Dishwashing appliances and methods for evaluating pressure therein

A dishwashing appliance, comprising:

• a cabinet;
• a tub positioned within the cabinet and defining a wash chamber for receipt of articles for washing;
• a door mounted to the cabinet to selectively restrict access to the tub;
• a spray assembly positioned within the wash chamber;
• a circulation pump in fluid communication with the wash chamber;
• a pressure sensor upstream of the circulation pump;
• and
• a controller in operative communication with the pressure sensor and the circulation pump, the controller being configured to initiate a washing operation, the washing operation comprising
• activating the circulation pump,
• determining pressure at the pressure sensor exceeds a pressure threshold following activating the circulation pump,
• initiating a baseline time period in response to determining pressure at the pressure sensor exceeds the pressure threshold,
• determining pressure at the pressure sensor reduces to or below the pressure threshold prior to expiration of the baseline time period,
• detecting movement of the door from a closed position following determining pressure at the pressure sensor exceeds the pressure threshold,
• detecting return of the door to the closed position,
• calculating a modified time period for flood detection,
• determining pressure at the pressure sensor exceeds the pressure threshold following detecting return of the door to the closed position,
• initiating the modified time period in response to determining pressure at the pressure sensor exceeds the pressure threshold following detecting return of the door to the closed position, and
• directing the circulation pump based on determining pressure at the pressure sensor exceeds the pressure threshold following detecting return of the door to the closed position and expiration of the modified time period.

A method of operating a dishwashing appliance comprising a tub, a pressure sensor mounted within the tub, a door selectively restricting access to the tub, and a circulation pump downstream from the pressure sensor, the method comprising:

• activating the circulation pump;
• detecting movement of the door from a closed position;
• detecting return of the door to the closed position;
• calculating a modified time period for flood detection;
• determining pressure at the pressure sensor exceeds a pressure threshold following detecting return of the door to the closed position;
• initiating the modified time period in response to determining pressure at the pressure sensor exceeds the pressure threshold;
• and
• directing the circulation pump based on determining pressure at the pressure sensor exceeds the pressure threshold and expiration of the modified time period,
• wherein the modified time period is calculated as a function of a temperature difference between an ambient temperature value and a temperature value within a flow path of the circulation pump.