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How old is your machine ? and what maintenance have you done over time such as replacing the shower curtain located at the pourring end of the hot water ? I had too very loud noise coming occasionnally from the stainless steel rack holding the cup while coffee is delivered. If your ground coffee is too fine it will stop flow during making a shot. Is water coming out when no coffee is placed in the portafilter.The water pump on this machine is a cheap pump that has to be replaced over time. Mine is 7 years old and has delivered four cups of expresso everyday of the year, and still working.
The scale in the pipe system have norrow at some points so while brewing and with hight pressure you here the whistle.
First I sugest to descale the machine and you may try to do it for three days repeatevly.
However if the noise will not decrease then the machine need full desasemble and remove the scale manualy. But I advice only to do the above if you have problem with the coffee quality or if the noise is so strong and can not bair it any more.
Remove drain tray. Four screws on inside wall. Open top fill point and remove white strainer tray. 3 screws under tray. 2 more in back of machine. Side panels sort of pop-slide outwards. Please note that this is not a simple machine to fix. (even for us techs) lots of plastic that can snap off. Suggest turning into service center. also note that the most common problem with the 400 is a stuck packet which can be removed by bending a large paper clip straight and making a small hook on the end to try to catch the white tip on the package with a good yank from the front. Good luck!
The coffee solenoid valve can cause such a problem if it very old you must replace it
or the water pressure pump if the bypass it stuck and it produce more pressure than 9-10 bars no need to replace just clean or adjust the bypass.
Please remebr to vote for this answer thanks
I bet that's wild thing to see. Ok, Is ther a basket that'ds supposed to be there? If not,heat up a large paper clip,straightened of course and run it yhrough the hole. If the nozzle will come off, clean the burrs of the edges of the hole on the inside. It sounds like it's restricted if it's spraying. Good luck
Hi, Get 2 pots place one under the spray head with the filter cone in....now fill the other coffee pot and start to pour water through the lid top front...keep pouring water through (about two and a half pots) until water starts to pour through the cone....now the tank is full plug her in and turn on the power switch at the back and also the front if there is one....place filter in cone..put coffee in filter...pot on burner...wait about 25 minutes until water in tank is hot...when light on front comes on pour another pot of cold water through the top and you will get a pot of hot coffee in bottom....I also think this machine can be hard wired into water main....get plummer to hook up...follow same procedure but instead of pouring water through top for coffee..hit brew switch. if it poors too much of too little you will find a timer in the machine you can adjust to allow more or less water...hope this helps.