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Sub-Zero Repair Dover
Expert Appliance Repair
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Dishwasher Not Draining

Standing water in your dishwasher after a cycle indicates a drainage problem that needs attention.

dishwasher

Symptoms

  • Standing water at bottom after cycle
  • Water backs up during cycle
  • Dishes remain dirty due to dirty water
  • Foul odor from standing water
  • Dishwasher stops mid-cycle

Possible Causes

Clogged filter

common

Food debris has accumulated in the drain filter.

Blocked drain hose

common

The drain hose is kinked, clogged, or improperly installed.

Garbage disposal connection

common

The disposal knockout plug was not removed, or disposal is clogged.

Drain pump failure

occasional

The pump that forces water out has failed.

Air gap or high loop issue

occasional

Improper drain configuration allows backflow.

Diagnostic Steps

  1. 1Remove the filter and inspect for debris
  2. 2Check if the garbage disposal drains properly (run it)
  3. 3Inspect the drain hose for kinks
  4. 4Listen for the drain pump during the drain cycle
  5. 5Check for error codes on the display

DIY Fixes

Clean the drain filter

easy

Steps:

  1. 1.Remove the lower rack
  2. 2.Locate the filter assembly at the bottom
  3. 3.Twist and lift to remove the filter
  4. 4.Rinse under running water
  5. 5.Use a soft brush to remove stuck debris
  6. 6.Check the sump area for debris
  7. 7.Reinstall the filter securely

Tools needed:

Soft brushPaper towels

Warnings

  • Check for broken glass before reaching into sump

Check garbage disposal connection

easy

Steps:

  1. 1.Run the garbage disposal to clear it
  2. 2.Check if a new disposal still has the knockout plug in place
  3. 3.If so, remove the plug from inside the disposal
  4. 4.Run water through disposal to verify drainage

Tools needed:

Screwdriver (for knockout plug if needed)

Warnings

  • Never put hand in disposal - use tools only

Inspect drain hose

moderate

Steps:

  1. 1.Pull dishwasher out slightly (disconnect power first)
  2. 2.Locate drain hose connection at disposal or sink drain
  3. 3.Check for kinks or clogs
  4. 4.Ensure hose has a high loop under counter (prevents backflow)
  5. 5.Disconnect and blow through hose to check for clogs

Tools needed:

ScrewdriverPliersTowels

Warnings

  • Have towels ready for water
  • Disconnect power before moving dishwasher

When to Call a Professional

  • Filter cleaning does not resolve the issue
  • Drain pump is not operating
  • You cannot access or clear the drain hose
  • Error codes indicate pump or motor failure
  • Problem persists after troubleshooting

Prevention Tips

  • Clean the filter monthly
  • Scrape dishes before loading (do not rinse)
  • Run garbage disposal before starting dishwasher
  • Run hot water at sink before starting cycle

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