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Giotto HX odd noises during pull
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Discussions > Espresso > Machines > Giotto HX odd...  
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jmaeng
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Joined: 12 Dec 2012
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Location: Ottawa
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Posted Mon Mar 3, 2014, 7:47pm
Subject: Giotto HX odd noises during pull
 

I recently moved from a Silvia to a used Giotto that I picked up a few months ago and it's been a huge upgrade for steaming and shot consistency. However I recently descaled the boiler (very little scale came out) and I noticed an occasional rattling or sputtering noise only when I pull a shot. This noise doesn't happen when I just run water from the grouphead. I have it open and can't tell where the sound is coming from.

Here's a sample video of the noise during a shot and a close up a hose but I'm not sure what it's for:

http://vimeo.com/88103158

http://vimeo.com/88114993

I don't have any experience with repairs on espresso machines and was wondering if anyone was familiar with the noise or steps to troubleshoot where the problem might be?  

Thanks for the help.
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fnacer
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Posted Mon Mar 3, 2014, 9:48pm
Subject: Re: Giotto HX odd noises during pull
 

I'm not familiar with your machine. But the issue appears to be linked to what is happening in that hose. So you'll need to figure out what it's connected to on the left and/or where the water goes to on the right.

Since the noise only occurs when you pull shots, my guess is that the tube connects to over pressure valve to the drip tray or water tank. The purpose of the OPV is to ensure that water reaching the group head stays below a given pressure. Depending on the model you have, you may be able to take it out, take it apart and soak it in descaler to remove whatever is lodged in it.

But first things first, check where that hose goes to.
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jmaeng
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Joined: 12 Dec 2012
Posts: 14
Location: Ottawa
Expertise: I like coffee

Espresso: Rancilio Silvia
Grinder: Baratza Vario-W
Drip: Aeropress, Clever, French...
Roaster: Behmor 1600
Posted Wed Mar 5, 2014, 5:53am
Subject: Re: Giotto HX odd noises during pull
 

fnacer Said:

I'm not familiar with your machine. But the issue appears to be linked to what is happening in that hose. So you'll need to figure out what it's connected to on the left and/or where the water goes to on the right.

Since the noise only occurs when you pull shots, my guess is that the tube connects to over pressure valve to the drip tray or water tank. The purpose of the OPV is to ensure that water reaching the group head stays below a given pressure. Depending on the model you have, you may be able to take it out, take it apart and soak it in descaler to remove whatever is lodged in it.

But first things first, check where that hose goes to.

Posted March 3, 2014 link

On the tubing on right goes to a T-junction connecting to the water tank one side and the OPV on the other. I'll take the OPV out and soak it to see if it makes a difference.
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calblacksmith
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calblacksmith
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Posted Wed Mar 5, 2014, 7:04am
Subject: Re: Giotto HX odd noises during pull
 

Things like this can be very hard to trouble shoot over the internet!
IMHO,it sounds more like a pump problem.
Does it make the noise when you use a back flush disc and no water is moving?
It could also be the 3 way valve opening and closing rapidly. Perhaps a loose connection?
There just isn't that much in the brew circuit that can make noise like that.

 
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jmaeng
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Joined: 12 Dec 2012
Posts: 14
Location: Ottawa
Expertise: I like coffee

Espresso: Rancilio Silvia
Grinder: Baratza Vario-W
Drip: Aeropress, Clever, French...
Roaster: Behmor 1600
Posted Wed Mar 19, 2014, 7:22am
Subject: Re: Giotto HX odd noises during pull
 

calblacksmith Said:

Things like this can be very hard to trouble shoot over the internet!
IMHO,it sounds more like a pump problem.
Does it make the noise when you use a back flush disc and no water is moving?
It could also be the 3 way valve opening and closing rapidly. Perhaps a loose connection?
There just isn't that much in the brew circuit that can make noise like that.

Posted March 5, 2014 link

I had a chance to work on the machine last weekend. I took the OPV apart and descaled but it still making the same sound. Just a side question on the OPV, should the center rod be raised and difficult to move or should it be springy and movable (see attached pic)? Just curious if I should replace it.

Just to answer your questions calblacksmith:

Does it make the noise when you use a back flush disc and no water is moving? - No, it generally doesn't make the sound when using the backflush disc. The Ulka pump was apparently recently replaced but it's certainly possible it could be a pump issue.

It could also be the 3 way valve opening and closing rapidly. Perhaps a loose connection? - Just to confirm the 3 way valve, is that number 38 or 40 on the part list diagram (http://biobug.org/coffee/giotto/diags/boiler-parts.jpg)? Are these parts something I should try to descale or order replacements?  

After pull a number of shots with the case open, I do notice that I hear a small click before the noise starts. Would there be any related parts (i.e solenoid, pressurestat) that would be related to starting the noise?

jmaeng: photo.JPG
(Click for larger image)
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jmaeng
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Joined: 12 Dec 2012
Posts: 14
Location: Ottawa
Expertise: I like coffee

Espresso: Rancilio Silvia
Grinder: Baratza Vario-W
Drip: Aeropress, Clever, French...
Roaster: Behmor 1600
Posted Mon Mar 31, 2014, 8:48am
Subject: Re: Giotto HX odd noises during pull
 

I descaled a few other pieces but after putting it all back together still makes the noise which only occurs when pulling a shot (not when running water or backflushing). It's good education to learn more about how the HX is put together.

I may start buying a few replacement parts, would anyone have any suggestions on which part I should start with given the problem? Any help would be appreciated.
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