Opened your dishwasher to find a pool of water sitting at the bottom? A dishwasher that won’t drain is one of the most common problems we fix — and the good news is that the cause is often something simple you can check in a few minutes. Below we walk through what’s really going on, the safe checks you can do yourself, and when it’s time to call a licensed technician.
A cup or two of clean water in the filter well after a cycle can be normal. A full pool of dirty water is not — that means the dishwasher couldn’t pump the water out.
First, a 30-second safety note
- Turn the dishwasher off at the breaker before reaching near the pump or wiring.
- Let the water cool — a cycle can leave it hot.
- Have towels and a cup or small container ready to bail standing water.
Why a dishwasher won’t drain: 7 common causes
1. Clogged filter
The filter at the bottom of the tub catches food debris. When it packs up, water can’t get to the pump. This is the #1 cause and the easiest to fix.
2. Garbage-disposal knockout plug or clog
If your dishwasher drains into a garbage disposal, a full disposal — or a brand-new disposal whose knockout plug was never removed — will block the drain completely. This trips up a lot of homeowners after a disposal swap.
3. Clogged air gap
That little chrome cylinder on your sink is the air gap. Grease and debris clog it and back water up into the dishwasher.
4. Kinked or clogged drain hose (or missing high loop)
A pinched hose, a debris clog, or a drain hose that isn’t looped up high under the counter lets dirty water siphon back into the tub.
5. Clogged drain pump
Glass shards, seeds, or a chunk of food can jam the pump impeller so it can’t move water.
6. Failed drain pump or check valve
If the pump motor has burned out or the check valve is stuck, no amount of cleaning will help — the part needs replacing.
7. Control-board or electrical fault
Less often, the control board simply isn’t sending the “drain” signal. That’s a diagnostic job for a technician.
Safe DIY checks you can do
- Bail the standing water with a cup and towels so you can work.
- Clean the filter: twist out the cylinder filter at the tub bottom, rinse it under the tap, and clear the mesh.
- Run the garbage disposal for a few seconds — and if you recently installed a new disposal, confirm the knockout plug was removed.
- Clear the air gap: pop the cover and clean out any gunk.
- Check the drain hose for kinks behind or under the cabinet.
- Run a short rinse cycle to see if it drains now.
If water still won’t clear after these steps, stop here — the next suspects (drain pump, check valve, control board) involve disassembly and electrical work.
When to call a pro
Call a licensed technician if the pump has failed, the check valve is stuck, there’s an electrical or control-board fault, or you’ve cleaned everything and still have standing water. Spark’s licensed and insured technicians repair every major brand across San Diego County, with same-day service available when you call before noon.
Our $80 diagnostic fee is credited toward the repair when you proceed, and every job is backed by our 90-day parts-and-labor warranty — so you’re covered either way.
Brand-specific quirks
- Whirlpool & KitchenAid: the chopper/filter assembly and check valve are frequent drain culprits.
- Frigidaire: drain-pump impellers jam on debris; often shows as standing water with a hum.
- GE: the drain solenoid and hose connection at the disposal are common failure points.
- Bosch: check the drain pump and the “E24” drainage error; the filter and hose loop matter here.
- Samsung & LG: error codes (Samsung 5C/5E, LG OE) point straight to a drainage restriction or pump.
Dishwasher still won’t drain? We’ll fix it — same day in San Diego
Skip the guesswork. Spark repairs all major dishwasher brands across San Diego County — $80 diagnostic credited to your repair, 90-day parts-and-labor warranty, licensed and insured.
Call (619) 330-5105 ·
Book online
Related: Dishwasher Repair in San Diego · Appliance Repair in San Diego
Frequently Asked Questions
Why is there standing water at the bottom of my dishwasher?
Standing water means the dishwasher couldn’t push water out — most often a clogged filter, a blocked or kinked drain hose, a plugged garbage-disposal knockout, or a clogged drain pump. A cup or two of clean water in the filter area can be normal; a full pool is not.
Can I fix a dishwasher that won’t drain myself?
Often yes for the simple causes: clean the filter, clear the air gap, run the garbage disposal, and check the drain hose for kinks. If the pump has failed, the check valve is stuck, or it’s an electrical or control-board issue, that’s a job for a licensed technician.
How much does it cost to fix a dishwasher that won’t drain in San Diego?
Spark charges an $80 diagnostic fee that’s credited toward the repair if you proceed. A simple drain clog is inexpensive; a drain-pump replacement costs more. Every repair is backed by our 90-day parts-and-labor warranty.
Is a dishwasher that won’t drain worth repairing?
Usually yes. A drain clog or pump fix is far cheaper than a new dishwasher, and most units are worth repairing for the first 7 to 10 years. Our technician will tell you honestly if replacement makes more sense.
How fast can Spark come out in San Diego?
Same-day service is available across San Diego County when you call before noon. We’re licensed and insured, and you can reach us at (619) 330-5105 or book online.
Which dishwasher brands do you repair?
We service all major brands — Whirlpool, KitchenAid, GE, Frigidaire, Samsung, LG, Bosch, Maytag, Kenmore and more.
