Indosit W133 wont drain and the clicks around?

Hi there,
My washing machine stoped working while I was out of the country for a couple of months. Basically it starts washing but stops when it gets too drain. After a few days the dishwasher filed the sink up with water. The three appliances are right next to each other with the dishwasher feeding in to the pipe just under the sink. The washinh machine is feeding in to the same outlet pipe buts its behine my fitted kitchen.

I unblocked the sink and checked the u bend. i aslo ran a snake down the pipe after the ubend and put down some solution.

Now the washing machine gets to the point when its about to drain, and unlike before, it seems to take a little while before the the wheel starts clicking around.

I tied to open the filter on the washing machine but it only got so far before it would turn anymore. My mother seems to think its a coin stuck or somthing.

I have heard that this particular make of washing machine omits flashing lights to notify the user of the problem but in my case it switched on and after three flashes it stay constant before failing and flashing non stop.

I dont want to get a washing machine guy in before i establish if its a plumbing problem, and I dont want to throw a washing machine out that may only need a small part.

Any help or ideas are appreciated. I'm not very good with fixing mechanical things so please bear this in mind.

Thanks in advance.