based on the sensor signal exceeding a first threshold value.