When you press the drain button only cycle what happens?

@@ultimaterandomvideos i have the exact same washing machine as yours. Only had 5 months but from the very 1st day i bought it it never worked properly. It washes the clothes but the door wont open after a wash so i have to release the water manually from the pump screw. Once ive done that the door will open but clothes are wet as hell so i do 16 drain and spin and the dumb machine starts filling up with water again. I reckon its the cheapest washing machine out at £169 its only 6kg load and this is whats attributing to its poor performance.