A dishwasher includes a tub, a spray arm, a sump, a pump body including a partition that partitions the pump body into a first chamber and a second chamber, a communication hole defined in the partition, a pump channel that connects the sump to the first chamber, an arm channel that connects the spray arm to an interior of the second chamber, an impeller located in the second chamber and configured to rotate to supply water to the arm channel, a heating unit configured to heat water stored in the first chamber, a steam channel that connects the first chamber to the tub, and a channel controller configured to, based on rotation of the impeller, supply water that passes through at least one of the sump, the pump channel, the second chamber, or the arm channel to the steam channel to close the steam channel.

A dishwasher includes a tub, a spray arm, a sump, a pump body, the pump body including a partition between first and second chambers, a communication hole in the partition that communicates with the first and second chambers, a pump flow path that connects the sump to the first chamber, an arm flow path that connects the spray arm to the second chamber, an impeller in the second chamber, a heating unit to heat water in the first chamber, a steam flow path that connects the first chamber to the tub, a connection flow path that connects the steam flow path to the arm flow path, and a flow path valve configured to close the steam flow path based on water being supplied to the connection flow path, and to open the steam flow path based on a lack of water being supplied to the connection flow path.

A dishwasher appliance and method of operation is provided. The dishwasher appliance may include a tub defining a wash chamber, a coarse filter disposed, a recirculation pump, and a drain pump. The method may include activating the recirculation pump to flow wash fluid through the coarse filter in a primary flow direction, and activating the drain pump to flow wash fluid through the coarse filter in the primary flow direction for an initial purge cycle. Further included may be flushing wash fluid through the coarse filter and into the tub in a secondary flow direction opposite from the primary flow direction. Still further included may be activating the recirculation pump to flow wash fluid through the coarse filter in the primary flow direction, and activating the drain pump to flow wash fluid through the coarse filter in the primary flow direction for an additional purge cycle.

Apparatus (200) for the treatment of one or more substrates comprising a treatment chamber configured to receive a liquid medium and one or more substrates; a supply of a treatment gas comprising ozone; and one or more conduits to convey said treatment gas to a bubble generator (41) wherein said bubble generator is operable to form bubbles of said treatment gas in said liquid medium, wherein the apparatus comprises a multiplicity of solid particles (46). A method of treating one or more substrates, the method comprising agitating said one or more substrates in a treatment formulation comprising a multiplicity of solid particles, a liquid medium and bubbles of ozone.

Experimental color data obtained from a plurality of cleaning process verification coupons is used to determine optimized cleaning process parameters in an automated cleaning machine. Color data may also be obtained from cleaning process verification coupon(s) to verify the efficacy of a real-world cleaning processes in an automated cleaning machine and/or to obtain one or more suggested corrective action(s) in the event the cleaning process yields an unsatisfactory cleaning result. Based on the optimized cleaning process parameters, an automated cleaning machine may automatically adjust one or more cleaning process parameters to correct for non-optimized parameters sensed during execution of a cleaning process to help prevent an unsatisfactory cleaning result.

A dishwasher appliance and method of operation is provided. The dishwasher appliance may include a tub defining a wash chamber, a coarse filter disposed, a recirculation pump, and a drain pump. The method may include activating the recirculation pump to flow wash fluid through the coarse filter in a primary flow direction, and activating the drain pump to flow wash fluid through the coarse filter in the primary flow direction for an initial purge cycle. Further included may be flushing wash fluid through the coarse filter and into the tub in a secondary flow direction opposite from the primary flow direction. Still further included may be activating the recirculation pump to flow wash fluid through the coarse filter in the primary flow direction, and activating the drain pump to flow wash fluid through the coarse filter in the primary flow direction for an additional purge cycle.

The invention concerns a household appliance, the household appliance comprising: a washing chamber for washing of items to be cleaned; a water system configured to feed water to and from the washing chamber for cleaning and/or rinsing of the items therein; wherein the water system comprises a UV-treatment chamber for disinfection and/or sterilization of water to be fed to the washing chamber during operation of the household appliance, wherein the UV-treatment chamber is provided with at least a first UV-light source arranged to direct UV-light towards water present in the UV-treatment chamber. The UV-treatment chamber is further provided with at least a first UV-light reflector. The invention also concerns a method for operating a household appliance.

Disclosed a control method of a dishwasher comprising a main-washing cycle for washing one or more washing objects which are held in a tub; a rinsing cycle for rinsing the washing objects washed in the main-washing cycle by injecting wash water; a normal drying cycle for drying the washing objects rinsed in the rinsing cycle, wherein the main-washing cycle comprises a pre-steam water supply step for supplying steam water to a sump so as to supply steam to the tub; a pre-steam supply step for generating steam by heating a heater and supplying the steam to the tub; a main-wash water supply step for supplying wash water for washing to the sump, without draining the steam water supplied to the sump; a main-washing step for washing the washing objects by circulating the supplied wash water; and a main-wash water drainage step for draining the wash water.

Disclosed a control method of a dishwasher comprising a main-washing cycle for washing one or more washing objects which are held in a tub; a rinsing cycle for rinsing the washing objects washed in the main-washing cycle by injecting wash water; a normal drying cycle for drying the washing objects rinsed in the rinsing cycle, wherein the main-washing cycle comprises a pre-steam water supply step for supplying steam water to a sump so as to supply steam to the tub; a pre-steam supply step for generating steam by heating a heater and supplying the steam to the tub; a main-wash water supply step for supplying wash water for washing to the sump, without draining the steam water supplied to the sump; a main-washing step for washing the washing objects by circulating the supplied wash water; and a main-wash water drainage step for draining the wash water.

Disclosed a controlling method of a dishwasher comprising a washing tub defining a washing space in which one or more dishes are loaded and washed; a storage unit in which the dishes are loaded; an injection unit injecting wash water to the dishes; a sump provided in a lower portion of the washing tub; and a driving unit supplying and circulating the wash water stored in the sump to the injection unit, the controlling method for cleaning the washing space comprising: a water supply step for supplying wash water; a preliminary cleaning step for injecting the wash water to the storage unit without the dishes, the washing tub and the injection unit to clean the storage unit, the washing tub and the injection unit; a main cleaning step for injecting the wash water mixed with dishwashing detergent to the storage unit, the washing tub and the injection unit; a rinsing step for rinsing the storage unit, the washing tub and the injecting unit by injecting wash water; and a drying step for drying the storage unit, the washing tub and the injection unit.