As you have already tried cleaned etc even cleaned the filter and even tried dishwasher cleaners however, nothing helped in resolving the issue.
Select an empty wash cycle on its hottest setting.
Let it complete and then wait for around 1 hour before opening the door.
Clean the drain pump filter then clean the drain hose and make sure nothing is clogged.
Then leave it unplugged for few hours with door open.
You may then try and see if it works.
If the problem is still there I am afraid the circulation wash pump motor is faulty and will need replacement.
The part is available here for £80 + repair charges.
If you have any further questions, please do not hesitate to ask!
If you are satisfied with my assistance, your 5 STAR Rating (from top of this page) at this time is appreciated. Thank You!