Amana Dishwasher Not Draining: Causes & Fix
When an Amana dishwasher won't drain, the most common causes are a clogged drain filter and a failed drain pump, but on a newly installed unit the classic culprit is a garbage-disposal knockout plug left in place. A blocked drain hose and a stuck check valve round out the list. The filter and the knockout plug are…
Standing Water: Check the Simple Blockages First#
A dishwasher that ends with water in the bottom has lost its drain path somewhere between the sump and the sink drain. The good news is that the two most frequent causes — a clogged filter and, on new installs, a blocked disposal port — are quick to check and often fixable in minutes.
Ranked Causes on Amana Dishwashers#
| What you notice | Likely cause | How common | Fix path |
|---|---|---|---|
| Standing water; slow or no drain | Clogged drain filter | Most common | Clean the filter at the tub floor |
| Pump hums or is silent; no drain | Failed drain pump motor (Whirlpool WPW10348269) | Common | Replace the drain pump |
| Drains slowly or backs up | Drain hose blockage | Occasional | Clear the drain hose |
| Brand-new install never drains | Garbage disposal knockout plug still in place | Common on new installs | Knock out the disposal plug |
| Water siphons or won't clear | Check valve stuck | Occasional | Free or replace the check valve |
The filter leads because it catches everything the wash sheds and eventually packs full. A failed drain pump either hums without moving water or stays silent, and on Whirlpool-built Amana models the drain pump part is the WPW10348269. The knockout-plug cause is specific and worth knowing: when a dishwasher is newly connected to a garbage disposal, the disposal's shipping knockout plug must be removed, and if the installer forgets it, the dishwasher can never drain into the disposal — a "brand-new dishwasher won't drain" that isn't a fault at all.
A blocked drain hose slows or backs up the drain, and a stuck check valve can let water siphon back or fail to clear.
Do You Have the Right Tools?
Water pressure gauge ($60), spray arm tester, float switch multimeter ($85), and drain inspection camera. Our technician arrives with $3,000+ in professional tools — your diagnostic is free.
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How to Force a Drain and What to Check#
To clear standing water, first try canceling and starting a fresh drain: press Cancel or the drain option and let the pump run, which resets the cycle and often clears a soft blockage. If water remains, bail it out and clean the filter — on Amana models the filter is at the tub floor under the lower spray arm; twist it out, rinse away trapped food, and refit it. Check the sump area for a stray item like a bit of glass or a seed jamming the pump.
If it's a recent installation and has never drained, check the garbage disposal for the knockout plug and remove it. Beyond the filter, hose, and disposal port, the drain pump and check valve are internal repairs a technician handles. Don't keep starting cycles on a full tub, since it risks an overflow.
New-Install No-Drain Versus a Sudden One#
One question sorts this fault faster than any other: has the dishwasher ever drained, or did it just stop? A brand-new dishwasher that has never drained since installation is a strong signal for the garbage-disposal knockout plug — when a dishwasher's drain hose is connected to a new disposal, the disposal ships with a solid plug in its dishwasher inlet that the installer must knock out, and a forgotten plug leaves the water nowhere to go. That's an install oversight, not a broken part, and it's fixed in minutes by removing the plug. A dishwasher that drained fine for months and then stopped is a different story — that points at accumulation and wear: a filter that has finally packed full, a bit of debris jamming the pump, or a pump motor reaching the end of its life. Framing it as "never worked" versus "worked and quit" tells you immediately whether to look at the installation or at a clog or failing part.
Safety First — Know the Risks
Live 120V wiring in a wet environment is one of the most dangerous DIY scenarios. Water + electricity = serious shock risk. Our techs are licensed and insured — let them handle the risk.
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Getting It Fixed#
Clearing the filter or disposal plug fixes many no-drains; a failed pump needs service. Book a diagnostic and we'll confirm whether it's the filter, the pump, or the install before replacing anything.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
