With the filter out, the best way to check is to take the drain hose out or off of the house drains.
Clean the end of the hose and then blow as hard as you can back down the drain hose.
If it's blocked with scale, you'll likely need to replace it or clean it out.
If you can blow through it, refit the filter.
Lift the drain hose up so it's as high as the top of the machine.
Put some water into the drum using a jug (you only need a litre or 2 to test the machine).
Aim the drain hose into a bucket.
Switch the machine onto a drain only or spin only programme.
If it pumps the water out, it's working.
if it doesn't, you have a blockage.
Let me know how it goes.