Dishwashing appliances and methods, as provided herein, may include features or steps such as activating the drain pump for an activation period and receiving a pump-status signal during the activation period. Dishwashing appliances and methods may further include features or steps for detecting a pressure (P1) upstream from the drain pump during the activation period, determining a condition at the filter based on the pump-status signal and P1, and directing the drain pump based on the determined condition.

A method of determining a position of a diverter of a fluid circulation system in a dishwasher appliance includes measuring a fluid pressure in a sump of the dishwasher appliance while pumping fluid from the sump into a wash chamber of the dishwasher appliance via a first component when the diverter is in a first position. The method also includes measuring the fluid pressure in the sump of the dishwasher appliance while pumping the fluid from the sump to a filter cleaning manifold when the diverter is in a second position. Based on the measured fluid pressure, the method determines whether the diverter is in the second position.

Provided herein is a method performed by an appliance for washing and rinsing goods of detecting process water added to a sump of the appliance during interruption of operation of the appliance, upon recommence of appliance operation, and an appliance performing the method. The method may include detecting process water added to a sump of the appliance during interruption of operation of the appliance, upon recommence of appliance operation. The method may include increasing operating speed of a circulation pump of the appliance to a target speed, measuring an indication of circulation pump pressure or process water flow rate through the circulation pump, and determining that process water has been added to the sump of the appliance during the interruption in case the measured pressure or flow rate is maintained at a sufficient level after the speed of the circulation pump has reached the target speed.

A method of monitoring drainage of a washing appliance such as a dishwasher or washing machine having a pump for draining a washing chamber is disclosed. The method includes receiving a time series of power consumption data relating to the operation of the washing appliance over a monitored period of operation including pumped draining of the washing chamber. A measure of the duration of a portion of the monitored period comprising said pumped draining is derived from the time series of power consumption data. The measure of duration is then compared to a reference value and an indicator of a drainage condition is determined based on the comparison. The method may be used to detect scaling or blockages in drainage flow paths.

A method of determining a position of a diverter of a fluid circulation system in a dishwasher appliance includes measuring a fluid pressure in a sump of the dishwasher appliance while pumping fluid from the sump into a wash chamber of the dishwasher appliance via a first component when the diverter is in a first position. The method also includes measuring the fluid pressure in the sump of the dishwasher appliance while pumping the fluid from the sump to a filter cleaning manifold when the diverter is in a second position. Based on the measured fluid pressure, the method determines whether the diverter is in the second position.

A method of controlling a dishwasher is disclosed. The method includes supplying water to a sump, driving a wash pump using a wash motor, introducing a detergent into a tub, and determining whether the amount of bubbles is excessive based on the value of current applied to the wash motor. The determining whether the amount of bubbles is excessive is performed after a lapse of a predetermined period of time since the start of the introducing the detergent into the tub.

The present disclosure relates to a dishwasher having a heat pump, including a dishwasher body provided with a tub configured with a washing space therein and a sump provided at a bottom of the tub to temporarily accommodate washing water; a spray arm provided inside the washing space to spray washing water; a circulation pump that pumps the washing water of the sump; a washing water guide that guides the washing water pumped by the circulation pump to the spray arm; a heat pump provided with a compressor, an evaporator, an expansion apparatus, and a condenser provided to exchange heat in contact with the washing water of the washing water guide; and a controller that controls the heat pump to increase the temperature of the washing water of the washing water guide. As a result, it may be possible to suppress heat loss from being generated while heating washing water.

A dishwasher appliance that includes features for prevention and detection of flood events and leaks without sacrificing performance or efficiency of the dishwasher appliance is provided. Moreover, methods for detecting and preventing such flood events and leaks are also provided.

Provided herein is a method of determining whether process water is present in a circulation pump of an appliance for washing and rinsing goods, and an appliance performing the method. The method of determining whether process water is present in a circulation pump of an appliance for washing and rinsing goods may include measuring a minimum value of a property representing load of the circulation pump at a predetermined first speed, measuring a maximum value of a property representing load of the circulation pump at a predetermined second speed, the second speed being higher than the first speed, determining a relation between said minimum value and said maximum value, and determining, from said relation, whether process water is present in the circulation pump.

A dishwasher includes: a tub; a sump configured to collect wash water sprayed into the tub; a spraying arm including: first and second channels configured to independently guide the wash water; and a plurality of spraying holes configured to spray the wash water supplied to each of the channels in preset directions; a supply pump configured to supply the wash water collected in the sump to the spraying arm, the supply pump including: an impeller; and a motor configured to drive the impeller; a flow path conversion unit configured to selectively supply the wash water to the first channel or the second channel; and a controller configured to cause the flow path conversion unit to selectively supply the wash water to the first channel or the second channel by controlling the operation of the motor based on a value of an electrical current flowing through the motor.