When a residential dishwasher is blocked and refusing to drain wastewater, you can follow a structured troubleshooting process to clear the obstruction. First, bail out standing water and remove the lower dish rack along with the cylindrical plastic filter basket at the base of the tub. Second, scrub away trapped food sludge and check the drain pump impeller for lodged debris like glass shards. Third, disconnect the flexible drain hose beneath the sink and inspect it for clogs. You can troubleshoot drainage blocks easily. You can verify that your corrective action is successful when clearing out the food debris and running a forced drain cycle causes the standing water to pump out completely through the kitchen sink drain.
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