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Milk not heating up
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Discussions > Espresso > Machines > Milk not heating...  
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kmetzger
Senior Member
kmetzger
Joined: 31 May 2011
Posts: 47
Location: Mexico
Expertise: Just starting

Espresso: Gaggia Classic
Grinder: Baratza Vario
Posted Tue Apr 8, 2014, 5:46pm
Subject: Milk not heating up
 

I recently installed a new steam valve and steam thermostat because coffee was spraying all over the place when I pulled a shot. That problem has been solved but a new one has cropped up: I can't get milk to heat up. Everything starts out nice but after a minute or so steam stops coming out of the wand and the milk doesn't get hot. What's wrong? Kim
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z0mbie
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z0mbie
Joined: 26 Sep 2013
Posts: 382
Location: Online
Expertise: I live coffee

Posted Tue Apr 8, 2014, 7:46pm
Subject: Re: Milk not heating up
 

kmetzger Said:

I recently installed a new steam valve and steam thermostat because coffee was spraying all over the place when I pulled a shot. That problem has been solved but a new one has cropped up: I can't get milk to heat up. Everything starts out nice but after a minute or so steam stops coming out of the wand and the milk doesn't get hot. What's wrong? Kim

Posted April 8, 2014 link

Let me see if I can understand your problem a little better.   You said you installed new steam valve and thermostat because coffee was spraying all over the place.

It's not clear to me if the steam wand was leaking and causing you to lose pressure or if the thermostat was failing to maintain the boiler pressure... or both?  ...and most importantly, how it relates to causing your shots to spray all of the place.. These seem to be entirely separate issues.

Your sprayed shots are caused by channeling that can be caused by a variety of reasons not related to the steam valve, steam wand, or even thermostat.. if anything a failed thermostat would cause either too little pressure, or too much pressure (neither by themselves could cause channeling/sprayed shots--unless the spraying was coming from other places beyond the bottom of the portafilter).


It sounds to me like you've literally run out of steam.    A functioning boiler should be able to provide continual steam.   The fact that you ran out mean the thermostat has tripped and cut power to the boiler.
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,950
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Wed Apr 9, 2014, 5:04am
Subject: Re: Milk not heating up
 

Or a bad group gasket.
No steam sounds like the wrong thermostat was installed.

 
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Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

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emradguy
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emradguy
Joined: 31 Mar 2011
Posts: 3,226
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 9, 2014, 6:10am
Subject: Re: Milk not heating up
 

z0mbie Said:

Your sprayed shots are caused by channeling

Posted April 8, 2014 link

I highly doubt the OPs described problem is from channeling (though there's a decent chance that is one of his problems).  I've never seen spraying all over the place from a spouted pf, and if he were using a bottomless pf, it's likely that he's already worked through his distribution issues beofre now, or he'd be asking something along the lines of how to fix channeling issues when using a bottomless pf.

 
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Always remember the most important thing is what ends up in your cup!
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kmetzger
Senior Member
kmetzger
Joined: 31 May 2011
Posts: 47
Location: Mexico
Expertise: Just starting

Espresso: Gaggia Classic
Grinder: Baratza Vario
Posted Wed Apr 9, 2014, 6:30am
Subject: Re: Milk not heating up
 

OK, thanks again for all the quick replies. I am using a new group gasket and have thoroughly cleaned the machine. I had a problem a few months ago with coffee gushing out during pours. See photo of dirty machine caused by the constant gushing. On another forum the proposed solution was to replace the steam valve and steam thermostat.
After replacing those items, my gushing problem was solved. I get very good espresso. But I was unable to get hot milk. Just now I also replaced the brew thermostat that I had ordered. But I assume I had the wrong brew thermostat (Coffee thermostat - DM-1168 - Gaggia Coffee Thermostat threaded M4 120V) because the gushing problem re-occurred and I quickly put the old brew thermostat back in. I tried steaming milk again and got a very loud noise. The milk got hot, but now my machine is dead. Nothing lights up. I killed my machine.

kmetzger: Orchestra011.jpg
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kmetzger
Senior Member
kmetzger
Joined: 31 May 2011
Posts: 47
Location: Mexico
Expertise: Just starting

Espresso: Gaggia Classic
Grinder: Baratza Vario
Posted Thu Apr 10, 2014, 6:45am
Subject: Re: Milk not heating up
 

I'd be very grateful if someone would venture a guess as to what killed my machine and what I have to do now to fix it. New thermal fuse?
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