A standard residential dishwasher typically drains wastewater between two and four times during a complete normal wash and dry cycle. The appliance pumps out dirty water at the end of the initial pre-wash phase, again following the main detergent wash phase, and finally during one or two subsequent clear water rinse phases to ensure all suspended food particles are completely expelled from the tub. You can troubleshoot cycle operations easily by listening for the drain pump hum. You can verify normal appliance function when observing the dishwasher transition smoothly from washing to draining phases ensures that waste water evacuates the tub efficiently throughout the multi-stage cleaning program.
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