Dishwasher Not Draining Completely — Partial Drain vs No Drain Explained

Author: Safro Solutions Appliance Repair Team | Los Angeles, CA

You open the dishwasher after a full cycle. Water is still sitting at the bottom.

Before you panic or start pulling things apart — this is one of the most common calls we get at Safro Solutions. And here’s what most guides skip: a dishwasher with a little water left behind is a completely different problem from one that won’t drain at all. Different causes. Different fix. Different urgency.

This guide tells you exactly which one you have and what to do next.

Quick Answer: Water ¼ inch or less after a cycle is normal — dishwashers keep a small amount by design to prevent seals from drying out. Water above ½ inch means something is blocking drainage. The #1 cause is a dirty filter, which takes 10 minutes to clean. If that doesn’t fix it, the drain pump likely needs a technician.

There’s Water at the Bottom of My Dishwasher — Is That Normal?

Yes, a small amount is completely normal. Dishwashers intentionally hold a thin film of residual water after every cycle to keep the door gasket and pump seals from drying out. The problem starts when that amount grows over time.

Quick test: After a completed cycle, touch the tub floor. If water doesn’t reach your first knuckle — you’re fine. If it does — something’s blocking drainage.

What’s the Difference Between “Some Water Left” and “Won’t Drain at All”?

Most guides treat these as the same problem. They’re not.

“Some water left” (Partial Drain) The cycle finishes normally. An inch or two of water sits at the bottom. Dishes are clean. No error code. This probably started weeks ago and slowly got worse.

→ Most likely a dirty filter or a slow drain hose. Usually DIY-fixable in 15 minutes. → Fix within 1–2 weeks — it won’t cause immediate damage, but standing water creates smell and speeds up wear.

“Won’t drain at all” (No Drain) The tub is nearly full. The cycle may have stopped partway through. An error code is showing. This probably happened suddenly.

→ Could be a fully blocked filter, kinked hose, failed pump, or a new garbage disposal with a plug that was never removed. → Fix today — running more cycles with a completely blocked drain risks burning out the pump motor.

Why Is My Dishwasher Not Draining Completely?

The filter is dirty — and this fixes it most of the time

The filter catches food and debris before it reaches the pump. Over time, grease and food particles coat it until water can barely pass through. This is the cause in roughly 70% of partial drain cases.

You’ll know it’s the filter if: The problem builds up gradually, the cycle still finishes, and the water left behind looks slightly cloudy.

How to actually clean it (most people just rinse it — that’s not enough):

1. Pull out the bottom rack
2. Twist the cylindrical filter counterclockwise and lift it out — grab the flat mesh screen underneath too
3. Scrub both under hot running water with an old toothbrush
4. If there’s white chalky buildup, soak in 50/50 white vinegar and water for 15 minutes — that’s mineral scale from hard water
5. Check the cavity where the filter sits and clear any debris sitting there
6. Reinstall by twisting clockwise until it clicks

Run a test cycle. If it drains — you’re done.

Time: 10–15 minutes.

If you’re in the San Fernando Valley or anywhere in LA: Your water runs 350–500 ppm of dissolved minerals — the LADWP Water Quality Report puts most of the Valley in the “very hard” range. That’s why your filter gets gunky faster than the guides say it should. Most guides say clean monthly. In Encino, Sherman Oaks, Van Nuys, Woodland Hills — every two weeks is the right schedule.

Could the hose under my sink be the problem?

The drain hose runs from your dishwasher, loops up inside the cabinet (this arc is called the “high loop”), then connects down to your garbage disposal or sink drain. If it sags, kinks, or gets clogged internally, drainage slows or stops.

You’ll know it’s the hose if: The problem appeared after the dishwasher was moved, or after plumbing work. The pump sounds like it’s running but nothing’s happening.

What to check: Open the cabinet under your sink. Look for the hose. Is it kinked? Is it still looping upward before going down, or has it sagged? Straighten any bends and push the high loop back up if it’s dropped.

LA note: After 7–10 years in hard water, mineral scale builds up inside the hose walls even when it looks fine outside. If the dishwasher is that old and the hose has never been replaced, it may be narrowed internally. Disconnect it from the disposal and flush water through it to check flow.

Run a test cycle. If it drains — done.

Time: 5–10 minutes.

Does running my garbage disposal actually matter?

Yes, more than most people realize. In most LA kitchens, the dishwasher drain runs through the garbage disposal. A full or sluggish disposal creates backpressure that sends water back into the dishwasher instead of out.

Simple habit: Run the disposal for 30 seconds with cold water before you start every dishwasher cycle.

One specific thing to check on new installations: If your garbage disposal was recently replaced, there’s a knockout plug inside the drain inlet that has to be removed before the dishwasher connection works. Installers sometimes miss this. If drainage was completely fine until a new disposal went in — that plug is almost certainly the cause.

Time: 2 minutes.

What about that chrome thing next to my faucet?

That’s an air gap — not every kitchen has one, but if yours does, it can clog. Its job is to stop dirty water from siphoning back into the dishwasher. When it’s blocked, drainage gets restricted.

