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Gaggia Espresso Dose, Very Low Flow
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Discussions > Espresso > Machines > Gaggia Espresso...  
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jamichau
Senior Member


Joined: 24 Jul 2011
Posts: 10
Location: USA
Expertise: Just starting

Posted Wed Mar 5, 2014, 7:26pm
Subject: Gaggia Espresso Dose, Very Low Flow
 

We bought our refurbished machine through WholeLatteLove, two-and-a-half years ago. We have used only distilled water the entire time and it's always worked well until the last month, or so.  Shots pull very slowly. It takes two or three minutes to get two shots, the coffee flows at a trickle.  I'm looking for suggestions on where to begin troubleshooting and a progression of things to check, if the first, second, etc., doesn't fix the problem. Thanks very much, in advance,

-John
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,022
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Wed Mar 5, 2014, 9:57pm
Subject: Re: Gaggia Espresso Dose, Very Low Flow
 

John, you might start here

http://coffeegeek.com/forums/espresso/machinemods/656355

Also, please look at the machines here

http://www.partsguru.com/DosePureColorVivaEvolution.html

and then look at the internals of the Dose.  Aluminum or stainless boiler, match your boiler to the closest diagram.  No Dose diagram is shown, but it must be very close to one of the others.  

Post back with information and we can try to help:)

 
D4F also at
http://www.gaggiausersgroup.com/
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kolu
Senior Member
kolu
Joined: 28 May 2013
Posts: 29
Location: Reykjavík, Iceland
Expertise: Pro Barista

Espresso: Grimac La Uno
Grinder: Mahlkönig Guatemala, Porlex
Drip: Kalita Wave, Aeropress
Posted Thu Mar 6, 2014, 3:17pm
Subject: Re: Gaggia Espresso Dose, Very Low Flow
 

Internals of Dose are the same as Color & Pure except for the added MCU board, flowmeter in front of the pump & lots of messy wires.

Most likely you can find 3 sources of failure independent to the quality of your water:

  1. chceck the water reservoir. is the water inside getting warm? like really warm? like hot water returns from the boiler to the reservoir (via self-priming valve)?
    = faulty self-priming valve. clean it, replace it or (the best one) disable/seal it. google gaggia color self-priming valve fix. it's common fault.

  2. cool reservoir but no flow from the screen?
    = something in the one way valve at the output from boiler. take out the screen and the valve under it, clean it, reassemble.

  3. weird pump sounds?
    = dying pump. refer to D4F's instructions.
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jamichau
Senior Member


Joined: 24 Jul 2011
Posts: 10
Location: USA
Expertise: Just starting

Posted Fri Mar 21, 2014, 9:28pm
Subject: Re: Gaggia Espresso Dose, Very Low Flow
 

Well, this is a little embarrassing, but it appears to have been a clogged shower disc. Having never taken it apart before, I wasn't aware this part would clog, but it now makes sense. I took a brush to it under running water, replaced it, and tested.  Water flow seems normal. I apologize for taking your time and I appreciate your replies. Thanks,

-John
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Dave_E
Senior Member


Joined: 25 Mar 2014
Posts: 18
Location: Edmonton, Canada
Expertise: I love coffee

Espresso: Rocket Cellini
Grinder: Compak k3
Posted Tue Mar 25, 2014, 8:43am
Subject: Re: Gaggia Espresso Dose, Very Low Flow
 

Also can be an issue with too fine of a grind.  When I was dialing in my first Gaggia, I found the pump had some serious problems with an actual espresso grind.  It would sound like it was in the throws of a heart attack. Coarsen up your grind and it will flow better.  Mind you the extraction is a little quick with them too, so it takes some playing (like all machines).  None oily beans work best too.
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SJM
Senior Member


Joined: 17 Nov 2004
Posts: 1,721
Location: CA
Expertise: I love coffee

Espresso: SAMA (2), Maximatic, Cremina...
Grinder: K-10PB, Rancilio MD-50
Vac Pot: no like
Drip: no like
Roaster: HotTop   Huky en route
Posted Tue Mar 25, 2014, 9:06am
Subject: Re: Gaggia Espresso Dose, Very Low Flow
 

Dave_E Said:

Also can be an issue with too fine of a grind.  When I was dialing in my first Gaggia, I found the pump had some serious problems with an actual espresso grind.  It would sound like it was in the throws of a heart attack. Coarsen up your grind and it will flow better.  Mind you the extraction is a little quick with them too, so it takes some playing (like all machines).  None oily beans work best too.

Posted March 25, 2014 link

This suggestion makes no sense in the context of the OP's issues, which were already sorted by cleaning.  To coarsen the grind would have only given him swill, and, for the record, there is no such thing as "an actual espresso grind".
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Dave_E
Senior Member


Joined: 25 Mar 2014
Posts: 18
Location: Edmonton, Canada
Expertise: I love coffee

Espresso: Rocket Cellini
Grinder: Compak k3
Posted Sat Mar 29, 2014, 10:22am
Subject: Re: Gaggia Espresso Dose, Very Low Flow
 

What I meant by "actual espresso grind" is a well graded, fine grind.  The Gaggia superautos cannot handle a fine grind and when I used a real grinder to dose the machine, it couldn't handle it.  The reality is that a superauto cannot really produce a strong (I should be specific - by strong I mean great tasting and consistent) espresso.  Agreed - coarsening it up will be swill and will amount to a blonde gusher - if you go too far with it; but when the grind size is inspected when you get a decent flow rate, colour (and most importantly taste), the grind is much coarser than machines that are more "proper" read: separate machines with good pressure and temp control during extraction.

Definitely cleaning the brew unit weekly (if not more frequently) is very important.  Be sure to just use water, soap will remove the oil that is used in the brew unit to keep the parts moving.  

Sorry for the bad terminology - I prepare an espresso for myself that I feel is better than any I have gotten in town and though I am not attuned to the fine world of your dialect, I felt that offering advice on my experience is appropriate.   If you don't, then fine - skip over it.
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dingo1799
Senior Member


Joined: 17 Jan 2014
Posts: 26
Location: Stlmo
Expertise: I love coffee

Espresso: Couple of broken pavoni...
Grinder: Vario W
Vac Pot: Cory DRU/DRL
Drip: Nah
Roaster: Nah
Posted Sat Mar 29, 2014, 10:33am
Subject: Re: Gaggia Espresso Dose, Very Low Flow
 

jamichau Said:

Well, this is a little embarrassing, but it appears to have been a clogged shower disc. Having never taken it apart before, I wasn't aware this part would clog, but it now makes sense. I took a brush to it under running water, replaced it, and tested.  Water flow seems normal. I apologize for taking your time and I appreciate your replies. Thanks,

-John

Posted March 21, 2014 link

For coffee and espresso machines and grinders alike, cleanliness is next to godliness. Someone experienced can taste the difference between a dirty and clean machine. Equipment requires maintenance and upkeep, which means cleaning, descaling etc etc.

You should also look into using a spring water, or something beside distiller water. Distilled and RO is good for the machine, bad for the taste buds.
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