With the machine switched off, press and hold the 2 CUP button, then press and hold POWER at the same time. That puts a Barista Express into descale mode. Dissolve one sachet of descaling powder in one litre of warm water, fill the tank, then run the solution through the group head, the steam wand and the hot water spout until the tank is empty. Refill with clean water and run the whole thing again to rinse. Allow about 30 minutes.
How often you do it depends on your water, not on the calendar. Roughly every two to three months across most of Australia, every six to eight weeks if you are on hard water in Perth's northern suburbs or parts of regional SA and the NT, and you can stretch it out in Melbourne, where the water is very soft.
We do not sell coffee machines and we do not repair them, so there is nothing in this for us either way. What we do have is a subscription full of people running Brevilles, and a founder who has owned most of the range and pulled a good number of them apart.
Most of what is written about descaling a Breville is either the manual restated, or a page with a descaler for sale at the bottom of it. Two things get left out every time: how often you should actually do it where you live, and whether the vinegar in your cupboard will do the job. Both of those are below.
Cleaning and descaling are two different jobs
They use different chemicals, they clean different parts of the machine, and doing one does not do the other. This is the single most common mix-up, and Breville's own indicator light is partly to blame, because one light covers both.
| Cleaning cycle | Descaling | |
|---|---|---|
| Removes | Coffee oils and grounds | Mineral scale from your water |
| Where | Group head, shower screen, portafilter | Inside the boiler, pump and pipes |
| Uses | A cleaning tablet and the grey cleaning disc | Descaling powder or solution in the tank |
| The light | Flashes | Comes on solid |
| How often | When the light says, roughly monthly | Every 6 weeks to 4 months, depending on your water |
A useful way to think about it: the cleaning cycle deals with what the coffee leaves behind, and descaling deals with what the water leaves behind. If you only ever run cleaning tablets, scale keeps building. If you only ever descale, your shots keep tasting like last month's coffee.
Which one first?
If both are due, run the cleaning cycle first and descale afterwards. The descale is a full flush of the whole water path, so you want it to be the last thing that runs through, not the first. On a Barista Express the cleaning cycle is a different button combination again: hold down POWER while you press and hold 1 CUP and 2 CUP together for three seconds.
How often, based on where you live
Every guide online gives you a number, and the numbers all disagree. Monthly, every two to three months, twice a year. They cannot all be right, because the thing that determines the answer is how much calcium and magnesium is in your tap water, and in Australia that varies enormously from one city to the next.
Here is what the water utilities themselves publish, measured as milligrams per litre of calcium carbonate.
| City | Hardness (mg/L) | How it rates | Descale about every |
|---|---|---|---|
| Melbourne | 9 to 38 | Very soft | 4 to 6 months |
| Darwin | 38 | Soft | 4 months |
| Canberra | 43 | Soft | 4 months |
| Sydney | 57 | Soft | 3 to 4 months |
| Brisbane | 71 to 130 | Moderately hard | 2 to 3 months |
| Perth, most metro suburbs | 42 to 130 | Soft to moderately hard | 2 to 3 months |
| Perth, northern coastal (Two Rocks, Yanchep, Neerabup) | 180 to 240 | Very hard | 6 weeks |
| Adelaide | Not published, varies by suburb | See below | Check yours |
The intervals in that last column are ours, not the utilities'. They assume a household pulling a few shots a day. Pull eight a day and shorten them.
The Adelaide problem
We are an Adelaide business, so this is the one we wanted to answer properly, and we cannot. SA Water does not publish a hardness figure for Adelaide anywhere we could find. Their pages state the 200 mg/L threshold and then hand you an address lookup tool.
There is a reason for the vagueness. Adelaide's supply is, in SA Water's words, "a blend of waters from the Happy Valley Reservoir, River Murray, other reservoirs across the Mount Lofty Ranges and waters produced at the Adelaide Desalination Plant." The mix changes by suburb and through the year, so one number for the city would be wrong most of the time.
What to do instead: put your postcode into SA Water's drinking water profile tool and read your own figure. It takes about a minute. Then use the table above to pick your interval. You will find numbers for Adelaide on other blogs, usually around 100 mg/L. None of them cite SA Water, so we are not repeating them.
