With the filter removed, look into the sump (the basin). You will see the impeller—a small plastic wheel that pushes water out. Try to spin it with your fingers; it should rotate freely. If it’s stuck, you may have a piece of broken glass or a kernel of corn wedged in the blades. Carefully dislodge it with a screwdriver or a bent wire hanger. Near the impeller is a one-way rubber flap called the check valve, which prevents water from flowing back into the machine. Ensure this flap moves freely and is not clogged with gunk.
A blocked dishwasher drain is a frustrating but eminently solvable problem. In the vast majority of cases, the solution is as simple as cleaning a forgotten filter or freeing a stuck impeller. By methodically working from the simplest fix to the more complex—safety, filter, sump, hose, and disposal connection—you can save yourself the cost of a service call and the inconvenience of hand-washing dishes. With a little time and a bit of elbow grease, you can restore your dishwasher to its full, draining glory. how to clear a blocked dishwasher drain
If you have followed all these steps—cleaned the filter, freed the impeller, flushed the hose, and checked the disposal—and the dishwasher still won’t drain, the problem may be mechanical. The drain pump motor itself could be burned out, the main control board might be faulty, or there could be a deep clog in the internal plumbing that you cannot access. At this point, continuing to disassemble the machine could cause more harm than good, and it is time to call a qualified appliance repair technician. With the filter removed, look into the sump (the basin)
Once you have reassembled everything, run a cleaning cycle to ensure the drain is fully clear. Pour one cup of baking soda down the drain hole at the bottom of the dishwasher, followed by one cup of white vinegar. Let this fizzy mixture sit for 15 minutes. The chemical reaction helps dissolve any remaining soap scum or grease. Then, run a short hot-water cycle. This will also deodorize the machine, leaving it fresh and clean. If it’s stuck, you may have a piece
If the filter and sump are clean but water remains, the blockage is likely in the drain hose. This is the corrugated plastic or rubber tube that runs from the dishwasher to the garbage disposal or the sink’s drainpipe under the sink. First, disconnect the hose from the disposal or drainpipe. Place a bucket underneath because trapped water will pour out. Use a wet/dry vacuum to suck water and debris from the end of the hose. If you don’t have a vacuum, carefully blow through the hose (after sanitizing it) or use a long, flexible brush designed for this purpose.
Most drainage problems are not complex mechanical failures but simply a neglected filter. The filter is a cylindrical or mesh screen located at the bottom of the dishwasher tub, around the base of the lower spray arm. Remove the bottom rack to access it. In many models, the filter twists counter-clockwise and lifts out.