Descaling removes mineral deposits that build up inside a Breville coffee maker as water is heated. If scale is allowed to accumulate, you may notice slower flow, weaker steam, inconsistent temperature, unusual noises, or changes in espresso quality.
The most important point is that Breville descaling procedures vary by model. Do not assume that a generic vinegar-and-water brew cycle is correct for every Breville machine. For espresso machines such as the Barista Express, use the descaling procedure and descaler specified for your model.
Quick answer: how to descale a Breville coffee maker
- Check your exact Breville model and its maintenance indicator.
- Use the descaling product and dilution specified in the manual.
- Enter the machine’s dedicated descale mode when the model has one.
- Run the solution through the coffee, steam, and hot-water circuits as directed.
- Rinse the water tank thoroughly.
- Refill with fresh water and complete the full rinse cycle.
For the Barista Express BES870, Breville’s current instructions use a dedicated descale mode and Breville descaling powder rather than a normal espresso extraction cycle.
Descaling vs. the cleaning cycle
On the Breville Barista Express, descaling and the cleaning cycle are not the same job. Descaling removes mineral scale from the water system. The cleaning cycle backflushes coffee oils and residue from the brewing system.
On the BES870, a solid CLEAN / DESCALE light indicates descaling is required, while a flashing light indicates the separate cleaning cycle. If your light is flashing, follow the cleaning-cycle instructions rather than starting a descale.
How to descale a Breville Barista Express BES870
The following process is for the Barista Express BES870. If you own another Breville model, use the same general principle but follow that machine’s manual for its button sequence and solution quantity.
- Prepare the solution. Dissolve one Breville descaling-powder sachet in about 34 fl oz / 1 liter of water and add it to the tank.
- Enter descale mode. With the machine off, press and hold the 2 CUP button and POWER button together. Allow the machine to heat until the relevant indicator lights are steady.
- Descale the coffee circuit. Press the 1 CUP button. The cycle runs for roughly 25 seconds.
- Descale the steam circuit. Turn the steam dial toward the steam position and allow the programmed cycle to run.
- Descale the hot-water circuit. Turn the dial toward the hot-water position and allow that cycle to run.
- Repeat the three circuits. Continue according to the machine instructions until the descaling solution has been used.
- Rinse thoroughly. Remove and rinse the water tank, refill it with fresh cold water, and repeat the coffee, steam, and hot-water steps to flush out descaling residue.
- Exit descale mode. Press POWER when the rinse is complete.
Breville also notes that the tank should not be removed or allowed to run completely dry during the active descaling sequence.
For the manufacturer’s procedure, see Breville’s Barista Express descaling guide.
Should you descale a Breville with vinegar?
For a Breville espresso machine, the safest default is to use the descaling product specified by Breville for your model. Some general coffee makers tolerate diluted vinegar, but Breville’s current Barista Express procedure is built around its descaling powder and dedicated descale program.
If your manual explicitly allows another solution, follow the manual. Otherwise, avoid substituting a homemade mixture simply because it works in a basic drip brewer.
How often should you descale?
There is no single interval that fits every Breville machine and every water supply. Hard water creates scale faster than softer water, and frequent use increases the amount of water moving through the machine.
A better rule is to follow the machine’s maintenance indicator and your model’s manual. Replacing the water filter on schedule can reduce scale buildup, but it does not eliminate the need to descale indefinitely.
Signs your Breville may need descaling
- Slower-than-normal water flow
- Reduced steam performance
- Hot-water flow becoming weak or inconsistent
- Temperature becoming less consistent
- A solid CLEAN / DESCALE indicator on models that use this signal
- Espresso quality changing even though your beans, dose, and grind have stayed the same
Not every flow or pressure problem is caused by scale. If your Barista Express still behaves abnormally after a proper descale, see our Barista Express pressure troubleshooting guide. If the issue is specifically the hot-water outlet, see why a Breville Barista Express may spit hot water.
What to do if the CLEAN / DESCALE light stays on
First confirm whether the light is solid or flashing. On the Barista Express, those states indicate different maintenance procedures. If you performed a cleaning cycle when the machine was actually asking for a descale, the indicator may remain because the required procedure has not been completed.
If you completed the correct descale sequence and the indicator still does not clear, repeat the fresh-water rinse and verify that you completed every coffee, steam, and hot-water stage. If the machine still behaves incorrectly, use Breville’s model-specific support documentation rather than repeatedly running descaler through the system.
After descaling: dial your espresso back in
Removing scale can change water flow compared with a heavily scaled machine. If your shots run faster or slower afterward, recheck your grind and dose rather than assuming something is wrong. Our Breville Barista Express settings guide gives a practical starting point for dialing the machine back in.
FAQ
Can I just run descaler through the group head?
Not on models whose descale program also treats the steam and hot-water circuits. Follow the full model-specific cycle so all relevant water paths are descaled and rinsed.
Is a cleaning tablet the same as descaler?
No. Cleaning tablets are used for the cleaning/backflush process. Descaling products remove mineral deposits from the water system. They solve different maintenance problems.
Can scale cause low pressure?
Scale can restrict water flow and affect performance, but grind size, dose, basket blockage, pump issues, and other causes can produce similar symptoms. Descaling should be one part of troubleshooting, not the automatic answer to every pressure problem.
Do I need to descale if I use a water filter?
Yes, eventually. A filter can reduce mineral buildup, but it does not guarantee that scale will never form. Follow the machine’s maintenance indicator and your model’s recommended schedule.
