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Dishwasher leaves standing water or puddles at the bottom of the tub after the drain cycle — the stuck-closed piston prevents the pump from evacuating water properly.
Water drains out but immediately siphons back into the tub; a failed piston can no longer seal the check valve body against reverse flow.
Contaminated or stagnant water re-enters the wash zone due to an open or leaking check valve piston, leaving food residue and film on dishes.
Gurgling, sucking, or intermittent slapping sounds during the drain phase indicate the piston is loose, cracked, or missing its spring tension.
💡 Pro Tip: Is Your Check Valve Piston the Problem?
Your part is likely the culprit if you notice any of the following:
⚠️ Standing water or puddles remain at the bottom of the dishwasher tub after the drain cycle completes
⚠️ Drain water visibly flows back into the tub shortly after the pump stops running
⚠️ Unusual gurgling or sucking noises during or immediately after the drain phase
⚠️ Dishes come out dirty or poorly rinsed due to contaminated water re-entering during the wash cycle
🔍 Diagnosis Tip: Pull out the lower rack and lift the rear filter assembly. Inspect the piston for visible cracks, a missing or collapsed spring, white mineral scale buildup, or debris lodged under the seat. If the piston drops freely when tilted rather than spring-loading upward, it must be replaced. Hard-water households should also check for calcium deposits that can hold the valve open — a quick soak in white vinegar may temporarily free it, but a worn piston should be replaced outright.
📦 What's in the Box
✅ 1× Dishwasher Check Valve Piston & Nut Assembly (WD24X10018 compatible, approx. 0.01 lbs)
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Disclaimer: Compatibility information, part numbers, and model fitment data on this page are sourced from manufacturer databases and third-party references. While we strive for accuracy, please verify your appliance model number before ordering. Heima is not responsible for errors or omissions in compatibility listings.
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