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FIXED Duetto II steam boiler slow fill during descale flush
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emradguy
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emradguy
Joined: 31 Mar 2011
Posts: 3,223
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 Wed Apr 16, 2014, 10:22am
Subject: FIXED Duetto II steam boiler slow fill during descale flush
 

EDIT: I was misinformed. The Duetto II is not pumbed that way (below).  The brew boiler and steam boiler are plumbed in parallel (not series).  Seems my problem is related to crud plugging the solenoid going to the steam boiler.  Thought I had it fixed, but then it plugged again...arrrrgggghhh!  And now "work" is getting in the way of "life".

ORIGINAL POST:  My Duetto is acting very bizarrely.  I backflushed with Cafitza, then descaled with Citric Acid.  The steam/hot water boiler wouldn't fill during the flush out phase of the descale and the alarm would come on (with machine shutting off automatically).  When I flipped the power switch on and off and then ran water through the group, the pump drew water just fine.  I called Chris' and talked to one of the techs who suggested cleaning off the fill probe in the steam/water boiler. After doing that, using some 600 sand paper until it was nice and shiny again, the steam/water boiler is now filling, but it's really slow.  When I activate the group, the pump sucks water from the reservoir just fine. This is really weird because the pump pulls water from the intake and pushes it through the steam/water boiler first, and then on to the brew boiler. So, I would think if the brew boiler activates a well working pump, then there shouldn't be any problem refilling the steam boiler after bleeding some if it off. Any other ideas, what I should check into?

 
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emradguy
Senior Member
emradguy
Joined: 31 Mar 2011
Posts: 3,223
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 Wed Apr 16, 2014, 3:19pm
Subject: Re: Duetto II steam boiler filling slowly during descale flush
 

So, I've got a little down time and have been trying to find photos of the valve disassembled.  Mostly, so I can get an idea how clean each component is supposed to be internally.  At the top of (excuse my ignorance about the component names) the plunger-like part - the one that seems to move up and down - there's a glob of blackish gunk, that I'm guessing is dried up lubricant? Or is it something that is supposed to be there?  There was a thin film of the stuff on two sides of this plunger-like piece, which I removed.

Also, when I reassemble the apparatus, do I need to lubricate any of it with Dow-111?

 
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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: 3,223
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 Wed Apr 16, 2014, 9:50pm
Subject: Re: Duetto II steam boiler filling slowly during descale flush
 

excellent! There's a coil of metal in the solenoid intake line.  It was gunked up big time.  I got decent idea about my solenoid assembly as well, from playing around with it and inspecting it close up with great lighting.  I think most of the gunk I saw needed to be cleaned off.  After doing so, I noticed the black blob is actually a rubber seal.  I still don't know if it needed any internal lubrication, but I guess time will tell.

 
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