UK Appliance Repair Questions? Ask a Technician for Answers ASAP
First thing to do is to check the motor brushes ~ Ian
If you find that they are OK then (and I see that you have replaced them but check that they are loose in the holders and can move in and out without sticking) you likely have a damaged motor that needs replacing. Much more likely than a motor controller.
OK I need you to run the appliance in spin whilst keeping an eye on the motor and then tell me if you can see any arcing of the motor in the brush area. It may well be that the armature on the motor is now faulty.
Give me the full ENr for the appliance, its in the door recess and then I can look up the info
Could you recheck that ENr please ~ its not listed on my data base.