The espresso cannot be dialled in
Every adjustment overshoots: the shot is either far too fast or far too slow, with nothing usable in between.
Applies to: Espresso machine, Espresso
Why a shot can refuse to settle
CoffeeHQ explanation
Dialling in assumes one thing above all: that a small change at the grinder produces a small, repeatable change in the shot. When every adjustment overshoots, with the shot gushing at one setting and choking at the next, that assumption has failed somewhere. The task is to find where, and it is usually not in the grind setting you are fighting with.
There are four places it fails. The grinder may reach espresso fineness without being able to move in small steps once it is there. The puck may be channelling, so that shot time reflects how the bed broke up and not how fine the coffee is. Coffee left in the grinder from the previous setting may be contaminating each new dose. Or the coffee itself may be changing faster than you are adjusting, as very fresh coffee does from day to day.
Causes, most likely first
There are 4 likely causes, listed with the most probable first. Work down the list and change one thing at a time, so that when the problem goes away you know which change fixed it.
Cause 1 of 4 · Commonly the cause
The grinder has no usable adjustment range at espresso fineness
- How to check
- Does one click take the shot from too fast to too slow?
- What to change
- Many grinders reach fine but cannot adjust finely within it. Check what one step actually changes at your setting.
Cause 2 of 4 · Commonly the cause
Channelling rather than a wrong grind setting
- What to change
- Sour and harsh simultaneously points to an uneven puck. Fix distribution and tamp before adjusting further.
Cause 3 of 4 · Commonly the cause
The grinder was not purged after the adjustment
- What to change
- Run a small amount through and discard it before judging a new setting.
Cause 4 of 4 · Reported, not independently verified
Very fresh or very old coffee
- What to change
- Coffee within a few days of roast degasses rapidly and moves day to day; very old coffee resists less at any setting.
If none of these fixes it
Check the cleaning and descaling guide. Equipment that needs maintenance can cause several of these symptoms at once, and no change of recipe will correct it.
Work through it for your setup
The causes above are general. These go to the part of a diagnostic that takes this symptom one check and one change at a time.
- Espresso still runs fast with the grinder at its finestThe possibilities, the quickest check and one thing to change first
- A tiny adjustment swings the shot from gushing to chokingThe possibilities, the quickest check and one thing to change first
- Dialling in espresso: limits outside technique
Stop adjusting and pull the same shot three times
Choose one setting, purge the grinder, and pull three shots at exactly the same weighed dose and the same yield, changing nothing. If the three times land within a few seconds of each other, your process is repeatable and the problem is the size of the grinder's steps. If they are scattered, with one at fifteen seconds and another at forty, no setting was ever going to work: the variation is coming from the dose or the puck, and that is what to fix.
This costs three shots and replaces a morning of guessing. It also tells you which of the two very different problems you have.
When the grinder's steps are too large for espresso
Many grinders are sold as capable of espresso because they can grind fine enough, which is a different thing from being adjustable finely enough. If one step takes a shot from twenty seconds to forty-five, the setting you need lies between two clicks and the grinder cannot stop there. The workable answers are to hold the grind at the faster setting and raise the dose by half a gram at a time, which adds resistance in smaller increments than the grinder can; to see whether your model can be made stepless or shimmed, as some can; or to accept that it is a filter grinder. It is not a fault in your technique.
Easily confused with
- Channelling — If shots at one setting vary wildly and taste sour and harsh together, the puck is the problem. A grinder with coarse steps gives consistent shots that are consistently wrong.
- A single misleading shot after an adjustment — One odd shot after changing the setting is retained coffee, and purging cures it. This page is for when it happens every time.
- A pressurised basket — If no grind change makes any difference at all, turn the basket over. A single exit hole means the basket, not the coffee, is setting the flow.
What not to change at the same time
Do not change grind and dose in the same shot while you are trying to find out what is wrong. Once the three-shot test has told you the grinder's steps are the limit, dose becomes your fine adjustment, and then the grind stays fixed.
How to tell it is fixed
Three shots in a row at one setting finish within a few seconds of each other, and you can reach a time inside your target range by an adjustment small enough to make deliberately.
If that changed nothing
If repeated shots are consistent and still either gush or choke with nothing between even after adjusting dose, check the coffee's roast date. Coffee within a few days of roasting can move faster than you can follow, and very old coffee may not slow down at any setting.
Espresso dial-in assistant — Enter the three repeated shots one after another. If they disagree with each other at one setting, the assistant will say that evenness, not grind, is the thing to fix.
Related issues
Work it out
Interactive tools that take you through this one change at a time.
- Espresso dial-in assistantWork out which single variable to change next, and what to expect when you change it.
- Grind-size guideFind a sensible grind starting point for a method, and know which way to move it.
- Grinder selectorWork out what kind of grinder your brewing actually needs, and which specifications matter for it.
- Brewing variable explorerUnderstand what each brewing variable actually moves — and what it drags along with it — before you change anything.
- Make my coffee betterSay how you brew and what you noticed, and get the likely causes, the quickest check, and one thing to change first.
Learn the technique
Step-by-step guides to the skills this problem comes from.
- Dialling in espressoFind the grind setting and recipe that make a particular coffee taste as intended, and be able to return to it.
- Adjusting grind sizeMove the grind in the right direction by a useful amount, and know what to expect from the change.
- Resting roasted coffeeLet a fresh roast settle to the point where it brews predictably, without waiting until it has gone flat.