(if no water exits hose) Many front-loaders and some top-loaders have a pump filter behind a lower access panel. Clean out lint, coins, or small clothing items.
Insert the drain snake into the standpipe. Turn the handle clockwise while pushing forward. When you feel resistance (the clog), continue turning to break it up or hook the debris. Pull the snake out and remove any caught material. Repeat 2–3 times. how to clean clogged washing machine drain pipe
Unplug the hose from the standpipe. Place the hose end into a bucket. If water flows out freely, the clog is downstream. If nothing comes out, the clog may be inside the hose or machine pump. (if no water exits hose) Many front-loaders and