Why does it back up in every load washing?

Question

the drain is not clogged. everything drain perfect excepted for washer. when it go in spin cycle to drain water it come up in my dishwasher and kitchen sink. the hoes for washer is the size it need to be . it goes up the pipe to make a half loop over then down toward floor against the wall and stop about 2 inches of the floor into the wall where it connected to kitchen sink pipes and all them pipes are same size, with all three running, going same way, all three drain no problem . no plug, no backup, no dirty water sitting anywhere. the washer water go before sink and dishwasher water drain. with just washer why does it drain dirty water into my dishwasher leaving about 3/4 of water on bottom noy draining that at all and at the same time it come up my kitchen sink ,filling it about 1/4 of the sink up then goes down as if I pulled the sink stopper out. drain pretty good but what about my dishwasher?

Answer 1

While you say the drain is not clogged, the situation you describe says otherwise.  You may have a "partial" clog.  The volume of water that is being drained from the washer is backing up in the line because it cannot flow away fast enough.  Try putting a good drain cleaner down the washer outlet pipe and see what happens.

Answer 2

There seems to be a blockage in your pipework somewhere.?

Check all your hoses and the ubend in the waste pipe.