New washer overflows drain pipe
I replaced an old washing machine that drained with no problem into my wall drain pipe. When the new washer was hooked up, the drain pipe could not handle the volume of water and overflows. If I put the washer on slow setting, it drains fine.
I had a plumber out to check and see if I had any clogs. He confirmed there were no clogs. He did, however, state that the newer washing machines drain much faster than the old ones and older plumbing drain pipes cannot handle the water flow. Apparently, new building codes require larger drain pipes now.
Any suggestions for how to fix this problem? I just leased my house to a new tenant who doesn't have a slower speed setting on their washer. Any help would be appreciated.