Question about La Marzocco Linea Series Group 3 Espresso Machine Espresso Machine

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Grouphead not dispensing water

Four group machine. second from left group has pressure but is not dispensing water

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  • Anonymous Mar 16, 2014

    we bought a used cecilware venezia machine. The make and model sticker is worn off, but it is a two group machine. The problem we are having is the dispensing pressure. We can't seem to get the pressure above 5-6 Bar, and the shots we are pulling are slow and barely any water is coming out. How do we adjust the pressure? It has a manual dispense button for the groups, if that helps identify it's make and model.

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  • Master
  • 1,618 Answers

Remove the shower screen and press button to brew, if water flows the the holes in the screw/diffuser is blocked, if water does not flow then the blockage is at the solenoid or within the group head chamber. This problem I have notice when someone brewed without the shower and screw in place.

Posted on Jun 30, 2009

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Posted on Jan 02, 2017

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I have a Rancilio Classe 10 Espresso Machine and the water is flowing unevenly between groups. The difference between shots is 11 seconds to 27 seconds. I have backflushed each group and replaced both...


It could be the metering jets in the grouphead and or flowmeters. Try pressing both buttons at the same time to see if they give you the same volume and time.

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To increase dispense pressure you turn the adjustment screw at the pump. When pulling a shot (use espresso) on one group the bottom needle of the gauge should read 9bars while pulling the shot.

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Correct, inside the grouphead their is a gasket which is the same diameter as the filterholter which make the perfect fit so the presure of the water will not leak out. So now either the gasket is damage in one point so you have the leak from that point. Second the gasket have become hard so it can not make perfect fit with filter holder. In both above case you have to replace the gasket. Finally their is aposibility that the gasket is dirty with coffee remains and again we can not have a perfect fit. You can use a hard brash with the water running so you can clean the gasket.
With this case you can unsrew also the shower from the grouphead and clean it also for better coffe results

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Check the nut on the top of the grouphead, make sure water is off and machine has cooled down, carefully remove nut, try not to damage gasket on the bottom of nut, check the screen and jet.

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No pressure in machine. i can't get any decent water stream from coffee outlet; only rare drops. steamer works fine. Can you help me?


Their are four posible reasons for above problem as follows.
First the Vibarating pump not creating pressure, usaly if here the sound it is pressing but not always. You can loose the pipe nut after the pump to see if you have any pressure after you press the coffee button. Be carefull with the water leaking.
Second the coffee solenoid valve that is on the grouphead might be stuck from dry coffee, it can be removed and cleaned with hot water and a wire brush.
Third the coffee group shower and inside round dish might also blocked from dry coffee, remove it and clean it.
Finnaly the more difficult problem might be that boiler-thermoblock is full off scale. So you must remove and descale the thermoblock boiler and the copper pipes to them.
This problem is the more difficult to be performed however if the water you have use was very hard then this is the most posible.
Good luck,
Remeber to vote for this answer.

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La Cimbali Junior has no output at the grouphead. The steam wand and hot water dispenser work fine. Any ideas.


Their are four posible reasons for above problem as follows.
First the Vibarating pump not creating pressure, usaly if here the sound it is pressing but not always. You can loose the pipe nut after the pump to see if you have any pressure after you press the coffee button. Be carefull with the water leaking.
Second the coffee solenoid valve that is on the grouphead might be stuck from dry coffee, it can be removed and cleaned with hot water and a wire brush.
Third the coffee group shower and inside round dish might also blocked from dry coffee, remove it and clean it.
Finnaly the more difficult problem might be that heat excanger that is bettween the headgroup and boiler is full off scale. So you must remove group and clean both group and heat excanger and the copper pipes to them.
This problem is the more difficult to be performed however is the most posible.
Good luck,
Remeber to vote for this answer.

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Astra Mega II <----Need help!


The left grouphead sounds like a different problem than the right group head. For the left grouphead, I would start by replacing the group electro-valve. With hard water, this can cause the valve to remain in the closed position even though the water pump is running.

For the right group head, I would want to see this happen. Usually, if the gaskets haven't been replaced in a while (if you are busy, your 'while' may be quicker than others), I would evaluate the condition of the rubber gasket. I would also look at whether you are tamping too much espresso grounds into the portafilter. This can cause a similar symptom as a bad gasket.


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