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My Bialetti mukka expresso maker won t push coffee into the top chamber the pressure valve pops up but the coffee doesn't come out.

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Hey, it might be congested - this happens sometimes when coffee grounds get stuck in any part after a while - take the whole thing apart, including the gasket and filter and scrub everything out, then do a water run (no coffee) just to clear the thing up.

The problem might also be with coffee ground stuck in the pressure valve nozzle. Run water through it to see if it spurts out to check if there's any obstruction.

To get rid of the stuck ground in the nozzle, i once used a piece of dental floss twisted to reach within the nozzle.

hope this works for you!


Posted on Apr 23, 2009

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Posted on Jan 02, 2017

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I had the same problem and saw this solution in another bialetti mukka problem report, which made sense: "the safety valve on the lower boiler chamber is there to release pressue in case too much prssure builds up in the pot when brewing. If youy have an 11 mm wrench you can take it out and clean it by pulling on the outsidepart, there is a little knob that may be grabbed by a tweezer, gently pull it out, it is spring tensioned, and run water in the opposite end, Chances are some coffee grounds particles got in it and it is not seating good. after cleaning put a few drops of olive oil in it , the inside part. Should seal better and still funtion as a safety valve. Or you can leave it in place in the pot and just pull on the outside , flush with water and then put a few drops of olive oil in it. While you are at it, put olive oul on the threads, olive oil film and the the rubber seal and add a little to the rubber button on the top valve."

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the safety valve on the lower boiler chamber is there to release pressue in case too much prssure builds up in the pot when brewing. If youy have an 11 mm wrench you can take it out and clean it by pulling on the outsidepart, there is a little knob that may be grabbed by a tweezer, gently pull it out, it is spring tensioned, and run water in the opposite end, Chances are some coffee grounds particles got in it and it is not seating good. after cleaning put a few drops of olive oil in it , the inside part. Should seal better and still funtion as a safety valve. Or you can leave it in place in the pot and just pull on the outside , flush with water and then put a few drops of olive oil in it. While you are at it, put olive oul on the threads, olive oil film and the the rubber seal and add a little to the rubber button on the top valve.

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it did that to me too, so I reduced the amount of milk to the indicated level inside. No more mess after that.

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Mukka valve broke


HAVE YOU TRIED SYDNEY?

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