Asko Dishwasher Error Code F20: How to Fix It

Medium 30-60 minutes Medium Severity Verified June 2026
Error Code
F20
Brand
Asko
Product Type
appliance
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
30-60 minutes
Error code F20 on your Asko dishwasher indicates a mechanical problem with the diverter valve, which directs water to the correct spray arms. This often means the valve is stuck or jammed, preventing proper wash cycles. Follow these steps to diagnose and fix the issue yourself.
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Tools You'll Need

How to Fix Error Code F20

  1. Reset the Dishwasher

    Always unplug the dishwasher or switch off the circuit breaker before any service work.
  2. Check for Obstructions in the Diverter Valve

  3. Manually Move the Diverter Valve

    Do not force the valve—it can break. If excessive force is required, stop and proceed to step 4.
  4. Test the Diverter Valve with a Multimeter

    Ensure the dishwasher is unplugged before testing electrical components.
  5. Replace the Diverter Valve (if faulty)

    Take photos during disassembly to help with reassembly. Double-check that all connections are secure.

Parts You May Need

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When to Call a Professional

If the error persists after replacing the diverter valve, the issue may be with the control board or wiring harness. Contact a qualified technician for further diagnosis.

Frequently Asked Questions

What does error F20 mean on an Asko dishwasher?
Error F20 indicates a mechanical problem with the diverter valve, which controls water flow to the spray arms. It usually means the valve is stuck or jammed.
Can I reset my Asko dishwasher to clear error F20?
Yes, turn off power for 5 minutes and then restart. If the error returns, you likely have a mechanical issue that needs fixing.
Where is the diverter valve on my Asko dishwasher?
The diverter valve is typically located under the filter assembly, near the bottom of the dishwasher. You may need to remove the lower spray arm and filter to access it.
Do I need to replace the diverter valve for error F20?
Sometimes debris can be cleared without replacement. However, if the valve is stuck or faulty (check with a multimeter), replacement is usually necessary.
Can a blocked drain cause error F20?
No, F20 is specific to the diverter valve, not the drain system. A blocked drain usually triggers a different error code.