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Giotto Boiler overfill during brew
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Discussions > Espresso > Machines > Giotto Boiler...  
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geardave
Senior Member


Joined: 18 Apr 2014
Posts: 3
Location: Los Angeles
Expertise: Just starting

Espresso: ecm giotto, profitec 700
Grinder: mezer mini
Posted Fri Apr 18, 2014, 6:24pm
Subject: Giotto Boiler overfill during brew
 

Hi All,
any advice?

have a ECM Giotto and regularly have an issue where during brewing the boiler pressure gauge starts dropping and the boiler is being overfilled as the pump runs.  

when this happens the shot is black coffee with no crema and then the boiler is too full and I get all kinds of issues like spitting water from steam wand and other stuff.

now that I know the behavior I can stop brewing if I see the pressure dropping and if I stop and start the lever a few times  then pull some water from the hot water wand and give it a minute to reheat....it clears up and works normally.  unfortunately if any one else uses the machine its a train wreck.

seems like a sticking valve or something but any suggestions would be great.

thanks in advance. I'm new here.
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SStones
Senior Member
SStones
Joined: 24 Nov 2012
Posts: 474
Location: Canada
Expertise: Professional

Espresso: Giga 5, ECM Giotto, Rocket...
Grinder: Anfim Milano-Best
Vac Pot: No  :(
Drip: Some $30 thing from Walmart
Roaster: I buy pre-roasted.
Posted Sun Apr 20, 2014, 4:56am
Subject: Re: Giotto Boiler overfill during brew
 

The most likely cause would be that the boiler-fill solenoid-valve is stuck open with a bit of calcium or other crud.
Running descaler through the valve could clear it out and get it working again. This would be the easiest fix, if it works.
Let machine heat as normal.
Shut machine off and let a couple cups of water out through the water wand.
Replace reservoir water with your descaling solution. The machine will pump this through the boiler-fill valve when you turn it back on and it tries to refill the boiler.
Obviously, once this is in your boiler, you will have to empty and refill your boiler a couple times to flush it all out.  You could do so just by heating it, shutting it off (So it won't be trying to refill while emptying), and letting the water out through the water-wand.

Though.  Since you might have to dismantle the boiler-fill solenoid's circuit to clean/replace it, you could also drain it through that hole in the belly of the boiler.
If the quick and easy descaling doesn't work, take the solenoid valve apart toi determine if a cleaning could work or if it will need replacing.
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geardave
Senior Member


Joined: 18 Apr 2014
Posts: 3
Location: Los Angeles
Expertise: Just starting

Espresso: ecm giotto, profitec 700
Grinder: mezer mini
Posted Sun Apr 20, 2014, 7:05am
Subject: Re: Giotto Boiler overfill during brew
 

Thanks! I'll give that a shot and see how it goes.
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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,670
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 Apr 21, 2014, 6:05am
Subject: Re: Giotto Boiler overfill during brew
 

Stephen, good call.

 
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!
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SStones
Senior Member
SStones
Joined: 24 Nov 2012
Posts: 474
Location: Canada
Expertise: Professional

Espresso: Giga 5, ECM Giotto, Rocket...
Grinder: Anfim Milano-Best
Vac Pot: No  :(
Drip: Some $30 thing from Walmart
Roaster: I buy pre-roasted.
Posted Tue Apr 22, 2014, 4:12am
Subject: Re: Giotto Boiler overfill during brew
 

I used to do this once every few years.  If it wasn't stuck open, it was clogged closed.  :)
Now I have a much larger solenoid valve in my older Giotto (ECM), it's been there for less than a year.  I'm curious to know in the next half decade if the larger solenoid will have fewer issues.
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geardave
Senior Member


Joined: 18 Apr 2014
Posts: 3
Location: Los Angeles
Expertise: Just starting

Espresso: ecm giotto, profitec 700
Grinder: mezer mini
Posted Fri Apr 25, 2014, 11:48am
Subject: Re: Giotto Boiler overfill during brew
 

Hi All,
Just to close the loop.

Although I do not regret descaling and it needed doing anyway...... the root cause was corroded spade connector blades on the fill solenoid valve. (high resistance) causing intermittent bad connection.

some wire brushing and TLC and all is well.

Thanks for the support!

D
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