Question about Krups XP 4000 Espresso Machine

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Pump makes strange staccato sound at 1 second intervals. A little coffee dribbles out. Then it just shuts itself off. Seems to be a pressure problem?

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Check the grind on the coffee or the packing pressure used to tamp. If it flows great without coffee in the portafilter, then the problem is the grind or tamp. The grind might be too fine that the pump has to use so much pressure that the relief valve open and most of the water goes into the drain tray.

Posted on Jun 30, 2009

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1 Answer

Leaking water under the drip tray


First, be sure to regularly push a straightened paper clip in that nozzle! It can get clogged with coffee grinds quite easily.

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I've looked up and read many of the pump problem responses and none of them seem to match my issue. Yesterday my Rancilio Silvia worked just fine. I first want to say that I clean my grouphead often...


Typically when this issue has occurred it is the pump. The pump may still run but there is no suction. This is normal once it fails. There really isn't much else in the machine for this to happen. It's rather simple inside.

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I have been having trouble with the coffee coming out (vvery slow flow) so I descaled the machine today. Now its worse - it is just dribbling out - doesn't seem to have enough water going through. Can you...


2 things can cause this.
1. the grinder is set to fine abd you are creating to much pressure and the pump is having a hard time pushing water through.
2. You are getting a blockage in the brew head from coffee residue and oils.
Tru pushing the prre grind button and making a coffee without putting any coffee in. Blank shot. If it works its you grind. If not its your brew head. Needs to be cleaned.

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Try running the gro;up without the portafilter in place, what does the water flowq look like: is it a nice strong flow or barely a dribble. If if is barely a dribble, backwash machine with purocaff and check shower screen, that may be clogged. If you have a nice flow then try adjusting the grind on the coffee grinder.

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Well, I am no plumber but I would think that 108 psi is a bit high for your plumbing system. I have this pump installed in my house and have the max pressure set at 50 with a PRV on the outlet side of the pump.

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I have a Karcher K 3.86 M electric PW with a similar problem: water leaks from the pump near the outlet and the pressure surges on and off continuously at intervals of 1-2 seconds. The leak appears to be coming from a very thin crack in the plastic pump head in what I think is the "unloader" valve portion. I read elsewhere that if you leave water in these PW's and it freezes it will crack, causing leaks. I don't know how you can empty all the water out so I think we must store these PW's in areas that won't freeze in winter.

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