You open the dishwasher after a cycle. There's an inch of cloudy water sitting at the bottom. The dishes ran. The machine didn't complain. It just didn't drain.
This is one of the most common dishwasher calls we get. It's also one of the most misdiagnosed — because the fix depends entirely on where the blockage is. Check in the wrong order and you'll waste an hour finding nothing.
Here's the right order.
1. The Filter
Start here. Every time.
Modern dishwashers have a cylindrical filter under the lower spray arm — usually a twist-and-lift design. If you've never cleaned it, it's probably clogged. Food debris, grease, and hard-water buildup pack together into a dense plug that water can't push through.
Remove it. Rinse it under hot water. Scrub with a soft brush if needed. Reinstall it firmly — loose filters cause their own problems.
Run a short cycle. If the water drains cleanly, you're done.
This is the cause in roughly half of all standing-water calls. Five minutes. No tools.
2. The Drain Hose
If the filter is clean, look at the hose.
The drain hose runs from the dishwasher pump to the sink drain or garbage disposal inlet. It's routed through a cabinet — usually the one directly under the sink. Two failure modes:
Kink. The hose gets bent behind something and blocks flow. Pull the dishwasher out a few inches and look. A kinked hose is a fix you can do yourself.
Clog. Grease and debris accumulate inside the hose itself. Less visible. You'll need to disconnect the hose at both ends and flush it with hot water to confirm.
Also check the connection point where the hose meets the sink drain or disposal. A loose clamp or cracked fitting lets water cycle back into the tub instead of exiting.
Between the filter and the drain hose, you're covering about 80% of all dishwasher drainage problems.
3. The Garbage Disposal Connection
This one gets missed constantly — even by people who've already checked the filter.
If your dishwasher drains into a garbage disposal, there's a knock-out plug inside the disposal's dishwasher inlet. When you install a new disposal, that plug has to be removed manually before connecting the dishwasher drain line. If it wasn't removed — or the inlet is packed with debris — water has nowhere to go.
Run the disposal first. Then run the dishwasher. If drainage improves, you've found your culprit.
This is a quick check. Don't skip it.
4. The Drain Pump
The remaining 20% of cases point here.
The drain pump pushes water out of the tub through the drain hose. It can fail two ways: mechanically (the impeller breaks or seizes) or electrically (the motor burns out). Either way, the symptom is the same — the machine sounds like it's draining, but nothing moves.
A failed pump isn't something you diagnose by looking. You need to confirm the pump is getting power, then test whether it's actually running. That requires a multimeter and access to the pump housing, which sits underneath the tub.
Here's what matters: a pump is a part. It can be replaced in a single visit — but only if the tech brought the right pump for your model. That's why calling us to describe the symptom before we arrive matters. We check the model number, stock the likely part, and handle it in one trip.
A pump replacement on a mid-range dishwasher is almost always worth doing. The machine is otherwise functional. The part is available. The labor is straightforward.
The Pattern to Remember
Start with what's free and accessible. Filter. Hose. Disposal connection. In that order.
If those three are clear, the pump is the answer. It's not a catastrophe — it's a part swap. One visit, handled.
Don't let standing water sit. Stagnant water smells fast, and a clogged filter that goes ignored long enough can stress the pump motor until you go from a free fix to a necessary repair.
Check the filter tonight. That's where most of these end.
Voltage Appliance Repair serves Miami-Dade, Broward, and Palm Beach counties. Same-day visits available. Call 786-869-3888.