Washing machine lint

fluffed up,

If you have a manual filter..make sure it's clean. If you do, and it is, the tub drain could be blocked.( it is under the agitator and basket, requires disassembly) If you don't have a manual filter, the self-cleaning filter/ trap could be clogged.(it is underneath, also requires some disassembly. If you have tools and feel comfortable with things mechanical, get a repair manual from the library, maybe you can tackle the fix.

hope this helps,
handiman518