Dishwasher Not Draining? 7 Things to Check

 Opening the dishwasher after a cycle and finding a pool of dirty water sitting at the bottom is one of the most common dishwasher complaints out there. The good news is that it's usually something you can sort out yourself in about fifteen minutes. Here's what to check, in order.

1. Clogged filter

This is the number one cause by a wide margin. Most dishwashers have a removable filter at the bottom of the tub, underneath the lower spray arm. Food particles, labels, and general grime build up over time, and once it's clogged enough, water can't drain through it.

Pull it out and rinse it thoroughly, using an old toothbrush on anything caked on.

2. Debris blocking the drain pump

Underneath the filter, there's usually a small chamber where the drain pump sits. Glass shards, fruit stickers, bits of broken plastic — these are classic culprits that slip past the filter and jam the pump's impeller. With the dishwasher unplugged, check this area and clear out anything that doesn't belong.

3. Kinked or clogged drain hose

The hose connecting the dishwasher to the drain, often routed under the sink, can get kinked, especially if the unit's been moved recently or something got pushed against it in the cabinet. Check the entire length for sharp bends or visible blockages.

4. Clogged air gap

If your dishwasher drains through an air gap — that small cylinder on your sink or countertop — it can clog independently of the dishwasher itself. Twist off the cap and clean it out; this is an easy one to overlook since it's not part of the dishwasher.

5. Garbage disposal connection issue

If your dishwasher drains through your garbage disposal, make sure the knockout plug was actually removed during installation — a surprisingly common oversight, especially on newer installs. Also run the disposal for a few seconds before starting a dishwasher cycle to clear anything sitting in the line.

6. High loop or check valve issue

Dishwashers need either an air gap or a "high loop" in the drain hose to prevent dirty water from siphoning back in. If this loop has sagged or wasn't installed correctly, drainage can be affected. Check that the hose rises above the level of the sink drain before dropping down to connect.

7. Failed drain pump

If the filter's clean, the pump area is clear, and the hose is fine, but there's still no pump sound at all during the drain cycle, the pump motor itself may have failed. This usually means calling in a repair tech, since replacing it means accessing the bottom of the unit.

Where to start

  1. Clean the filter — this alone solves the majority of cases.
  2. Check the pump chamber for debris.
  3. Check the drain hose for kinks.
  4. If applicable, clean the air gap or check the disposal connection.

Start with the filter. It's the single most common cause, and cleaning it takes less time than reading through this list.

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