PartsCompat UK
Diagnosis AEG

Why is my AEG dishwasher not draining?

Water pooling at the bottom of your AEG dishwasher usually indicates a blockage or pump failure. Most drainage issues can be fixed by clearing debris or repositioning the drain hose. This guide walks you through the most common causes.

Most likely causes

  • 45% Food particles and debris accumulate in the filter basket, preventing water from draining.
  • 30% The rubber hose carrying water away from the dishwasher is twisted, pinched, or clogged.
  • 15% The motor that expels water has failed and needs replacement.
  • 10% The sink drain or standpipe where your hose connects is clogged with debris.

How to diagnose it

  1. 1

    Remove the lower rack

    Pull out the bottom basket to access the filter area. This gives you clear sight of the drain hole.

  2. 2

    Unscrew and inspect filter

    Turn the cylindrical filter anticlockwise and lift it out. Look for food, grease, or foreign objects blocking the mesh.

  3. 3

    Rinse filter under running water

    Hold it under a tap and use your fingers or a soft brush to remove trapped debris. Reinstall by turning clockwise.

  4. 4

    Check drain hose routing

    Trace the rubber hose from the dishwasher to your sink or waste pipe. Straighten any kinks and ensure it sits above the sink rim if standing freely.

  5. 5

    Disconnect hose at sink end

    Unclip or unscrew the hose connector where it meets your sink. Run water through the hose to clear blockages.

  6. 6

    Clear sink outlet blockage

    Check your sink trap or standpipe for debris. Remove visible clogs with pliers or a wire coat hanger bent into a hook.

  7. 7

    Reconnect and test cycle

    Reattach the hose to the sink and run a short drain-only cycle or manual drain using your dishwasher controls. Listen for the pump motor running.

⚠️ Always disconnect your appliance from mains power before starting any repair. If in doubt, consult a qualified engineer.

FAQs

Can I use a plunger on my dishwasher?
No. Plunging risks damaging internal seals and the spray arms. Stick to clearing filters and hose blockages only.
What does it cost to replace a drain pump?
A replacement pump costs £80 to £150 including parts. Labour from an engineer adds £100 to £200.
Is standing water inside a health hazard?
Yes. Stagnant water breeds bacteria and mould. Fix drainage within 24 hours to prevent odours and contamination.