Fault detection for a water level detection system of a washing machine appliance

A washing machine appliance comprising:

• a wash tub positioned within a cabinet and defining a wash chamber;
• a sump positioned at a bottom of the wash tub for collecting wash fluid;
• a drain pump assembly in fluid communication with the sump for selectively draining the wash fluid collected within the sump;
• a measurement device configured for measuring movement of the wash tub;
• a water level detection system comprising a pressure sensor fluidly coupled to the sump;
• and
• a controller operably coupled to the drain pump assembly, the measurement device, and the water level detection system, the controller being configured to:
• operate the drain pump assembly to drain the wash fluid from the sump;
• measure the movement of the wash tub using the measurement device;
• measure a water level within the sump using the water level detection system;
• determine that the measured movement indicates that the sump is empty;
• determine that the measured water level indicates that the sump is not empty;
• and
• identify a fault condition in the water level detection system in response to determining that the measured movement indicates that the sump is empty and the measured water level indicates that the sump is not empty.