Asko · Dishwasher

20

Drain Fault

Severity

High

The error code 20 on your Asko Dishwasher indicates a specific system failure categorized as "Drain Fault". This guide walks you through the most likely causes and the correct repair sequence.

Owner's Summary

Your Asko dishwasher's drain system is blocked. Asko machines are high-quality Scandinavian appliances with a similar filter-first diagnostic approach — clean the filter before assuming the pump has failed.

Symptoms

Asko dishwasher not draining, fault code 20 displayed

Common Causes

Clogged filter and drain pump area
Drain hose blocked or kinked
Drain pump motor failure
Drain pump impeller jammed by foreign object

How to Fix

1 Remove and clean all filter components
2 Check drain hose for kinks under the counter
3 Manually spin pump impeller to check for blockage
4 Replace drain pump if motor fails resistance test

Tools You'll Need

Multimeter Pliers Soft Brush Towels / Bucket

Most of these fixes need only basic hand tools. If your repair requires opening electrical housings or testing live components, a multimeter and basic electrical safety knowledge are essential — when in doubt, call a technician.

Technical Explanation

Asko uses a numeric fault code system. Code 20 indicates the drain pump ran but the sump water level sensor confirmed water is still present above threshold after the allotted drain time. The control module logs code 20 and halts further operation.

Is It Safe to Keep Using?

Fix same day to prevent mold and hygiene issues.

Technician's Pro Tip

Asko dishwashers have a particularly fine sump filter that traps small food particles effectively but clogs faster than coarser filters on other brands. Clean the Asko filter every two weeks if you wash heavily soiled loads frequently.

Related Codes

E1 — Samsung Dishwasher

Water Supply Error

High

E2 — Samsung Dishwasher

Water Temperature Too High

Medium

E3 — Samsung Dishwasher

Water Not Heating

Medium

Frequently Asked Questions

What does error code 20 mean on a Asko Dishwasher?

Code 20 on a Asko Dishwasher indicates "Drain Fault." In practice, the most common trigger is clogged filter and drain pump area. Severity is rated high, and typical repair costs range from $0 to $250.

Can I fix 20 myself, or do I need a technician?

Many cases of 20 can be resolved without a technician. The first step to try: remove and clean all filter components. If that doesn't clear the code, work through the remaining steps in the "How to Fix" section above before assuming a part needs replacing.

Is it safe to keep using my dishwasher with code 20 showing?

Fix same day to prevent mold and hygiene issues.

How much does it cost to repair 20 on a Asko Dishwasher?

Repair costs for code 20 typically range from $0 to $250. Filter cleaning: $0; Drain pump: $80–$250 + labor. Costs on the low end usually reflect a DIY fix with no parts required, while the high end reflects a part replacement plus professional labor.

Estimated Repair Cost USD

$0 – $250

Filter cleaning: $0; Drain pump: $80–$250 + labor