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Duetto Suddenly Throwing Higher Pressure and Increase in Overflow
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ryandunlap
Senior Member


Joined: 15 Sep 2009
Posts: 104
Location: Syracuse, NY
Posted Sat Jul 7, 2012, 6:01am
Subject: Duetto Suddenly Throwing Higher Pressure and Increase in Overflow
 

Recently my Duetto II has been throwing about 11-12 bars of pressure and a noticeable flow of water pours into the overflow tray.

It was not gradual, but appears to have happened suddenly under otherwise normal performance.

Some considerations for your debugging:

(1) The machine is less than a year old.
(2) My water is hard and I've been pretty negligent in converting it to softer water.
(3) I don't regularly clean my machine either. :(

Thanks in advance!
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ryandunlap
Senior Member


Joined: 15 Sep 2009
Posts: 104
Location: Syracuse, NY
Posted Sat Jul 7, 2012, 8:59am
Subject: Re: Duetto Suddenly Throwing Higher Pressure and Increase in Overflow
 

Not sure if this is related either, but the lever doesn't seem as reliable staying in the up position. (A slight touch and it turns off.) But that might be unrelated and just needs to be tightened, unless pressure helps keep it staying up.

Thanks again.
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emradguy
Senior Member
emradguy
Joined: 31 Mar 2011
Posts: 3,154
Location: Houston
Expertise: I live coffee

Espresso: Duetto II; Twist v2
Grinder: M Major, Macap M4, Pharos,...
Drip: Espro presses; Aeropress
Roaster: H-B "List of Favorites"
Posted Sat Jul 7, 2012, 12:38pm
Subject: Re: Duetto Suddenly Throwing Higher Pressure and Increase in Overflow
 

I'd recommend a descale and thorough detergent backflush.  You'll probably want to remove the shower screen and thoroughly clean the group head.  Be sure to have backup screen and a backup gasket handy, in case you have to ruin them when you remove them. That may be all you need.

If you try these steps and they don't work, I'm sure someone more experienced in troubleshooting and repair will chime in and help.

 
.
Always remember the most important thing is what ends up in your cup!
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emradguy
Senior Member
emradguy
Joined: 31 Mar 2011
Posts: 3,154
Location: Houston
Expertise: I live coffee

Espresso: Duetto II; Twist v2
Grinder: M Major, Macap M4, Pharos,...
Drip: Espro presses; Aeropress
Roaster: H-B "List of Favorites"
Posted Mon Jul 9, 2012, 3:40pm
Subject: Re: Duetto Suddenly Throwing Higher Pressure and Increase in Overflow
 

Ryan,

How's your Duetto doing?  Were you able to get your problem solved?  I was thinking more, and especially because of the sudden onset, would really suspect that some crud got into one of the group valves.

 
.
Always remember the most important thing is what ends up in your cup!
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ryandunlap
Senior Member


Joined: 15 Sep 2009
Posts: 104
Location: Syracuse, NY
Posted Mon Jul 9, 2012, 7:32pm
Subject: Re: Duetto Suddenly Throwing Higher Pressure and Increase in Overflow
 

I haven't been able to descale it yet. (Just drinking the worst caps ever.) I'll try to descale this weekend, but I'm not sure how. Haven't I read that's something that shouldn't be done by consumers? Is there a guide? Do I just use white vinegar?

(I did do the backflush and that had little effect.)
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emradguy
Senior Member
emradguy
Joined: 31 Mar 2011
Posts: 3,154
Location: Houston
Expertise: I live coffee

Espresso: Duetto II; Twist v2
Grinder: M Major, Macap M4, Pharos,...
Drip: Espro presses; Aeropress
Roaster: H-B "List of Favorites"
Posted Tue Jul 10, 2012, 7:30am
Subject: Re: Duetto Suddenly Throwing Higher Pressure and Increase in Overflow
 

I've seen three different guides for descaling a DB machine, but don't have the links handy (sorry).  

In no particular order...

Home-Barista's cleaning and maintenance guide (it covers pretty much every type of machine and includes how-to's and how-often-to's)
The Vibiemme Double Domobar Manual (written by Randy Glass - aka "frcn").  Downloadable from Stefano's website.
1st-line.com

I've got 1st-line's guide in a Word 2007 document and I've got the Vibiemme manual on my hard drive, so if you shoot me an email I can send you them both.  The Vibiemme manual also has an awesome detailed explanation of the mechanics of E-61.

It really doesn't sound all that difficult and if you've ever descaled an SBDU you shouldn't have any problem at all, as long as you follow their directions. (right, I haven't done mine yet either, but I don't see me sending it out for that).

I plan to use Cafitza, but there are other products available.  You can get one or more of them from all of the well-respected sites you always read about here in CG for parts, supplies, etc.

When you order, you might want to pick up an in reservoir softener.  Chris' has a good one that merely requires a cartridge swap periodically.  It's a little more expensive in the long run than one that you have to run salt through to recharge, but it's way more convenient (and IMO worth it).  They say replace the cartridge every 3 months, but I recommend getting a bunch of test strips and checking the water coming out of your hot water wand (just let it cool to room temp before you check the hardness).

 
.
Always remember the most important thing is what ends up in your cup!
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