My KitchenAid washing machine wants to overflow out of the drainage pipe onto my floor when I do a load of laundry. I've tried putting drain declogger in the pipe. When I fill the washer with hot water to flush the declogger/clog out, the water flows out with no problem at all; however, when I do a load of laundry (using cold water) the drain still overflows (even after draining with no problem using hot water). I do not understand this at all. I tried a washing a load of whites using hot water and it overflowed. What is wrong with this picture. Any help would be greatly appreciated.

My KitchenAid washing machine wants to overflow out of the drainage pipe onto my floor when I do a load of laundry. I've tried putting drain declogger in the pipe. When I fill the washer with hot water to flush the declogger/clog out, the water flows out with no problem at all; however, when I do a load of laundry (using cold water) the drain still overflows (even after draining with no problem using hot water). I do not understand this at all. I tried a washing a load of whites using hot water and it overflowed. What is wrong with this picture. Any help would be greatly appreciated.
Over two years ago I purchased a new Kenmore washer with a drain overflow problem. The old washer (only 5 years old) drained fine. Our drain pipe was 2 inches. We thought it was a clogged drain, but it wasn't. We had to temporarily have the gray water exit through the window. Yesterday it dawned on me that the old washer drain hose had a hard plastic "U" where it went into the wall drain pipe; the new hose did not. I went to the store and purchased a new hose with a "U" in the end. Evidently, besides helping the hose stay in the drain pipe, the "U" slows down the waterflow. PROBLEM SOLVED!