This might just change your routine: Your Delonghi EC685 is producing sour espresso, and you’re not alone. The frustration of chasing flavor only to taste acidity is a common pitfall, but it’s fixable—if you’re willing to reevaluate your approach. The issue isn’t your beans or your grind, as you’ve already ruled out the basics. The problem lies in the delicate balance between extraction, water temp, and machine quirks. Let’s cut through the noise.
First, your water temp is set to maximum, but the Delonghi EC685’s boiler often overshoots the ideal 195–205°F range. Overheating accelerates extraction, amplifying acidity. Try manually adjusting the temperature using a thermometer—aim for 198°F. Second, your pre-infusion technique might be overworking the puck. Pressing the brew button three times forces extra water through the filter, but this can over-saturate the coffee, leading to a sharp, sour profile. Instead, reduce pre-infusion time by one press and let the machine’s natural flow take over.
Grind size is another culprit. You mentioned grinding finer leads to choking, but a slightly coarser grind could improve extraction. Experiment with a 17–18g dose and a 30-second shot. The yield of 36g suggests a 1:2.1 ratio, which is on the edge of under-extraction. Slightly increasing the dose to 18g might help, but only if the grind is adjusted to compensate. Also, check your group head for mineral buildup—scale can alter water chemistry and intensify acidity.
The final piece? Your beans. While you’re using Delonghi Bianca Latte, its medium roast might not be suited for your machine’s pressure. Try a darker roast or a single-origin bean with lower acidity.
Key points: Adjust water temp to 198°F, reduce pre-infusion presses, experiment with a 17–18g dose and 30-second shot, and check for group head scale.
Key points: Adjust water temp to 198°F, reduce pre-infusion presses, experiment with a 17–18g dose and 30-second shot, and check for group head scale.
What’s your go-to fix for sour espresso? Share your tricks below.
Questions & Answers
How to fix sour espresso on Delonghi EC685?
Lower water temp to 198°F. Overheating increases acidity. Use a thermometer to adjust manually.
Why is my Delonghi EC685 espresso sour?
High water temp causes over-extraction. Aim for 198°F. Check boiler settings and manual adjustments.
Information sourced from industry reports and news outlets.
