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Troubleshooting Isomac millennium: shots are taking longer to pull
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Hector
Senior Member


Joined: 15 Jul 2012
Posts: 4
Location: Boston
Expertise: I love coffee

Posted Mon Jul 23, 2012, 4:08am
Subject: Troubleshooting Isomac millennium: shots are taking longer to pull
 

Hello,

This is my first post on this forum.  I have had an Isomac Millennium for 9 years now.  This morning I noticed that my shots are taking double the time to pull.  I normally pull them in 25 seconds and now they are taking about 40 to 50 seconds.  The coffee taste sour  -  not good.  There has been no change in the beans, grind or anything else.  Everything ran fine yesterday.  I have this system plumbed into the house water supply and have 2 in-line filters (charcoal and ion-exchange).  I typically brew coffee at home 2 - 3 times a day and have never encountered this particular issue.

Here are some observations:
  1. The boiler pressure is where i normally have it: 1.1 to 1.25 bar.  The pressure stat was replaced with a Jaeger unit within the last 2 years.
  2. I observed that back flushing is a little less intense than it normally is.  I am gauging this qualitatively by the lower sound that it makes.
  3. I evaluated the group pressure using a blind portafilter with a pressure gauge.  It registered about 8.5 bar.  I have never used one of these before and do not know what pressure I should have.  
  4. I tried increasing the grind size but the shots still took a long time and ran very thin implying poor extraction.
  5. I also tested the hardness of the water leaving the group head.  It was low suggesting that I should not have a scaling issue.  

I am not sure if I have a pump issue, expansion valve issue, solenoid value issue, blockage or other.  Any recommendations are greatly appreciated.

Thank you.

Hector

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NobbyR
Senior Member
NobbyR
Joined: 10 Jul 2011
Posts: 1,991
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 Jul 23, 2012, 7:15am
Subject: Re: Troubleshooting Isomac millennium: shots are taking longer to pull
 

Wasn't this already resolved? Kinks in the water feeding line...

 
***
"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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handcannon
Senior Member


Joined: 5 Jun 2003
Posts: 237
Location: Ames, IA
Expertise: I love coffee

Espresso: PIDed Zaffiro
Grinder: MCI, Innova, Zass, Capresso
Drip: Capresso Aroma Classic 461
Roaster: Modded FR & WBs
Posted Sun Jul 29, 2012, 7:33pm
Subject: Re: Troubleshooting Isomac millennium: shots are taking longer to pull
 

Those sound like similar symptoms my Isomac had a while back.  The cause turned out to be a partially plugged intake filter.  Water pumps generally don't like restricted inlet flow.  Check your feed line for any restrictions.

HTH,

Wayne

 
"Of all the things I've lost, I miss my mind the most."  A. Brilliant
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