HOTPOINT WDM73 WASHER/DRYER not finishing spin cycle

[GMAN2017]

Hi Guys,
i'm a newbie to this site. Hopefully someone can help. I've got a Hotpoint WDM73 washer/dryer. The problem is the machine isn't finishing the spin cycle, this means the door stays locked. I've switched the machine off and unplugged for 30 mins then just done a 1200 (high) spin only. The machine does spin I don't think it's finishing the full cycle as when it stops the display still says 'SPINNING' the display also shows the lock symbol so I can't open the door either. This is an old machine I know and has been great. Would like to fix this if possible. Hopefully someone can help.

 

[jj4091]

Motor brushes?

 

[Echo the husky]

Blocked pressure switch pipe, making the machine think it is still full of water, so it won't let you open the door?