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Gaggia coffee - slow water flow
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caffeine_demon
Senior Member


Joined: 10 Oct 2012
Posts: 3
Location: uk
Expertise: I love coffee

Posted Wed Oct 10, 2012, 2:36am
Subject: Gaggia coffee - slow water flow
 

Hi guys,

I have just set up my gaggia coffee after moving, and the water flow is extremely slow.

it'S the flow through the brewhead that is running so slowly - the wand's water flow is fine, and it still runs slowly with no portafilter in place, so it isnt the coffee! - It's taking about 2 minutes to pour a shot glass worth.  The pump itself sounds very quiet, but as mentioned, the wand is fine.

Any ideas what might be causing this?
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dyqik
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Joined: 7 Oct 2011
Posts: 383
Location: Cambridge, MA
Expertise: I love coffee

Espresso: Bezzera BZ07 PM
Grinder: Baratza Virtuoso Preciso...
Vac Pot: Cona D
Drip: Bona-Vita, CCD, Aeropress.
Roaster: Gene Cafe, Modded Poppers
Posted Wed Oct 10, 2012, 7:17am
Subject: Re: Gaggia coffee - slow water flow
 

Coffee residue behind the shower screen is the most likely culprit.  Take the screen off and have a look and clean.  I don't think the Coffee has a three way valve (there'll be a pipe from the group area to the drip tray if it does), so back flushing is out.  You might also want to descale it after cleaning - the move might have shifted some scale flakes into the group valve/boiler outlet area that's now blocking the flow.  

Also check the hoses in the tank and inside for kinks - moving the machine might have shifted something inside.
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caffeine_demon
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Joined: 10 Oct 2012
Posts: 3
Location: uk
Expertise: I love coffee

Posted Wed Oct 10, 2012, 12:43pm
Subject: Re: Gaggia coffee - slow water flow
 

I decided to give it a good clean, so bought some allen keys and screwdrivers (the others are still at mum n dads!)

I get the shower screen off and give that a good clean, and attempt to get the allen screws out..


I'm gonna need a better allen key - the poundland ones are very small so you can't get enough purchase to undo it!

I'll try again at the weekend - in the meantime, the water flow is up from almost non existant to painfully slow!
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dyqik
Senior Member


Joined: 7 Oct 2011
Posts: 383
Location: Cambridge, MA
Expertise: I love coffee

Espresso: Bezzera BZ07 PM
Grinder: Baratza Virtuoso Preciso...
Vac Pot: Cona D
Drip: Bona-Vita, CCD, Aeropress.
Roaster: Gene Cafe, Modded Poppers
Posted Wed Oct 10, 2012, 1:04pm
Subject: Re: Gaggia coffee - slow water flow
 

Getting the dispersion block off (the bit held on with Allen screws) is a right pig if it hasn't been removed for a while.  You have to take the gasket off with it, and could damage it, so be careful (or buy a spare now, they aren't expensive).

You could try putting a coffee cleaner through the machine, but it needs to be safe for use with aluminium boilers.  I can't remember which one is the right one for that right now.
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tracerbullet
Senior Member
tracerbullet
Joined: 13 Feb 2012
Posts: 168
Location: Saint Paul
Expertise: I love coffee

Posted Fri Oct 12, 2012, 10:06am
Subject: Re: Gaggia coffee - slow water flow
 

Agreed, take the screen off first and check behind it. Should just be a screwdriver bit to do it.

Next up take the thick round block off, w/ the allen wrenches (2 cap screws, 5mm if I recall correctly). Agreed it can be a bear, you may need to partially put the shower screen screw back in and use that w/ some other kind of leveraging setup to get things apart.

Clean everything you see - the back of the screw and the top and bottom of the round blocky thing including where the water passes through it.

That will likely solve the problem, if not then you will have to go further upstream, to remove scale in or near the boiler.
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caffeine_demon
Senior Member


Joined: 10 Oct 2012
Posts: 3
Location: uk
Expertise: I love coffee

Posted Sat Oct 13, 2012, 3:12pm
Subject: Re: Gaggia coffee - slow water flow
 

got it all undone and descaled (didn't have any descaler on hand, so I used orange juice!!) and it's all running nicely now!

Now I need to find some good coffee in birmingham.....
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