Dishwasher Not Draining? DIY Fixes & When to Call

A dishwasher that won't drain is almost always one of five things: a clogged filter, a kinked drain hose, a blocked air gap, a garbage disposal knockout plug left in place after a new install, or a clogged sink drain the dishwasher feeds into. Check those five before you assume the pump is dead — they account for most of the calls we get, and all five are things you can look at yourself in under 15 minutes. If you've checked them and there's still standing water in the tub, it's likely the drain pump, a stuck check valve, or the control board, and that's when it's worth booking a technician.

Here's the order we actually check things on a real service call, from fastest and free to what needs a tech.

The 5-minute checks before you call anyone

Do these in order. Most dishwashers that "won't drain" are fixed by the first two.

• Filter. Almost every modern dishwasher has a removable filter assembly at the bottom of the tub, usually a twist-and-lift cylinder or a mesh screen under the lower spray arm. Food scraps, glass shards, and labels collect here and eventually block drainage entirely. Pull it, rinse it under the tap, and put it back — this alone clears the problem more often than anything else on this list.
• Garbage disposal knockout plug (new installs only). If the dishwasher is newly installed and drains into a garbage disposal, the disposal has a knockout plug inside the drain inlet that has to be removed before the dishwasher hose is connected. If nobody removed it, the dishwasher can fill and wash normally but never drain — it looks exactly like a pump failure. Check the installer's paperwork, or look inside the disposal inlet with a flashlight for a disc that shouldn't be there.
• Kinked drain hose or missing high loop. The corrugated hose that runs from the dishwasher to the sink drain or disposal needs either a high loop (mounted up under the counter before it drops to the drain) or an air gap — without one, dirty sink water can siphon back into the dishwasher, and a hose that's been pushed flat against the cabinet wall during installation can also just kink and block flow outright. Pull the dishwasher out slightly and look for a sharp bend.
• Air gap. If you have the small chrome cylinder on the counter or sink deck near the faucet, that's the air gap — it can clog with the same gunk that clogs the filter. Twist the cap off and clear any debris; if water is pooling around its base when the dishwasher runs, that's your sign it's blocked.
• Kitchen sink drain. Since most dishwashers drain through the same line as the kitchen sink (or through the disposal), a slow or clogged sink drain backs up into the dishwasher too. Run the sink — if it drains slowly on its own, that's a plumbing clog, not a dishwasher problem, and clearing it with a plunger or calling a plumber often fixes the dishwasher at the same time.

How to fix a dishwasher that's not draining, step by step

1. Turn the dishwasher off and, if there's standing water, bail most of it out with a cup — leave a little in the sump so the seals don't dry out.
2. Remove and rinse the filter assembly (check your model's manual for the twist direction — most are counterclockwise).
3. Check the disposal knockout plug if this is a new or recently reinstalled dishwasher.
4. Pull the dishwasher out a few inches and inspect the drain hose for kinks; confirm there's a high loop or air gap in the drain path.
5. Clear the air gap if you have one, and run the kitchen sink to confirm it drains normally.
6. Run a short cycle and watch it drain. If water is now clearing from the tub, you're done — no call needed.

If you've done all six steps and the tub still isn't draining, the problem is inside the machine — most likely the drain pump, a check valve that's stuck closed, or (less often) the control board not sending the drain command at all.

When it's the drain pump, check valve, or control board

A few signs point past a clog and toward an internal part:

• You hear a hum or buzz during the drain portion of the cycle, but no water moves.
• Complete silence where the pump should be running — the motor may be dead.
• Water drains partway, then stops, cycle after cycle (a check valve or motor winding failing intermittently).
• The dishwasher never even attempts to drain — no sound at all at the point in the cycle it should start.

These aren't DIY repairs — the drain pump sits under the tub and usually means pulling the unit out from the cabinet. This is where a $100 diagnostic pays for itself: we confirm which part failed before quoting anything, and that diagnostic is credited to the repair if you go ahead.

Brand-specific quirks

Bosch dishwasher not draining

Bosch dishwashers display error code E24for a drain circuit fault. Don't assume that means the pump is bad — check the filter and drain hose first, since a simple clog is still the most common cause of an E24, even though the code itself points at the drain electronics.

Whirlpool dishwasher not draining

Whirlpool models lean heavily on the filter and air gap for drain problems — their filters sit lower in the tub and clog faster with food debris than some competitors. If the filter's clean, the next most common Whirlpool failure is the drain pump itself.

Frigidaire dishwasher not draining

Frigidaire dishwashers are prone to drain hose kinks after installation, since the factory hose is on the shorter side and gets pinched against the cabinet wall more easily than other brands. Check the hose routing before assuming a part has failed.

GE dishwasher not draining

On GE dishwashers, check the garbage disposal knockout plug first if the unit is newly installed — it's one of the more common oversights we see on GE builder-grade units installed alongside a new disposal. Past that, filter and drain pump checks apply the same as any brand.

What dishwasher drain repair costs in NYC

When it is a part — drain pump, check valve, or control board — our standard "not draining / standing water" repair is $340 all-in, which includes the $100 diagnostic credited toward the job. Premium or built-in units with tighter cabinet access run up to $500. If the diagnostic turns up a clog you could've cleared yourself, we'll say so — you only pay the $100 diagnostic, and we'll show you what to check next time.

When to call a pro

• You've cleared the filter, hose, air gap, and sink drain and it still won't drain
• You hear the pump humming but no water moves
• Water is pooling outside the dishwasher, on the floor or under the cabinet
• The unit shows a drain-related error code (Bosch E24, or similar on other brands)
• It's a built-in unit and pulling it out yourself risks the cabinetry or countertop

Same-day service across Brooklyn, Queens, and Manhattan below 110th Street. $100 flat diagnostic, credited to the repair. 90-day parts-and-labor warranty.

Frequently asked questions