Smeg Dishwasher: not draining

Professional Repair Guide

What is this symptom?

Is your Smeg dishwasher not draining properly? If water remains at the bottom after a cycle, it could be due to a clogged filter, a blocked drain hose, or other issues. Understanding the causes can help you resolve the problem quickly.

Urgency: Medium

Important Tips for Smeg Models

  • Ensure the waste hose is correctly installed and the blanked end of the waste spigot is removed. Smeg’s official support notes this as a required condition for drainage.
  • Small glass shards can jam the magnetic impeller in Smeg drain pumps; inspect sump area carefully. (Smart Appliance Centre CC

Possible Causes

Clogged drain filter or sump area

How to Identify: Standing water after cycle; visible debris in filter at bottom of dishwasher; water drains slowly or not at all.

Part: Drain filter / sump

Kinked or blocked drain hose

How to Identify: Dishwasher not draining and drain hose behind unit appears bent, crushed, or clogged; water may back up.

Part: Drain hose

Blocked sink drain/air gap or garbage disposal blockage

How to Identify: Dishwasher drains to sink line and sink drain or air gap is blocked; water backs up into dishwasher; disposal clogged.

Part: Garbage disposal / air gap / sink drain connection

Faulty or jammed drain pump impeller

How to Identify: Humming noise during drain cycle with no water removed; debris such as glass found near pump; impeller does not spin freely.

Part: Drain pump (impeller)

Control or sensor/electronics fault (error codes)

How to Identify: Dishwasher displays an error code related to drainage (e.g., E06 or fails to initiate drain cycle despite clear hoses and filters.

Part: Control board / water level sensor

DIY Solutions

Clean the drain filter and sump

Easy 10-20 minutes
Tools Needed: gloves, towel
  1. Turn off and disconnect power to dishwasher.
  2. Remove lower rack and locate the drain filter at the bottom.
  3. Unscrew or lift out the filter and surrounding parts and rinse under warm water to remove debris.
  4. Wipe sump area and replace filter securely.
  5. Run a short rinse cycle to test drainage.
⚠️ Safety First: Always disconnect power before removing filters.

Inspect and clear the drain hose

Moderate 20-40 minutes
Tools Needed: screwdriver, bucket, flashlight, plumber’s snake or long brush
  1. Pull dishwasher away from cabinet to access back.
  2. Inspect drain hose for kinks or bends; straighten hose if needed.
  3. Disconnect hose at both ends (dishwasher and sink/disposal).
  4. Flush hose with water and use brush or snake to clear any blockages.
  5. Reconnect hose with correct high‑loop installation and secure fittings.
  6. Run a test cycle.
⚠️ Safety First: Place towel or bucket to catch water when disconnecting hose.

Clear sink drain/air gap or garbage disposal connection

Moderate 15-30 minutes
Tools Needed: screwdriver, brush, bucket
  1. Check sink air gap (if present) for debris; remove and clean internal hose.
  2. Run garbage disposal to clear blockages under sink.
  3. Disconnect dishwasher drain hose from disposal and flush connection area.
  4. Reattach properly and check drain operation.
⚠️ Safety First: Turn off disposal power before working on it.

Professional Repairs

Replace faulty drain pump

Estimated Cost: $80 - $250

Diagnose control/electronics or sensor faults

Estimated Cost: $150 - $400

When to Call a Professional

If pump motor is silent or making unusual noises and DIY cleaning doesn’t fix the issue
Persistent error codes after basic troubleshooting
Visible damage to hoses or components that cannot be safely repaired by homeowner

Preventive Maintenance

  • Clean drain filter: Filter clogs that lead to drainage problems
    Frequency: monthly
  • Inspect drain hose: Hose kinks or blockages that impede proper drainage
    Frequency: annually

Frequently Asked Questions

Why is my Smeg Dishwasher not draining?
Common causes include a clogged drain filter, a kinked drain hose, or blockages in the sink drain.
How do I fix Smeg Dishwasher not draining myself?
You can clean the drain filter, inspect the drain hose for kinks, or clear any blockages in the sink.
How much does it cost to fix not draining?
Professional repairs can range from $80 to $250 for a drain pump replacement.
When should I call a technician for not draining?
If DIY fixes don't work or if you suspect control or electronics issues, contact a technician.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

50%
DIY Success Rate Difficulty: Either

Common Issues Reported by Users

  • Possible water leak causing pump to malfunction (1 mentions)
  • Flood condition triggering flood mode (1 mentions)

User Suggested Solutions

  1. Check for water leaks that may cause pump malfunction

    Success rate: 50.0%

  2. Inspect for flood condition and reset the flood mode

    Success rate: 50.0%
Analysis based on 2 community discussions
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. Smeg stu8649x dishwasher Error.
  2. Dishwasher noises when not running

Community Discussions

making noises like it was running/draining but it wasn’t on

The dishwasher may have triggered a flood condition, entering flood mode and draining continuously.

DIY View on Reddit →

loud humming noise when powered on, error 'E' pops up

Possible water leak causing pump to malfunction

Pro needed View on Reddit →

Source: Reddit r/appliancerepair

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