Dishwasher Not Draining? How to Fix It
1. Diagnose: What's Happening?
| Symptom | Likely Cause | Fix |
|---|---|---|
| Water sits below the filter, cycle finishes normally | Clogged filter or drain path | Clean filter — free |
| Humming/grinding when draining, water stays | Drain pump jammed or failing | Check pump / call tech |
| New garbage disposal installed recently | Knockout plug still in disposal inlet | Remove plug — free |
| Drains partially then stops | Kinked or clogged drain hose | Check hose — free |
2. Fix #1: Clean the Filter (10 Minutes, Free)
This fixes most cases. The filter catches food debris and gets clogged over time.
- Unplug the dishwasher or turn off the breaker.
- Remove the bottom rack.
- Twist out the filter assembly at the bottom center of the tub. It usually turns counterclockwise.
- You'll see gunk, grease, and food particles — that's your blockage.
- Rinse under hot water and scrub with a soft brush until the mesh is clear.
- Check the sump (the hole under the filter) for debris like glass, labels, or bones.
- Reinstall the filter, restore power, run a short cycle.
3. Fix #2: Check the Drain Hose
- Open the cabinet under the sink and find the dishwasher drain hose (ribbed plastic tube).
- Check for kinks — straighten any bends.
- Disconnect the hose and run water through it. It should flow freely.
- If clogged, flush it out with hot water or replace it (~$10).
4. Fix #3: Garbage Disposal Knockout Plug
If you recently installed a new garbage disposal and the dishwasher stopped draining, this is almost certainly the cause.
- Disconnect the drain hose from the disposal inlet.
- Look inside the disposal inlet — you should see an opening. If it's sealed with a plastic disc, that's the knockout plug.
- Use a screwdriver and hammer to knock it out from inside the disposal.
- Remove the knocked-out plug from inside the disposal (reach in with pliers, NOT your hand while it's connected to power).
- Reconnect the hose and test.
Cleaned the filter but still not draining?
It might be the drain pump. Describe the issue to homemd.ai and it'll tell you if it's a simple fix or time to call a tech.
Get Your Free Diagnosis5. Products and Parts
Affresh Dishwasher Cleaner Tablets — ~$7 (monthly maintenance) — View at Home Depot
Universal Dishwasher Drain Hose — ~$10 (if current hose is damaged) — View at Home Depot
6. Cost Breakdown
| Option | Cost | Time |
|---|---|---|
| DIY — Clean filter / check hose | $0 | 15–30 min |
| DIY — Replace drain hose | $10 | 30 min |
| Repair tech — Drain pump | $150–$300 | Same day |
7. When to Call a Repair Tech
- Filter and hose are clear but still won't drain (drain pump is likely bad).
- You hear a humming sound during the drain cycle but no water moves.
- Error codes on the dishwasher display.
- Water is leaking from underneath the dishwasher.
FAQ
Is standing water in a dishwasher normal?
A small amount (less than 1 inch) in the sump area can be normal — it keeps the seals moist. More than that, or water covering the filter, means a drainage problem.
Can I use Drano in my dishwasher?
No. Chemical drain cleaners can damage dishwasher components and leave toxic residue on your dishes. Stick to cleaning the filter and hose manually.
How often should I clean my dishwasher filter?
Once a month. Run an empty cycle with a dishwasher cleaner tablet (Affresh or Finish) every 1–2 months for maintenance.
Watch: Dishwasher Not Draining - Drain Pump Replacement
Frequently Asked Questions
Why is there standing water in the bottom of my dishwasher?
Most commonly: a clogged drain filter (clean it), a kinked drain hose, or a blocked garbage disposal knockout plug. The drain filter is under the bottom spray arm and can be unscrewed and cleaned in 5 minutes.
How much does a plumber charge to fix a dishwasher that won't drain?
A plumber or appliance tech charges $150 to $300. Cleaning the drain filter yourself is free and fixes the problem 60% of the time.
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