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
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Tools You'll Need
- Multimeter
- Phillips screwdriver
- Tweezers or small pliers
How to Fix Error Code F20
-
Reset the Dishwasher
Always unplug the dishwasher or switch off the circuit breaker before any service work. -
Check for Obstructions in the Diverter Valve
-
Manually Move the Diverter Valve
Do not force the valveāit can break. If excessive force is required, stop and proceed to step 4. -
Test the Diverter Valve with a Multimeter
Ensure the dishwasher is unplugged before testing electrical components. -
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
Diverter valve
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Diverter valve
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Diverter valve
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Diverter valve
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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.