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No Brew Pressure with my Anita
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Discussions > Espresso > Machines > No Brew Pressure...  
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GRC123
Senior Member


Joined: 10 Dec 2009
Posts: 20
Location: Santa Barbara
Expertise: I live coffee

Posted Wed Nov 14, 2012, 9:05pm
Subject: No Brew Pressure with my Anita
 

My Anita is 2 years old and I just had it apart to re-insulated the boiler. Once back together, I ran it up to temp and gave it a test shot with the blind filter and only got 4 bar. I tried adjusting the brew pressure and it just gets worse. I thought I was possibly turning the nut in the wrong direction, but I verified I have turned it correctly (to the right). It just gets worse. Now, my blind shots get 1 - 2 bar. I also rechecked for any wires that may have come loose (none). I did notice that one of the pump mounts was not screwed down so I fixed that. Do I have a bad pump?
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NobbyR
Senior Member
NobbyR
Joined: 10 Jul 2011
Posts: 2,041
Location: Germany
Expertise: I love coffee

Espresso: Poccino Opus One, Ariete
Grinder: Eureka Mignon Istantaneo
Vac Pot: N/A
Drip: Melitta Linea Unica de Luxe
Roaster: N/A
Posted Fri Nov 16, 2012, 6:10am
Subject: Re: No Brew Pressure with my Anita
 

Are there any noticeable leaks?

 
***
"This drink of the Satan is so delicious that it would be a shame to leave it to the infidels." (Pope Clement VIII on coffee, when he was urged to ban the beverage)
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GRC123
Senior Member


Joined: 10 Dec 2009
Posts: 20
Location: Santa Barbara
Expertise: I live coffee

Posted Fri Nov 16, 2012, 8:02am
Subject: Re: No Brew Pressure with my Anita
 

Nope, no leaks.
I did however talk to Roger at Chris's Coffee (the man is a genius and very helpful) and he walked me through the symptoms. Conclusion is that I either have a bad pump or a bad expansion valve seat. I ordered them both and I'm hopeful I'll be back in great espresso.
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NobbyR
Senior Member
NobbyR
Joined: 10 Jul 2011
Posts: 2,041
Location: Germany
Expertise: I love coffee

Espresso: Poccino Opus One, Ariete
Grinder: Eureka Mignon Istantaneo
Vac Pot: N/A
Drip: Melitta Linea Unica de Luxe
Roaster: N/A
Posted Mon Nov 19, 2012, 6:02am
Subject: Re: No Brew Pressure with my Anita
 

Good luck then. Let us know how it worked out.

 
***
"This drink of the Satan is so delicious that it would be a shame to leave it to the infidels." (Pope Clement VIII on coffee, when he was urged to ban the beverage)
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GRC123
Senior Member


Joined: 10 Dec 2009
Posts: 20
Location: Santa Barbara
Expertise: I live coffee

Posted Mon Nov 19, 2012, 9:54pm
Subject: Re: No Brew Pressure with my Anita
 

Things went from bad to worse.

I replaced the pump and the expansion valve seat. Now, I get adequate brew pressure, but the pressure does not completely drop after lowering the brew handle. It will drop from 9 bar to 4, then slowly climb back up to 9. If I rock the lever between the down position and 45 degrees, the excess water will flow out the pressure relief valve in front and reduce the pressure. As a result of all this excess pressure, my expansion valve in the back now leaks.
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SStones
Senior Member
SStones
Joined: 24 Nov 2012
Posts: 477
Location: Canada
Expertise: Professional

Espresso: Giga 5, ECM Giotto, Rocket...
Grinder: Anfim Milano-Best
Vac Pot: No  :(
Drip: Some $30 thing from Walmart
Roaster: I buy pre-roasted.
Posted Sun Nov 25, 2012, 6:47pm
Subject: Re: No Brew Pressure with my Anita
 

Wow.  New problem is cool...  Is the pump still running when the handle is lowered to 45 deg?  And when the handle is all the way down?  All the way down opens the drain valve, the part below the brewhead. This allows pressure in the brew head to escape to the tray so you don't get a facefull when you pull off the portafilter.  At 45 deg, your drain valve should be closed but the pump should not come on. Above 45 deg, your brew valve should open first before the pump is activated further above 45 deg for brewing at 90 deg (up).
If the pump is running, even after the upper valve in the brewhead is closing, then you need to move the pump-switch further back into the machine, a little further off of the cam on your control-lever.  Is the control lever loose and able to move around, forward and back rather than just rotating?

If your pump is not running while your brew pressure is climbing to 9 BAR, is it plumbed in? And is your waterline pressure overcoming your pump and pressurizing your system?

We can probably figure this out with enough questions and answers...  Or probably Chris can, he is damn good at this.
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GRC123
Senior Member


Joined: 10 Dec 2009
Posts: 20
Location: Santa Barbara
Expertise: I live coffee

Posted Sun Nov 25, 2012, 10:38pm
Subject: Re: No Brew Pressure with my Anita
 

Sorry, I may not have communicated well. The pump doesn't continue running. The pump shuts off when the lever is at the 6 o'clock position as well as the 45 degree position, as normal. It is the brew pressure that climbs back up. I did talk to Jason at Chris's Coffee and he told me that as long as the pressure in the head group has been relieved (which is indeed the case) then the residual pressure indicated on the gauge is inconsequential.
He also sent me a new o-ring for my expansion valve which I'll replace when I get the energy to tear it open again. I put teflon tape to seal up the leaky valve but I should get back in there and replace the o-ring.
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