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Uneven pressure
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Discussions > Espresso > Machines > Uneven pressure  
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Frakus
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Joined: 20 Mar 2012
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Location: Montreal
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Grinder: Rocky
Posted Wed Jan 23, 2013, 1:26pm
Subject: Uneven pressure
 

Hi,

I've been getting uneven pressure lately from my machine (Bezzera BZ10).

When I start the shot, pressure ramps up to around 9 bars, but variates throughout the shot, as if the pump was somehow not able to keep constant pressure. I can see the pressure gauge oscillating and I hear the pimp variating in intensity.

I tried grinding a bit coarser, but then extraction is too fast.

Machine is fairly recent, so pump failure is not the first thing that I would think about.

Any suggestions on what I should check or correct?
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Frakus
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Joined: 20 Mar 2012
Posts: 5
Location: Montreal
Expertise: I love coffee

Espresso: Looking to buy...
Grinder: Rocky
Posted Wed Jan 23, 2013, 1:28pm
Subject: Re: Uneven pressure
 

That would be the pump (and not the pimp) variating (great autocorrect mistake...).
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
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Location: Riverside, Ca, U.S.A.
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Espresso: ECM Vene. A1, La Cimbali M32
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Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Wed Jan 23, 2013, 2:06pm
Subject: Re: Uneven pressure
 

Is the pressure constant with the back flush disk installed or if you block all water flow through the Pf?

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

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Frakus
Senior Member


Joined: 20 Mar 2012
Posts: 5
Location: Montreal
Expertise: I love coffee

Espresso: Looking to buy...
Grinder: Rocky
Posted Wed Jan 23, 2013, 2:19pm
Subject: Re: Uneven pressure
 

It remains constant with the backflush disk.
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fwtechwiz
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Joined: 19 Feb 2010
Posts: 530
Location: Fort Wayne, IN
Expertise: I live coffee

Espresso: Gaggia Evolution
Grinder: Hario Skerton
Posted Wed Jan 23, 2013, 3:03pm
Subject: Re: Uneven pressure
 

The BZ10 has a limescale filter in the reservoir.   Could the filter be plugging up and need replacing?
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mmorka
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Joined: 26 Sep 2013
Posts: 1
Location: Poland
Expertise: I love coffee

Posted Thu Sep 26, 2013, 7:32am
Subject: Re: Uneven pressure
 

Did you solved the problem?
I've got the same with my bz10.
Any solutions ?
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