So when you set machine going it fill up ok.
Then when it should be washing is it just makeing a wurring noise?
Is it throwing the water inside?
Ok sounds like a motor problem.
What you can try first is just replace the capaictor as sometime they fail causeing it not to wash. The capacitor is bolted onto the wash motor as these are only a few pounds.
If that doesnt work then the motor will need to be replaced. I have replaced many of these motors on bekos. They are the same machines just different names on the front
If you need anymore info just get back to me.
The chances are its the motor thats the problem.
The capacitor was just something you could try first if you wanted to.
As to getting spares you are right whirlpool made machine for diplomat but its not a normal whirlpool machine. Its a beko machine. But just click the link below for the motor for your machine. Just click the link below and scroll down to the motor.