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High boiler pressure on startup.
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RussK
Senior Member
RussK
Joined: 6 Jan 2013
Posts: 40
Location: Mississippi Delta
Expertise: I love coffee

Espresso: Alex II
Grinder: Mazzer Mini Type B
Drip: Bunn DV TC / Chemex / Hario...
Posted Sat Feb 16, 2013, 1:40pm
Subject: High boiler pressure on startup.
 

I purchased an Alex II HX machine a several of months ago and it has given me hours of enjoyment, but I have noticed a little quirk. When I turn the machine on from a cold start, on occasion, the boiler pressure will go up to around 2 BAR and stay there until I will open the steam wand, then it will stay at 1.3 BAR where I have it set. After that the machine operates as usual.

Now I know that this really is not much of an issue, but I was just curious if anyone else had ever noticed anything like this or could offer an explanation as to what might be the cause of it.

Thanks
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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 Feb 16, 2013, 3:33pm
Subject: Re: High boiler pressure on startup.
 

A possibility of a stuck valve and false pressure?

A good explanation on page 2, billc, if it is a stuck valve and false pressure.  There are enough HX users that someone may know more.

Click Here (coffeegeek.com)

 
D4F also at
http://www.gaggiausersgroup.com/
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DavecUK
Senior Member


Joined: 21 Sep 2005
Posts: 1,449
Location: UK
Expertise: I love coffee

Posted Sat Feb 16, 2013, 6:09pm
Subject: Re: High boiler pressure on startup.
 

From the specific symptoms you describe, I am going to assume that the Alex II has a PID controller and NOT a pressurestat. If it does, then it is a sticky vacuum breaker valve, this can either be cleaned, o rings replaced, or the entire valve replaced. You can as an quick fix try getting the machine up to full steam pressure, remove the top panel and using a long wooden object press down on the vacuum breaker pin for a few seconds (if it's visible), this can often "steam clean" the seals. Unfortunately many machines now have a double lock nut and tube to route vacuum breaker "splutter" to the drip tray or tank. This is a bit of a shame as it makes this 1 minute fix more difficult to do. Much more information for you below.

http://coffeetime.wikidot.com/search:site/q/vacuum%20breaker

P.S. If the machine uses a pressurestat and NOT a PID, then it's a possibly a sticky/faulty pressurestat.....but form your symptoms and description, this is unlikely and the machine has a PID.
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RussK
Senior Member
RussK
Joined: 6 Jan 2013
Posts: 40
Location: Mississippi Delta
Expertise: I love coffee

Espresso: Alex II
Grinder: Mazzer Mini Type B
Drip: Bunn DV TC / Chemex / Hario...
Posted Sat Feb 16, 2013, 8:38pm
Subject: Re: High boiler pressure on startup.
 

Thanks for the quick response guys. I believe you are correct Dave. I was reading the post that D4F recommended and it suggested that it could be the same thing. My machine does have the PID so that throws out the pressurestat. Do you all think that the vacuum breaker would only stick occasionally or would it consistently stick?
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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 Feb 16, 2013, 8:55pm
Subject: Re: High boiler pressure on startup.
 

Not your machine, but a vacuum breaker thread.

Click Here (www.home-barista.com)

Sounds like intermmittent and gets worse, but different causes with perhaps different courses.  DavecUK may know more, but another good thread.

 
D4F also at
http://www.gaggiausersgroup.com/
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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 Feb 16, 2013, 9:03pm
Subject: Re: High boiler pressure on startup.
 

duplicate deleted

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