Guide · Descaling and cleaning
How to descale a Sage Barista Pro
How to run the Sage Barista Pro descale cycle from the menu, step by step from Sage's own UK instruction book: what you need, when to turn the steam dial and the rinse.
The Sage Barista Pro descale cycle runs from the machine’s own menu. You won’t need to guess any button combinations, but you do have to be there to turn the steam dial when the screen asks. This guide follows Sage’s UK instruction book for the Barista Pro (model SES878), which we read on 3 Oct 2026. We haven’t tested this in person. Read how we compare.
If you’re still choosing a machine, see our Sage Barista Pro review or the Barista Express vs Barista Pro comparison.
When the Barista Pro needs descaling
The Barista Pro tells you itself. Sage says the LCD shows a DESCALE alert when a descaling cycle is needed.
Sage explains why it matters: over time, hard water leaves mineral deposits on the machine’s internal parts. That can reduce the brewing flow, brewing temperature and power, and change the taste of the espresso. Sage’s troubleshooting table also suggests a descale when water won’t come through and the machine is making a loud noise, along with several other flow problems.
What you need
- Descaler. Sage includes descaling powder in the Barista Pro box. To buy more, Sage UK sells “the Machine Descaler” in a pack of 6 single-dose sachets, at £16.95 at Sage UK, checked 3 Oct 2026. See it at Sage UK. The product page doesn’t list the Barista Pro by name, so check the pack’s compatibility before buying. Sage’s instructions don’t mention vinegar, so we’d stick to Sage’s descaler.
- An empty drip tray. Sage says the drip tray must be empty and in place before you start.
- A container. Sage’s steps don’t mention one, but the cycle runs water through the coffee, hot water and steam outlets, so it’s sensible to have one ready.
- Time to stay with it. You’ll need to turn the steam dial when the screen tells you to. Sage also warns that hot steam may be released, so take care.
Sage Barista Pro descale: step by step
These are Sage’s steps, put into our own words.
The descale cycle
- Empty the drip tray and put it back.
- Take out the water tank and remove the water filter. Sage says the filter must come out before you add descaler.
- Fill the tank to the DESCALE line and add the descaler. Put the tank back.
- Open the descale programme. Press MENU, turn the GRIND AMOUNT dial to DESCALE and press it to select. The 1 CUP button lights up.
- Press 1 CUP to start. The cycle has 3 stages: coffee, hot water and steam. The machine beeps after each one.
- Turn the steam dial when asked. When the screen tells you, turn the STEAM DIAL to the hot water position, and then to the steam position.
The rinse cycle
- Empty the drip tray again and put it back.
- Empty any descaling liquid left in the tank, fill it to MAX with fresh water and put it back.
- Press 1 CUP to start the rinse. It also has 3 stages, shown on the screen, with a beep after each. Turn the steam dial when the screen asks, as before.
- Wait for the final beep. The machine returns to READY mode.
- Rinse and dry the drip tray and water tank before putting them back.
Then fit a water filter again if you use one.
Who this isn’t for: owners of other Sage machines, which use different steps. See our guides to descaling a Sage Dual Boiler and descaling a Gaggia Classic Pro for other machines.
What to do if it gets stuck
The Barista Pro instruction book doesn’t explain what to do if the cycle is interrupted. The safest approach is:
- Check the screen. The cycle waits for you to turn the steam dial at certain points. If nothing seems to be happening, it may be waiting for that.
- Check the water tank. Sage’s troubleshooting table lists a tank that isn’t fully pushed down and locked in place as one reason water won’t flow.
- If it still won’t finish, contact Sage support rather than taking the machine apart.
How to descale less often
Sage’s instruction book doesn’t include a water hardness setting for the Barista Pro, so these are the main things you can do:
- Use the water filter. Sage puts a water filter in the box. Soak it in cold water for 5 minutes before fitting it, and replace it after 3 months, according to Sage.
- Use the right water. Sage says to use only cold mains water in the tank. It doesn’t recommend highly filtered, demineralised or distilled water, which it says can affect the taste and how the machine is designed to work.
- Descale when the alert appears. Don’t ignore the DESCALE message. Limescale left in the machine is behind several of the problems in Sage’s troubleshooting table.
Other cleaning on the Barista Pro
Descaling is only one job. Sage’s instruction book also covers a separate grinder cleaning routine that removes oil build-up from the burrs. You unlock and empty the hopper, remove the top burr and brush both burrs clean. For more on keeping an espresso set-up in good order, browse our espresso machines section.
FAQ
Where is the descale option on the Barista Pro? Press MENU and turn the GRIND AMOUNT dial until you reach DESCALE, then press the dial to select it.
Does the water filter need to come out? Yes. Sage says to remove it before adding the descaler.
Why does the machine stop partway through? It’s waiting for you. Sage says to turn the steam dial to the hot water and steam positions when the screen tells you to, during both the descale and the rinse.
What comes in the box for descaling? Sage lists descaling powder among the Barista Pro’s accessories.