There is a plug below the floor drain. This is why when the washer drains it backs up. Soon it will start backing up when you take a bath.
The reason it got worse is the land lord knocked more debris into the plug and it is draining even more slowly.
A long power snake is the best way to clean these problems as it will get worse with time, drain cleaner may help but I wouldn’t count on it. (I say it will start backing up with a bath, this depends if the bath is on the right side of the plug).
You originally had an Asko washer/dryer matched set. This wasn't just style. The Asko washer plugged into the Asko dryer, which provided a special NEMA 6-20 receptacle on the back, specifically for an Asko washer. Why? The set is designed for high-density condos/apartments, to minimize utility hookups (no hot water, no dryer vent, no separate washer power). See page 18 of this document.
My guess is, you live in a large housing complex which found it profitable to buy the exotic Asko units to spend less on hookups. I'm also guessing you "own" rather than "rent" since a landlord would be more hands-on.
Was the electrical connection part of your buying decision? I'm sure the appliance store has sold into your housing complex before. Did they know about the peculiar Asko hookup and recommend the LG because it's compatible? If so, it should have a 6-20 outlet on the back; done.
Otherwise, aside from consumer or legal recourse against the appliance store for selling you the wrong thing, let's talk about your technical options.
Obtain a dryer that is compatible with the Asko "plug washer into dryer" arrangement. Your maintenance department may have suggestions.
Have maintenance pull a new wiring run to an additional NEMA 6-20 receptacle for the washer. This will be expensive (remember, this is why the complex spent extra on Asko units) but will give flexibility - letting you choose a wider selection of washer/dryers. (they still need to be water-heating/ventless).
Your dual-outlet solution is illegal and unsafe because the dryer could pull 30A while the washer pulls 15A. The Asko dryer was designed to share a 30A circuit with the washer it controls - the LG isn't. I suppose it might be possible to get a very large switch to power EITHER the 14-30 dryer outlet OR the 6-20 washer outlet. But insurance/liability/HOA won't let you homebrew that, you'd have to hire it done, and it'd cost as much as option 2. Plus it'd be rather "hillbilly".
Don't get adapter cables and unplug the washer and plug in the dryer every load. These large outlets are not made for frequent unplugging.
I would just ditch the dryer and hang clothesline... in the kid's room... the one who broke the dryer!
Best Answer
It sounds like your washer needs its main bearings replaced. My top load Sears Kenmore HE washer had the bearing seals fail and allowed water to get into the bearings. Over the course of a few months the washer, in high speed cycles, sounded like a freight train passing by in the next room. It was LOUD just like you are describing.
A sure fire test to check if it is the bearings is to rotate the washer tub / agitator by hand, when the washer is OFF, for a few turns. If the rotation has a grinding or roughness feeling then it is almost for sure the bearings.
I took on the repair myself and purchased the replacement parts on line for ~50$US. It also took a special tool to press in the new roller bearings. I found out that the bearings were industry standard size roller bearings (my washer used two bearings each of which was a different size) so I went to a site that sells a bit higher quality bearings with known names than the brandless import types used in the original washer. The special tool was a bit expensive at ~85$US but made the install very easy.
My suggestion is to get your washer model number and do some Google searches. When I did that I even found that the results turned up several U-Tube videos showing the steps in the bearing removal and installation.
After the new bearings were in place washer runs better than a new one. The thing is now so quiet I'm never sure just when the last load of laundry is completed.