What counts as hard
Two different scales are in use and they disagree in exactly the range most Australians live in. The World Health Organization calls anything under 60 soft, 60 to 120 moderately hard, 120 to 180 hard, and above 180 very hard. The Australian Drinking Water Guidelines instead say that scaling problems start above 200 mg/L.
That 200 mg/L figure is about hot water systems and plumbing, not coffee machines. The guidelines say hardness above 200 "may lead to excessive scaling of pipes and fittings". A hot water system holds litres and runs at 60 degrees. An espresso boiler holds a few hundred millilitres, runs hotter, and has a group head with passages the width of a drinking straw. Scale that a hot water service shrugs off will choke an espresso machine years earlier, which is why we work to the WHO bands rather than the plumbing threshold.
The cheapest thing you can do
Use the water filter in the tank and change it. The Barista Express manual is blunt about it: "Replacing the water filter every two months will reduce the need to de-scale the machine. If you live in a hard water area, we recommend you change the water filter more frequently."
Two months, not three, and most people run them for a year. A filter costs a fraction of a descale kit and far less than a service, and it is the difference between descaling every six weeks and every three months if you are on hard water.
Can you descale a Breville with vinegar?
You can. It is a bad trade, and the reason it is a bad trade is not the one usually given.
Vinegar is acetic acid, and acetic acid dissolves limescale. It genuinely works. Breville's own American blog tells people to run one part water to one part vinegar. The Australian manual for the Barista Express specifies a Breville descaling sachet dissolved in a litre of water, and does not mention vinegar at all, neither to recommend it nor to warn against it. So anyone telling you Breville forbids it is overstating the case.
Here is why we still do not do it.
- The taste stays. This is the real problem. Vinegar gets into the silicone and rubber in the water path and then comes back out for weeks. You will taste it in milk drinks in particular, as a thin sourness sitting underneath everything. It takes several full tanks of clean water to shift, and by then you have spent more time and water than a sachet would have cost.
- It is the wrong acid for the job. Descaling powders made for coffee machines are usually citric or sulfamic acid based, formulated against the specific mix of metals, seals and gaskets inside one. Acetic acid was formulated to go on chips.
- The saving is trivial. A sachet costs a few dollars, four to six times a year. That is not the line item worth economising on when the machine cost several hundred.
If you are going to do it anyway, dilute it to at least half water, never run it through the steam wand, and rinse with two full tanks of clean water afterwards rather than one. Then pull two shots and tip them out before you make anything you intend to drink.
You do not need the Breville branded sachet, incidentally. Any descaler sold for espresso machines will do the same job. What matters is that it was made for coffee machines rather than for kettles, jugs or bathrooms.
What the clean and descale light is telling you
One light, two meanings, and the manual explains it in a single line most people never read.
- Flashing means it wants a cleaning cycle. The machine counts your shots and asks at around 200.
- Solid means it wants a descale.
The light will not go off
Almost always this is because the cycle did not run all the way to the end. The machine only clears the counter when the full sequence completes, so if you stopped partway, emptied the tank early, or switched it off in the middle, it still thinks the job is outstanding. Run the whole thing again without interrupting it.
If it clears and then comes straight back on after a handful of shots, that is a different problem and usually points to the machine's internal count being out rather than to actual scale. That is a Breville support question, not something to keep descaling at.
Descaling a Barista Express, step by step
- Empty the drip tray and the water tank. Take the water filter out of the tank and leave it out. Descaler will wreck it.
- Dissolve one sachet of descaling powder in one litre of warm water, then pour it into the tank. Warm water, not hot.
- With the machine switched off, press and hold the 2 CUP button, then press and hold POWER at the same time. The power button flashes while it heats, then the power, 1 CUP, clean/descale and steam lights all sit solid. You are in descale mode.
- Put a container of at least two litres under the group head and the steam wand. It needs to be bigger than you think.
- Press 1 CUP to flush the coffee side. It runs for about 25 to 30 seconds.
- Turn the steam dial to steam for about 10 seconds, then back to vertical.
- Turn the dial to hot water for about 8 to 10 seconds, then back to vertical.
- Repeat steps five to seven until the tank is empty.
- Rinse the tank thoroughly and fill it to the max line with clean cold water. Then run steps five to seven again, right through the tank, to flush the descaler out. Do not skip this or shorten it.
