How to set the water buttons on the La Marzocco GS3 AV | Step-by-step guide for perfect espresso shots
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How do you set the water volume on the La Marzocco GS3 AV?
The La Marzocco GS3 is one of the most beloved espresso machines among serious home baristas. With its dual boilers, PID temperature control, and professional-grade performance, this machine offers everything you need for ultimate espresso control. But how do you adjust the water volume—also known as shot sizes—using the GS3's buttons?
This blog explains step-by-step how to set the water buttons on the La Marzocco GS3 AV (Automatic Volumetric), including tips for optimal results.
📌 Important: This only applies to the GS3 AV
The La Marzocco GS3 is available in two variants:
- GS3 AV – automatic volumetric dosing via buttons
- GS3 MP – manual paddle control
The instructions below apply only to the GS3 AV .
🔧 Step-by-step: how to program the water quantity per button
1. Allow the machine to warm up completely
Before programming, make sure the machine is properly warmed up and ready to use. This guarantees accurate measurements.
2. Activate the programming mode
- Press the 'continuous flow' button (usually the right button without preset volume) for 3 seconds until the display starts flashing or the programming mode is activated.
3. Select the button you want to set
- Press the button (e.g. for a single or double espresso) that you want to program.
- The pump starts automatically and the water starts flowing.
4. Run the correct amount of water
- Place a cup with a precision scale under the brewing unit.
- Let the water run until the desired weight is reached (for example 36 g for a double espresso ).
- Then press the same button again to stop the shot.
The machine now stores the volume via the internal flow meter.
5. Repeat for other buttons
Set the other knobs to your desired volumes in the same way (e.g. ristretto, lungo, bypass water).
6. Exit programming mode
- Press the 'continuous' button again for 3 seconds or wait until the machine automatically returns to normal mode.
💡 Tips for setting perfect volumes
- Use a precision scale under your cup while programming.
- Ensure consistent grind size , tamping , and coffee type during setup.
- You can always adjust the set volumes later.
More than just buttons: the power of the GS3
In addition to the adjustable shot volumes, the GS3 AV offers many more advantages:
- Double boilers for optimal temperature stability
- PID control for precise temperature control
- Saturated group head for consistent shots
- La Marzocco Home App to manage settings remotely
This machine gives you professional-level control — right in your own kitchen.
Frequently Asked Questions
Can I set up the GS3 with my phone?
Yes! The GS3 works with the La Marzocco Home App (iOS & Android). This allows you to program start-up times, set temperatures, and track statistics, among other things.
What if I set the wrong amount?
Don't worry, you can re-enter programming mode and adjust the volume at any time.
What is a good starting setting for espresso?
A good starting point is, for example, 18g coffee in, 36g espresso out for a double shot (1:2 ratio).
Conclusion
The buttons on the La Marzocco GS3 AV are easy to configure, provided you follow the correct steps. Whether you're working with single or double espressos, lungos, or other profiles, the programmable shot sizes give you the precise control you need.
Do you have any questions about your GS3, or would you like to learn how to adjust pre-infusion, temperature, or pressure? Let us know, and we'll be happy to help!
✅ Want to learn more about the GS3?
View detailed information at lineamini.nl .
