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Gaggia Classic produces sour shots
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Moose1
Senior Member


Joined: 24 Aug 2012
Posts: 1
Location: Norway
Expertise: I love coffee

Posted Sat Aug 25, 2012, 7:42am
Subject: Gaggia Classic produces sour shots
 

My six year old Gaggia Classic recently started pulling sour shots, which got me thinking that the temperature is too low.

Details are:

- Recently cleaned grinder
- Recently cleaned machine
- Coffee is fresh (roasted about a week ago, tried making it in an aeropress just to be sure)
- 14 g coffee finely grinded in a double shot
- 20-25 seconds to pull 50 ml (1.8 oz) double shot

Measured temperature (in pre-heated paper cup with thermometer) to 82 degrees C  (180 F)
I changed the thermostat, but there is only a marginal change in temperature (82-84 degrees C - 180-183 F) and the shots are still sour.

Is there anything more I could do, or is my Gaggia ready for retirement?

Hoping someone out there can help.
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RichardCoffee
Senior Member


Joined: 2 Dec 2010
Posts: 127
Location: Long Beach
Expertise: I live coffee

Espresso: gaggia baby twin, mini...
Grinder: fiorenzato pietro 63mm,...
Roaster: weber grill with rk drum,...
Posted Sat Aug 25, 2012, 7:53am
Subject: Re: Gaggia Classic produces sour shots
 

Since it's a recent phenomenon after just cleaning the machine, my first guess would be that you haven't fully flushed out the citric acid you used.

 
Bean2friends
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 2,021
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Sat Aug 25, 2012, 2:38pm
Subject: Re: Gaggia Classic produces sour shots
 

Not sure where to start.  Sounds like you will have well flushed the machine by now as you have had time to acquire and change B-stat.  Perhaps you had one lying around.

If you have not flushed the machine, that may well be the cause as suggested.

It is difficult to believe that brew temperature on 2 brew stats.  You specified pre-heated cup and I am not sure that I completely understand.  I found that I had to heat everything.  You probably did everything correctly, but so that we can help, I will cover some of my past mistakes. Not all "instant" read digital thermometers are created equally.  Get some idea hot fast it reads by sticking it in boiling water.  Most are hardly instant.  I keep the thermometer hot, about 180 - 210F, in a cup of water.

I let the machine stabilize for about 30 mnutes with PF on, so that the group and head are up to temperature.

I used styrofoam, and also paper, with similar results.  I assume that the cup is much cut down in height and volume and that you have inserted the thermometer through the side.  When all is ready, I put the heated thermometer in the cup side and pull about 30 ml, about 3 seconds.  Water cools very quickly and you will see the temperature peak and quickly fall.

Where are you in the temperature, brew-stat, switch light cycle; are you surfing or could that be the b-stat low?

 
D4F also at
http://www.gaggiausersgroup.com/
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