I own a Delonghi Rialto automatic espresso machine model: EAM 4500. There are two white hard plastic spouts on the front right-hand side of the machine that mate to the milk carafe. A green O-Ring that seals the upper smaller white spout to the milk carafe has failed and I need a new one. I called the Delonghi repair center in Texas to obtain parts and they said that they are not allow to sell me even an "O-ring". Apparently, you require the machine be sent to them for repairs? Are these people insane! This is ridiculous! I bought this at Starbucks and paid $1200 for the machine and it won't function properly because of the failure of a twenty-cent part! Does anyone know where I can find the proper O-Ring myself so that I can get back to enjoying espresso? Thank you!

Step: 1 Switch off your coffee maker. Remove the first brewer unit. Wash it thoroughly under running water.

Step 2: clean the coffee grinder using vaccum cleaner.

Step 3: switch on the Machine !!! Make Coffee

(Note: if you hear loud noises during coffee preparation then please use food graded grease to fix it)

Here is a link to the manual. Descaling is described starting on page 18. http://www.encompassparts.com/shop/research_new/DEI/om/EAM4500.pdf

try bleeding it through the steam pipe when it starts up... if not no good you my need a new element ,,,07779933829

I had the same problem!! I was able to find one on Amazon:
http://www.amazon.com/DeLonghi-5532124900-HOT-WATER-SPOUT/dp/B002EKFX06

It works on 4500 as well as a couple of other models :)

I'm not sure if there is a specific model number on yours. But here is a link to a DeLonghi Rialto 4500. http://www.starbucksstore.com/images/products/pdf/4_Rialto_Espresso_Machine.pdf

remove the o rings where the milk frother connects to, there is a green, red and black rubber O ring. Remove them and get a toothpick and clean around where they sit. You will notice a hard milk build up like when you get on your teeth. This is what
tbirdfan1 says:
may be causing your problem the o-rings are not setting their properly
tbirdfan1 says:
here is some more information
tbirdfan1 says:
It turns out the electrical connection for the solenoid valve that feeds the hot water out into the milk jug/hot water tap had come loose. They are clipped on rather than being soldered into place. Trace the wires back to the main board from the sole
tbirdfan1 says:
from the solenoid (brass bit with grommets) and check that the clips are in place.

Me too! They ordered me a new milk pitcher from Italy. Didn't work. They told me to run it through some tests using water in pitcher. Didn't work. They then told me to send it in to a Delonghi repair shop. They just told me that it was all "clogged up" and also needed a new generator. The tow are linked together. We descaled fairly regularly. Total tab: $380! OUch! Have not told them to go ahead. seaching for cheaper solutions. Let me know if you hear of any. [email protected].
Will Houston TX

use 1/4 cup of vinegar and fill pot with cold water, run through machine

I had the same problem. I ended up taking the coffee machine apart and found that the reason coffee trickles out around the hot water spout is that the two coffee nozzles were partially plugged. Since I Had parts of the coffee machine apart I was able to clean it easily. It may also be possible to clean the assembly using a pick of some sort and clean out the holes of the two normal coffee spouts. Inside it is just a open cavity so gentle poking around and using some steaming hot water may do the trick.
If you want to take the machine apart you need to do the following: 1) take of the warmer plate on the top - 2 storz screws but an allen key works as well 2) take off the top plate of the machine - another 4 or 5 screws - make sure you empty the beans first otherwise you will have a mess 3) remove one screw from the right hand side of the removable coffee ground tray. Once this screw is removed the front panel is free to swing open except for the pipes connecting the front 4) unclip the steam assembly - there are a couple of plastic catches on the top. this will free the steam assembly from the front panel and also free a pipe connections. The steam dispenser pipe will also come free from the steam assembly. 5) remove the coffee pipes from the up and down sliding coffee dispenser. This is a small whitish color clip with 2 pipes connecting into it. The white clip has a little plastic catch on the top that frees it. The front panel should now swing open freely. 6) remove the sliding coffee dispenser from the front door. There are 4 plastic catches, 2 on either side. the whole front sliding coffee displenser now comes free 7) Take the sliding dispenser apart by release the 4 plastic catches on the front curved planel. 8) Inside the sliding dispenser is a white plastic piece that connected to the piping released in step 5. There is a small plastic catch that needs to be pressed while pulling fairly hard on the plastic piece and bending the whole piece. 9) You will now see the plugged spouts. It goes back together really easily.

You need to descale the machine with descaling solution.
look at following link for instructions

DELONGHI