washing machine door?

A motor problem could give a door fault . Try here http://home-appliance-diy.co.uk/motors-welded/ .Check the brushes if fitted.

Neil
August 2016

My idea is that there is something wrong with the door.
I do not think that there's anything wrong with the filter.

Good Luck...
July 2016

start button keep telling you door.

Door...........WHAT?

If it it telling you door not locked or door not closed, maybe its a problem with the catch or the switch in the catch which senses the door is closed & locked.

Why not do a Google search for "make model door lock" - replaving "make" and "modek" with your own info

Anon
July 2016