Our Valued Sponsor
OpinionsConsumer ReviewsGuides and How TosCoffeeGeek ReviewsResourcesForums
Espresso: Espresso Machines
Could this be a bad pressurestat in my Oscar?
Rocket R58 Double Boiler
Rocket Espresso R58 Double Boiler -  Everything you need for the perfect shot!
www.seattlecoffeegear.com
 
Not Logged in: Log In to Postlog in
New Topics updated topics   New Posts new posts   Unanswered Posts new unanswered  
Search Discussion Board search   Discussion Board FAQ faq   Signup sign up  
Discussions > Espresso > Machines > Could this be a...  
view previous topic | view next topic | view all topics
showing page 1 of 3 last page next page
Author Messages
OliveOil
Senior Member
OliveOil
Joined: 20 Jan 2008
Posts: 65
Location: WI
Expertise: Just starting

Espresso: NS Oscar
Grinder: Vario-W
Drip: Breville YouBrew
Posted Sun Mar 30, 2014, 3:40pm
Subject: Could this be a bad pressurestat in my Oscar?
 

I think my Oscar sometimes "sticks" while it's heating up.  I'll hear a long hizzing sound, then a huge poof of wet steam will loudly come out the top of the machine, blowing the outlet breaker.  

Could this be a bad pressurestat?  The safety thermostat button isn't popping when this happens.

Let me add that this is a older Oscar (no Sirai).
back to top
 View Profile Link to this post
OliveOil
Senior Member
OliveOil
Joined: 20 Jan 2008
Posts: 65
Location: WI
Expertise: Just starting

Espresso: NS Oscar
Grinder: Vario-W
Drip: Breville YouBrew
Posted Sun Mar 30, 2014, 4:04pm
Subject: Re: Could this be a bad pressurestat in my Oscar?
 

Maybe I'd need a new safety thermostat, too.  Seems like it should be triggered so the machine doesn't explode in the first place.
back to top
 View Profile Link to this post
Imtiredofbadcoffee
Senior Member


Joined: 2 Mar 2014
Posts: 6
Location: fleetwood, pa
Expertise: Just starting

Grinder: Baratza Forte
Posted Sun Mar 30, 2014, 4:56pm
Subject: Re: Could this be a bad pressurestat in my Oscar?
 

When an outlet breaker pops it means your machine  has a short circuit.  The first thing you should check is your heating element.  A heating element is a loop of hollow metal.   Inside this loop is an electric wire connected to 120 VAC.  An insulating material keeps the electric  wire from touching the metal loop.  Over time the water in the boiler will corrode the metal loop, water will permeate thru the insulating material  to the electric wire and poof goes the circuit breaker.   Some water might actually be leaking out the end of the element.  You need to check the elment with a multimeter.
back to top
 View Profile Link to this post
OliveOil
Senior Member
OliveOil
Joined: 20 Jan 2008
Posts: 65
Location: WI
Expertise: Just starting

Espresso: NS Oscar
Grinder: Vario-W
Drip: Breville YouBrew
Posted Sun Mar 30, 2014, 5:41pm
Subject: Re: Could this be a bad pressurestat in my Oscar?
 

Hi!

The element is good (already tested with a multimeter).  Though, it was tested a while before this problem started happening.  

I'll tear it out and check again.
back to top
 View Profile Link to this post
Imtiredofbadcoffee
Senior Member


Joined: 2 Mar 2014
Posts: 6
Location: fleetwood, pa
Expertise: Just starting

Grinder: Baratza Forte
Posted Sun Mar 30, 2014, 6:17pm
Subject: Re: Could this be a bad pressurestat in my Oscar?
 

Did you measure from element electrical contact to to boiler?  The internal element wire may stiill be good, the path to ground could be water leaking into the element thru the insulation.  Or maybe it is somewhre else, but it is a short if the wall breaker is popping.
back to top
 View Profile Link to this post
skydragondave
Senior Member


Joined: 18 Feb 2013
Posts: 167
Location: Ontario, Canada
Expertise: Professional

Espresso: Commercial Only
Grinder: Commercial Only
Roaster: Has Garanti HG5
Posted Mon Mar 31, 2014, 4:36am
Subject: Re: Could this be a bad pressurestat in my Oscar?
 

The good samaritan above me I believe has been led astray by your terminology.
The loud steam escaping from your machine is coming from your boiler safety valve. I assume this is what you're calling the "outlet breaker" as an opposite to the "vacuum breaker" which your machine does not have. If your heating element was shorted it likely would not operate at all.
You could have one of two problems: either a faulty pressurestat, or a faulty or weak boiler safety valve. What you need to do is observe the boiler pressure gauge as your machine is heating up and note whether the pressure is rising beyond 1.5BAR. It should not rise beyond 1.3 during use.
If your pressure is rising abnormally, the pressurestat needs to be adjusted or replaced. If steam is escaping from the safety valve at normal pressures, replace the valve. Preferably with one that has been calibrated and sealed. Most manufacturers recommend replacing this valve every two years at minimum to prevent an explosion due to failure.
A more remote possibility is that the boiler is overfilling due to a malfunctioning autofill circuit or scale-covered fill probe. If this is happening then you likely have a lot of scale accumulation in the boiler and it will require immersion descaling to correct it. Hopefully you have been using softened water to feed your machine and this is not the case.
back to top
 View Profile Link to this post
calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,722
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 Mon Mar 31, 2014, 12:50pm
Subject: Re: Could this be a bad pressurestat in my Oscar?
 