You’ll know it’s the air gap if: Water spurts out of that chrome cylinder during the drain phase of the cycle.

Fix: Unscrew or pop off the cap, remove the plastic inner piece, clear the small port with a toothpick or small brush, put it back, run a test cycle.

Time: 5 minutes.

How do I know if my dishwasher’s drain pump is bad?

This is the part where DIY ends. The drain pump is the motor that pushes water out. When it fails, you’ll hear it humming during the drain cycle — but nothing moves. Or it works some days and not others, with no pattern.

Signs that point to the pump:

• Humming sound but no water draining
• Works fine sometimes, fails randomly
• You’ve cleaned the filter, checked the hose, run the disposal — still nothing
• Dishwasher is 7+ years old

⚠️ Don’t attempt the pump yourself. You need diagnostic tools to confirm it’s actually the pump and not the control board or wiring. Getting it wrong means buying the wrong part and still having a broken dishwasher. According to Consumer Reports, pump lifespan is noticeably shorter in hard-water areas — which includes most of Los Angeles.

My Dishwasher Is Showing a Code — What Does It Mean?

Error codes are a starting point, not a final diagnosis. The same code can come from three different causes. Always clean the filter and run a test cycle before assuming you need a part.

LG’s official drain guide and Samsung’s support page have brand-specific steps if the code keeps returning after filter cleaning.

How Do I Actually Fix It? Start Here.

1. Scoop out the standing water — Use a cup, absorb the rest with a towel. You need to see the tub floor. (5 min)
2. Hold the Cancel button for 3 seconds — Most models trigger a drain-only cycle this way. Does the pump hum but nothing moves? That’s a pump warning sign. (2 min)
3. Scrub the filter — Twist it out, scrub with a toothbrush under hot water, check the sump cavity below it, reinstall. Run a test cycle. → Water drained? Done. (10–15 min)
4. Check the hose under the sink — Look for kinks, confirm the high loop is still arcing upward, straighten anything bent. Run a test cycle. → Water drained? Done. (5–10 min)
5. Run the garbage disposal — 30 seconds with cold water. Run a test cycle. → Water drained? Done. (2 min)
6. Clean the air gap if you have one — Remove cap, clear the port, reinstall. Run a test cycle. → Water drained? Done. (5 min)
7. Still not draining? Stop running cycles and call a technician. Every cycle you run with a fully blocked drain adds stress to the pump motor. 

I’ve Tried Everything — When Should I Just Call Someone?

Try the steps above if: Cycle finishes, 1–2 inches of water remaining, no error code, no leaking, gradual problem.

Call a technician now if:

• Pump hums but nothing drains
• Error code comes back right after filter cleaning
• Water is on the floor or inside the cabinet below
• Problem appeared overnight — not gradually
• Dishwasher is 8 years old or more
• Went through all 7 steps and it still won’t drain

What It Costs in Los Angeles (2026)

Ranges based on HomeGuide 2026 national data — LA labor rates typically land at the higher end.

How Do I Stop This From Happening Again?

LA’s hard water — defined as “very hard” by USGS standards for most of the San Fernando Valley — is the single biggest reason dishwashers in this area clog faster than anywhere else in the country. Calcium and magnesium deposits build up in your filter, hose walls, and pump much faster than in soft-water cities.

Still have standing water after trying everything?

Safro Solutions handles same-day dishwasher repair across Los Angeles for LG, Samsung, Whirlpool, GE, KitchenAid, Bosch, and Maytag.

📞 Call 747-250-6879 · 🌐 Schedule online

Serving Valley Village · Sherman Oaks · Studio City · Burbank · Encino · Beverly Hills · Tarzana · Woodland Hills · Van Nuys · Northridge

Written by the Safro Solutions technician team — licensed appliance repair specialists serving Los Angeles for 5+ years. See our dishwasher repair service 

Frequently Asked Questions

Q1: Is some water in my dishwasher after a cycle normal? 

Yes — ¼ inch or less is by design. Dishwashers hold a small amount to keep door seals moist. Water above ½ inch after a completed cycle means the drain path is restricted, almost always starting with a dirty filter.

Q2: Why is my dishwasher leaving water but still cleaning dishes?

A partially clogged filter restricts flow without stopping it completely — the cycle ends before all the water has drained through. Scrub the filter with a brush (not just rinse it) and run a test cycle. This fixes it most of the time.

Q3: My LG dishwasher shows OE — do I need a new pump?

Not necessarily. OE fires whenever the drain cycle takes too long — which can still be a dirty filter, not a pump. Clean the filter first. If the code comes back, check the drain hose. If it persists after both — then call a technician. Call Safro Solutions at 747-250-6879.

Q4: How much does dishwasher drain repair cost in Los Angeles?

Filter and hose fixes run $100–$160. Drain pump replacement costs $220–$420. Safro Solutions charges $89 for a diagnostic — waived when you proceed with repair.

Q5: Can I just run another cycle to see if it clears itself?

If water is partially draining, one more cycle is unlikely to help and just adds wear. If the tub is completely full, don’t run another cycle at all — the pump is already working against a full blockage and can overheat.