Dishwasher Not Draining

Why Your Dishwasher Is Not Draining

If your dishwasher is not draining, the most likely causes are a clogged drain filter, a blocked or kinked drain hose, or a failing drain pump. Start by cleaning the filter — it resolves the majority of standing water complaints and takes under five minutes.

Standing water at the bottom of your dishwasher after a cycle is one of the most common dishwasher problems. This issue is often related to a clogged filter, a blocked drain path, or a tight under-sink installation. In most cases, the fix is straightforward — but some causes require a technician.

Most Common Causes

1. Clogged Drain Filter

The drain filter traps food debris during the wash cycle. When it gets clogged, water cannot pass through to drain.

How to check:

• Remove the bottom rack
• Locate the filter assembly at the bottom of the tub (usually a twist-and-lock cylinder)
• Remove and rinse under warm running water
• Use a soft brush to clear any stuck debris
• Reinstall and run a short cycle

This is the most common cause — and the easiest fix.

2. Blocked Drain Hose

The drain hose connects your dishwasher to the sink drain or garbage disposal. A kink or clog in this hose prevents draining.

Tight cabinet space can make hose kinks more common.

How to check:

• Inspect the hose under the sink for visible kinks
• If you have a garbage disposal, ensure the knockout plug was removed when it was installed
• Run your disposal before running the dishwasher — a clogged disposal blocks dishwasher drainage too

3. Faulty Drain Pump

The drain pump pushes water out of the tub. If it fails, water stays inside.

Signs of a pump problem:

• You can hear the dishwasher trying to drain but water stays
• The pump hums but nothing drains
• No sound from the drain at all

A failed drain pump requires professional repair.

4. Blocked Air Gap (if installed)

Some dishwashers use an air gap fitting on the sink — a small chrome dome next to the faucet. This can get clogged.

How to check:

• Remove the chrome cap and plastic cover from the air gap
• Clear any visible blockage
• Run the dishwasher again

5. Garbage Disposal Issue

If your dishwasher drains through a garbage disposal:

• Run the disposal to clear any food build-up before running the dishwasher
• If the disposal was recently installed, confirm the drain knockout plug was removed

Step-by-Step Troubleshooting

1. Clean the drain filter (start here — resolves the issue in most cases)
2. Run the garbage disposal if connected
3. Check the drain hose for kinks under the sink
4. Inspect the air gap if your setup has one
5. Run a short test cycle and observe

If water still doesn't drain after these steps, the pump or a control board issue is likely involved. If the unit also fails to begin cycles, see our guide on dishwasher not starting.

Error Codes to Watch For

| Code | Common Meaning | |------|---------------| | OE / E24 / E25 | Drain error — check filter and hose first | | F8 E4 | Drain pump issue |

Refer to your appliance manual for brand-specific codes.