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Slow flow rate from Gaggia Classic group head (pawb.social)

submitted 1 week ago by OmegaMouse@pawb.social to c/coffee@lemmy.world

11 comments fedilink hide all child comments

I've had a Gaggia Classic for a few years and over the last few months I've been having issues with the flow from the group head.

I think it might be an issue with the solenoid valve. There was some guidance I saw online about flicking rapidly from the group head to the steam wand, as this forces water through and clears any blockages. And yes this does seem to work - if I rapidly flick the switches the water suddenly flows a lot faster from the group head. But it's not a permanent fix.

I've descaled it several times. Is there something else I can do, or does the valve need replacing?

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[–] sxan@midwest.social 4 points 1 week ago (1 children)

I don't know the Gaggia, but on my Micro Casa I take the head group apart every few years and clean it. A surprising amount of buildup clogs the head. Can you take that apart and get the screen out to clean it?

It's part of the recommended regular maintenance in the instructions of my machine. I've not noticed any build up since I've been using a puck screen. I still have to take the thing apart to grease it every couple of years, but the group head has been much more clean.

If you do get it apart and cleaned, and it does help, and you're not using a puck screen, I recommend getting one to help keep the head clean. They're cheap.

[–] OmegaMouse@pawb.social 3 points 1 week ago

Yeah it might be a good idea to take it apart. I don't think the head or screen is the issue, as once the water starts flowing (after using the switching trick) everything flows well through the head. I'll have a look into puck screens though!

[–] Spokesyon@lemmy.world 2 points 1 week ago (1 children)

I wasn’t using the correct water, and after about two years I needed to replace my valve. After inspection my boiler was also beyond descaling and the steam valve was drippy. I replaced those parts because I could but only the solenoid valve was required. FWIW there are videos on how to clean the valve (after removing it) but they didn’t work for me.

[–] OmegaMouse@pawb.social 1 points 1 week ago (2 children)

Thanks for this - I could certainly take it apart and try and clean everything individually. Are there any particular guides you used when doing this?

What kind of water do you use now? Distilled or through a brita filter?

[–] Spokesyon@lemmy.world 2 points 1 week ago

https://youtu.be/0ipvBdWaVzQ

I used this, but I’ve installed the shades pid, shades pressure gauge, and a dimmer mod so I was fairly familiar with the innards.

Consumer carbon filters don’t really remove enough hardness to be effective. For convenience I use distilled gallons and third wave espresso packets. There are cheaper methods though.

[–] Spokesyon@lemmy.world 2 points 1 week ago (1 children)

Do not use straight distilled water though. It will damage the machine and taste very very bad.

[–] OmegaMouse@pawb.social 1 points 1 week ago (1 children)

Would you use 50/50 distilled to tap water for example?

[–] Spokesyon@lemmy.world 2 points 1 week ago

There’s a bunch of deep dives on water chemistry, but I mix third wave water packets into one gallon of distilled water.

[–] anytimesoon@feddit.uk 2 points 1 week ago (1 children)

In my experience, this is a sign that the solenoid has something inside it. Your best bet is to take it apart and do a full descale.

This video takes you through the whole process. https://www.youtube.com/watch?v=N9i-EH7qXOc

It's not as big a task as it might seem, and it will definitely get everything flowing again

[–] OmegaMouse@pawb.social 2 points 1 week ago

Thanks, yeah it does sound like the best option! Thanks for the link :)

[–] not_woody_shaw@lemmy.world 1 points 1 week ago

Do the flick back and forth thing WITH the descaling goop. A lot. Wait a couple minutes. Do it again. Repeat and repeat until someone complains about the noise.