- Press POWER to leave descale mode. Put a fresh water filter in, reassemble, and pull one shot and tip it out before you make a coffee.
Button sequences are not the same across the range. The Barista Touch and the Oracle prompt you through it on screen and do most of the thinking for you. The Bambino has no three button cleaning cycle at all, so its routine is different again. The Dual Boiler has two boilers to flush rather than one. The principle is identical everywhere, but check the sequence in your own manual rather than borrowing the Barista Express one, because pressing the wrong combination on some models puts you into a settings menu instead.
It stopped working after I cleaned it
This happens often enough that people search for it by name, and nobody writes about it. Almost always it is one of three things, and all three are fixable at home.
No water comes through the group head
The pump has lost its prime, usually because the tank ran dry during the cycle or a brand new water filter went in without being soaked first. A dry filter can block the intake. Take the filter out, fill the tank, reseat it firmly so the valve at the bottom engages, and run hot water through the spout for 20 or 30 seconds to pull the air out. Soak a new filter in water for five minutes before it goes in.
The pump is buzzing but nothing happens
Same problem, further along. Run the hot water spout rather than the group head, because it is the shorter path and clears air more easily. If that does nothing after a couple of attempts, stop. Running a pump dry repeatedly is how you turn a nuisance into a repair bill.
Shots taste wrong, sour or thin
Descaler residue, nearly always. Run another full tank of clean water through both the group head and the hot water spout, then pull two shots and throw them away. If it is still there after that, it is more likely your grind moved than anything chemical.
An undissolved tablet
If the cleaning tablet did not fully dissolve, bits of it sit under the shower screen and block the flow. Take the shower screen off, rinse it, and run the cycle again.
When to stop and call someone
We do not repair machines and do not take a cut from anyone who does, so there is no reason for us to talk this line up or down. Descaling, cleaning, filters, seals, the shower screen and the burrs are all owner jobs. Past that point, stop:
- Water leaking from inside the case rather than from the portafilter
- The machine tripping a breaker or an RCD, which is an electrical fault and not a coffee problem
- Not heating at all, or heating and then cutting out
- Any fault that needs the case opened
A machine still under warranty should go to Breville or an authorised service agent, not to a YouTube video, because opening it yourself is how you lose the warranty on a fault that was going to be covered.
Common questions
Can you descale a Breville coffee machine with vinegar?
Yes, it dissolves scale, and Breville's US blog even suggests a one to one mix with water. We avoid it because the taste lingers in the seals for weeks and descaling powder costs a few dollars. If you do use it, dilute it and rinse with two full tanks of clean water.
Should I clean or descale my Breville first?
Clean first, descale second. The descale flushes the entire water path, so it should be the last thing to run through the machine.
How do I reset the descale light on a Breville?
There is no separate reset. The light clears itself when a full cycle completes. If it is still on, the cycle almost certainly stopped early, so run it again from the start without interrupting it.
How often should I descale a Breville?
Every two to three months on typical Australian water, every six weeks on hard water such as Perth's northern coastal suburbs, and you can stretch to four to six months in Melbourne. Changing the water filter every two months lengthens the interval.
Can I clean a Breville without cleaning tablets?
You can do most of it. Take the shower screen off and scrub it, soak the portafilter and baskets in hot water with a dedicated espresso machine cleaner, and backflush with water using the blind disc. What you cannot properly replicate without a tablet is stripping the coffee oils out of the group head, so it is a stopgap rather than a substitute. Do not use dishwashing liquid, which leaves a soapy taste and is hard to rinse out.
Does the water filter actually matter?
On hard water it is the single highest value thing you can do, and Breville's own manual says replacing it every two months reduces how often you need to descale. On very soft water such as Melbourne's it matters much less.
Where the numbers came from
- Hardness figures: Melbourne Water, Sydney Water, Seqwater, Water Corporation, Icon Water and Power and Water.
- Scaling threshold and guidance: Australian Drinking Water Guidelines, hardness as calcium carbonate.
- Hardness classifications: World Health Organization, Hardness in Drinking-water.
- Adelaide supply blend and the address lookup: SA Water drinking water profile.
- Button sequences, filter interval and descaling instructions: the Breville Barista Express BES875 ANZ instruction manual.
Checked September 2026. Water hardness is measured continuously and these figures move, so treat them as the shape of the thing rather than as today's reading.
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