Hello, welcome to FixYa.
On these Asko the drain pump operation can be very deceiving, appearing to operate (the impeller may even spin) yet cannot pump out the water...I've change many of these pumps for this reason, it is quite common in my experience.
If you have, as you mentioned insured all lines are clear and free of obstructions, you'll have to replace the pump. Here's what Asko has to say about these pumps...
**Drain pump
The drain pump consists of a synchronous motor with an output of 30 W and a pump impeller. The direction of rotation is random, which makes it partially self-cleaning.**
this by nature (the synchronous design specifically) makes them vulnerable to failures though it appears to operate...It cannot pump once the volume of water is present.
The original part number replacement is # 8078089 and usually retail for around $50.00US.
Here is a link that should work for identification and ordering information for the drain pump assembly.
http://www.repairclinic.com/PartDetail/Drain-Pump/8078089/1488933
Let me know if I can assist you in any manner going forward. Good luck. and Thank you for choosing FixYa.
Regards,
Macmarkus :)
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