try looking into youtube. or even not doing as needed or as it should be done if you don't get it to work let me know I must remove all tray and water tank to make thing work will look into it for you some systems don't work that simple
at the back of the water tank which is inside the tank, there should be a floater that will correspond to the internal PCB commands or if you like sensor. if what is full floater should go up if the water is low floater is down.
you probably have used the machine without water and not you have an airlock in the system .you will have to try flushing the system only on the cold side to help the machine to work but you have to use it few seconds at a time to avoid for over haeting the water pump.
you will have to open the machine cover to fix it if it's automatic don't try to use it. it will only make thing wors do not use a capsule with any dents at the back of it the piston will break everything
you may have to pull up very slowly the handle as it may be that the capsule is stuck or even broken if you pull the handle hard you will brake the piston
it seems to be the problem is in the valve or if you like to call it solenoid valve. this can stop the operation from doing as expected if you have a water filter remove it to avoid any blockage.