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Plumbed in New Washer, Drain water is backing up into sink!
I just plumbed in a new washing machine into our office closet, which backs our bathroom. There was previously a washer and dryer in there but the previous owners removed it and unhooked the drainage pipes. We plumbed in new ones today, and every time the washer drains, the water that drains from the washer backs up into our bathroom sink (fills the sink about half way) attatched is a crappy drawing of how we have plumbed it in... is there something wrong with the way we plumbed it? Or could one of my lines be partially clogged causeing the back flow? All the pvc piping is 1" 1/4 and is slightly slanted towards the floor from the sink, how it is suppose to be. I should probably install a p trap somewhere in the washer drain pipe to prevent sewer gases from coming into the house right? Is there something wrong with how I plumbed this in causeing it to backup to bathroom sink? Or could my pipes be slightly clogged causing the back pressure? Thanks for looking, and any help/advice is greatly appreciated! Thanks again!