Another possibility for the outlet breaker is that when the safety valve vents excessive pressure from the machine, it wets the electrics inside the machine, causing a short circuit and then blows the circuit breaker in the house. When the machine dries again, the short is gone and it powers on as normal.

The heater element would not be the first place I would look for a problem.

As above, one or both the pstat and safety valve could be at fault.

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
back to top
 View Profile Visit website Link to this post
OliveOil
Senior Member
OliveOil
Joined: 20 Jan 2008
Posts: 65
Location: WI
Expertise: Just starting

Espresso: NS Oscar
Grinder: Vario-W
Drip: Breville YouBrew
Posted Mon Mar 31, 2014, 4:13pm
Subject: Re: Could this be a bad pressurestat in my Oscar?
 

calblacksmith Said:

Another possibility for the outlet breaker is that when the safety valve vents excessive pressure from the machine, it wets the electrics inside the machine, causing a short circuit and then blows the circuit breaker in the house. When the machine dries again, the short is gone and it powers on as normal.

The heater element would not be the first place I would look for a problem.

As above, one or both the pstat and safety valve could be at fault.

Posted March 31, 2014 link


Thanks!  The machine doesn't do this all the time.  It's quite random.  I think I'll start with the pstat and safety valve first.
back to top
 View Profile Link to this post
Imtiredofbadcoffee
Senior Member


Joined: 2 Mar 2014
Posts: 6
Location: fleetwood, pa
Expertise: Just starting

Grinder: Baratza Forte
Posted Tue Apr 1, 2014, 2:32pm
Subject: Re: Could this be a bad pressurestat in my Oscar?
 

calblacksmith makes a very good point about moisture being a catylist for the tripping breaker.  Wetness across 120VAC terminals can cause arcing and trip a breaker.  Things that operate within the Oscar are the 3 way solenoid at the group head, the two way solenoid water level solenoid that controls boiler fill, the heating element, and the pump.

When you open the machine look at the wire terminals and wires leading into them.  You might find burned insulation or pitted black marks on the metal terminals.

Going back to my original comment about the element here is a link with pictures describing  how to measure an element for a short.

Click Here (www.orphanespresso.com)

Joe
back to top
 View Profile Link to this post
OliveOil
Senior Member
OliveOil
Joined: 20 Jan 2008
Posts: 65
Location: WI
Expertise: Just starting

Espresso: NS Oscar
Grinder: Vario-W
Drip: Breville YouBrew
Posted Thu Apr 3, 2014, 1:17pm
Subject: Re: Could this be a bad pressurestat in my Oscar?
 

Imtiredofbadcoffee Said:

calblacksmith makes a very good point about moisture being a catylist for the tripping breaker.  Wetness across 120VAC terminals can cause arcing and trip a breaker.  Things that operate within the Oscar are the 3 way solenoid at the group head, the two way solenoid water level solenoid that controls boiler fill, the heating element, and the pump.

When you open the machine look at the wire terminals and wires leading into them.  You might find burned insulation or pitted black marks on the metal terminals.

Going back to my original comment about the element here is a link with pictures describing  how to measure an element for a short.

Click Here (www.orphanespresso.com)

Joe

Posted April 1, 2014 link

Thanks for the link, Joe!  

I took the lid off yesterday and turned the machine on.  It took a good 8 hours before the loud hissing from the safety valve occurred.  Normally it would loudly release steam for a good 30+ seconds and then trip the circuit breaker, but this time (without the cover) the breaker did not trip.  

I'll post a few pics of the innards when I get home tonight.  Maybe somebody will see pitting that I'm not seeing.
back to top
 View Profile Link to this post
showing page 1 of 3 last page next page
view previous topic | view next topic | view all topics
Discussions > Espresso > Machines > Could this be a...  
New Topics updated topics   New Posts new posts   Unanswered Posts new unanswered     Search Discussion Board search   Discussion Board FAQ faq   Signup sign up  
Not Logged in: Log In to Postlog in
Discussions Quick Jump:
Symbols: New Posts= New Posts since your last visit      No New Posts= No New Posts since last visit     Go to most recent post= Newest post
Forum Rules:
No profanity, illegal acts or personal attacks will be tolerated in these discussion boards.
No commercial posting of any nature will be tolerated; only private sales by private individuals, in the "Buy and Sell" forum.
No SEO style postings will be tolerated. SEO related posts will result in immediate ban from CoffeeGeek.
No cross posting allowed - do not post your topic to more than one forum, nor repost a topic to the same forum.
Who Can Read The Forum? Anyone can read posts in these discussion boards.
Who Can Post New Topics? Any registered CoffeeGeek member can post new topics.
Who Can Post Replies? Any registered CoffeeGeek member can post replies.
Can Photos be posted? Anyone can post photos in their new topics or replies.
Who can change or delete posts? Any CoffeeGeek member can edit their own posts. Only moderators can delete posts.
Probationary Period: If you are a new signup for CoffeeGeek, you cannot promote, endorse, criticise or otherwise post an unsolicited endorsement for any company, product or service in your first five postings.
Cafe Solutions
Commercial sales and service, nationwide installation, equipment leasing options.
www.seattlecoffeegear.com
Home | Opinions | Consumer Reviews | Guides & How Tos | CoffeeGeek Reviews | Resources | Forums | Contact Us
CoffeeGeek.com, CoffeeGeek, and Coffee Geek, along with all associated content & images are copyright ©2000-2014 by Mark Prince, all rights reserved, unless otherwise indicated. Content, code, and images may not be reused without permission. Usage of this website signifies agreement with our Terms and Conditions. (0.359501123428)
Privacy Policy | Copyright Info | Terms and Conditions | CoffeeGeek Advertisers | RSS | Find us on Google+