Whirlpool WDT790SLYM3 Dishwasher Not Draining – What Fixes This Problem?
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Understanding the Problem
If your Whirlpool WDT790SLYM3 finishes a wash but there's standing water in the tub, or the cycle errors out and the dishwasher smells, the unit is likely not draining properly. This problem is usually caused by a clog in the filter/sump area, a blocked or kinked drain hose, a stuck garbage disposal knockout plug, or a failed drain pump. Left unaddressed, standing water can cause odor, poor cleaning results, and leaks. Diagnosing the root cause means checking the easy items first (filter, sump, hose and disposal) and then testing the drain pump and related electrical components. Many drain problems can be resolved without removing the whole dishwasher; others require removing the toe-kick panel and testing or replacing the drain pump or control board if the pump is getting power but not running.
Common Symptoms
Standing water in tub after cycle, wash cycle error codes or flashing lights, gurgling or humming from base, dirty water not draining, bad odors from dishwasher.
Common Causes
- Clogged filter, food trap or foreign object in the sump preventing water flow
- Blocked, kinked or incorrectly routed drain hose or garbage disposal knockout plug not removed
- Failed or electrically faulty drain pump (impeller jammed or motor burned out)
Popular Parts That Fix This Problem
These are the most common replacement parts that fix this problem. When you're ready to order, click below to find the right part at PartsDiscount.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
Before replacing parts, remove the lower rack, unscrew and lift out the filter/sump assembly, and inspect/clear debris; then run a drain-only or diagnostic cycle to see if the pump runs. If you hear the pump humming but no water pumps out, the pump is likely bad.
Frequently Asked Questions
How do I force my WDT790SLYM3 to drain so I can remove the water now?
Turn off power to the dishwasher at the breaker, remove lower rack, and use a shallow cup or towels to bail out the majority of the water. Next, remove the filter and inspect the sump for debris. Restore power and run a 'drain' or 'rinse' cycle to see if the pump will remove remaining water. If the pump doesn't run but you can hear a hum, leave power on only briefly and plan to replace the pump — do not leave it running dry for long.
Can I replace the drain pump myself, and what precautions should I take?
Yes — replacing the drain pump is a common DIY repair if you are comfortable with basic tools. Safety steps: disconnect power at the breaker and turn off water supply, remove the toe-kick panel and pull the dishwasher out enough to access the pump area, place towels to catch water, disconnect hose clamps and electrical connectors, then remove the pump. Compare the replacement pump to the old unit before installation. If you're uncomfortable with electrical or accessing the pump under the tub, call a qualified appliance technician.
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