Water in the bottom of the dishwasher after a cycle is a classic — and usually simple — problem. A lot of the time it's something you can clear in a few minutes, especially if a new garbage disposal was just installed. Here are the causes in the order we check them.
Food, grease, and debris build up in the filter at the bottom of the tub and block drainage. This is the most common cause and an easy clean.
Check it: Remove the bottom rack, twist out the filter, and rinse it under hot water. Clear any debris in the sump.
If a new garbage disposal was recently installed and the dishwasher won't drain, the installer likely forgot to knock out the drain plug inside the disposal inlet. Extremely common.
Check it: Check under the sink — if a new disposal went in recently, the knockout plug may need to be removed from the disposal's dishwasher inlet.
The hose from the dishwasher to the disposal or standpipe can clog or kink.
Check it: Check the hose under the sink for kinks. A deep clog is a technician clear-out.
The pump that pushes water out can fail or jam with glass or debris.
Check it: A humming pump with no draining points here. Replacement is a technician repair.
A one-way valve keeps drained water from flowing back; if it sticks, drainage suffers.
Check it: Not a typical DIY check. Diagnosed by a technician.
The vast majority of dishwasher drain problems are cheap fixes — a filter clean, a knockout plug, or a hose. Even a drain pump is an affordable part. A dishwasher that won't drain is almost always worth repairing.
In Middle Tennessee or the Baton Rouge area? We'll come to you, same-day. Anywhere else in the U.S.? Send a 10-second video, a real technician tells you exactly what's wrong for $50 (credited toward the repair), and we ship you the exact part. 24/7 — text, call, or upload anytime.
A small amount is normal; a full pool after a cycle means it didn't drain. The usual causes are a clogged filter, a garbage-disposal knockout plug that was never removed, a kinked drain hose, or a failed drain pump.
This is very common. New disposals ship with a knockout plug in the dishwasher inlet that must be removed during installation. If it was missed, the dishwasher can't drain into the disposal. Removing the plug fixes it.
Often yes — cleaning the filter and checking the disposal knockout are safe, simple steps. If the drain pump has failed or there's a deep clog, that's a technician repair.