I have a Delonghi Magnifica Esam 4200 and the grinder makes a strange loud noise but no coffee is ground. After this the red light to indicate that waste tray is full comes on and no coffee comes out.

SOURCE: water container full but low indication on

I think the water level is read by a magnetic pick up driven by a black floater located 3/4 way towards the back of the water tank.
Make sure this floater can move up and down in its pocket: you can see it through the walls so just shake the tank to see it move, and check that it floats up when you fill water

SOURCE: Coffee machine Delonghi Magnifica grinding function not working

There are two reasons for this usually. Either the grinder is jammed or the grinding wheel or wheels have broken. Your machine needs to go to a repair shop to be looked at.

SOURCE: descaling a delonghi magnifica ESAm04

I had this problem too. The instruction manual says to turn the steam knob only half way counter-clockwise after pressing the button for 5 seconds, but you need to turn it ALL the way to have the procedure start (at least, that was the solution with my machine). Good luck!

SOURCE: new delonghi magnifica esam 3200.s from

Run the hot water tap till it comes good.

SOURCE: DeLonghi Magnifica 3200 how to increase coffee temperature?

Evening to you
Not hot enough, do you leave it to stand with the green lights on?
By my experience the machine is best left on so everything is hot when the water passes through.
To let some time pass before you make the next cup.
And lasly to make sure that machine is clean.
Good luck
kolbrun