How-to · Descaling
How to descale a Breville Bambino (and Bambino Plus)
The Bambino and Bambino Plus signal when descaling is due via the alternating button flash sequence (the manual calls this the "descale alert"). The cycle itself is built into the machine, but you have to provide the descaling solution and a free 15 minutes — interrupting it midway can leave residual descaler in the boiler, which is the most common way owners ruin a shot the morning after.
Breville officially recommends its branded descaler. In practice, a food-safe citric or lactic acid descaler at the right dilution does the same job. What matters is that you flush the boiler thoroughly after the cycle — twice if you smell anything acidic.
What you'll need
-
Espresso machine descaler (Breville-branded or citric/lactic acid blend)
Do not use white vinegar — the acetic acid is too aggressive on aluminium boilers over time, and the smell lingers.
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Clean water (filtered if your tap is hard)
You will need to refill the tank 2-3 times for the rinse cycle.
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Empty container (1 litre capacity minimum)
Place under the group head and steam wand to catch the discharge.
Step-by-step
- Step 1
Empty the drip tray and confirm the machine is cool
Power off, unplug, and let the Bambino cool for at least 30 minutes if you have used it that morning. Descaling on a hot machine is unsafe and the heating elements should not be cycling during the chemical contact phase.
Remove the drip tray and dump it. Remove the portafilter from the group head — descaling is a no-portafilter operation.
- Step 2
Mix the descaling solution in the water tank
Fill the water tank to the "DESCALE" line (marked on the inside of the tank) with cool water, then add the descaler powder or liquid per the product's dosage instructions. For Urnex Dezcal, that is one packet per fill. Slot the tank back into the machine.
Do not exceed the dosage. Higher concentration does not descale faster — it just leaves more residue you then have to flush.
- Step 3
Enter descale mode
With the machine off, hold the Power button plus the 1-cup and 2-cup buttons simultaneously for about 3 seconds. The buttons will flash in sequence indicating descale mode is active.
Press the 1-cup button once to start the cycle. The Bambino will pump the solution through the group head and steam wand alternately over roughly 7-10 minutes. Do not walk away — if the tank empties before the cycle completes, the pump runs dry.
- Step 4
Refill and run two rinse cycles
When the descale cycle finishes, the machine signals with a steady flash. Empty the discharge container, rinse the water tank thoroughly (no soap), and refill with fresh clean water to the MAX line.
Press the 1-cup button again to run the first rinse. When it finishes, refill and run a second rinse. The Bambino exits descale mode automatically after the rinse cycles.
- Step 5
Pull a sacrificial blank shot
Lock in an empty portafilter (with the pressurized basket is fine) and pull a 30-second water shot. Smell it. If there is any chemical or acidic note, run another full tank of clean water through the group head before you pull coffee.
This is the step most owners skip and then wonder why the next espresso tastes off.
Common mistakes to avoid
- Using white vinegar instead of a proper descaler — over time the acetic acid corrodes internal aluminium components and leaves a lingering smell that takes 5+ rinse cycles to fully clear.
- Skipping the second rinse cycle and pulling a shot immediately after the first rinse — descaler residue affects taste and is not safe to drink.
- Letting the tank run dry mid-cycle — the pump can lose prime and you will need to re-prime by holding the steam knob open for 30 seconds with the tank refilled.
- Descaling on a schedule rather than when the descale light comes on — over-descaling wears the boiler seals faster than scale accumulation would.
Frequently Asked Questions
How often does the Bambino need descaling?
The machine tracks shot count and water hardness and signals when descale is due — typically every 200-400 shots, which is roughly every 2-4 months for daily users. If your water is very hard (>10 grains per gallon) the alert may trigger sooner.
Can I use white vinegar to descale my Bambino?
Breville advises against it and so do we. Vinegar (acetic acid) is more aggressive than the citric/lactic acid descalers designed for espresso machines, and the smell takes many rinse cycles to clear. A purpose-made descaler is $15-20 and lasts a year or more of household descaling.
My shot tastes weird after descaling — what happened?
Almost certainly residual descaler in the boiler. Run two more full tanks of clean water through the group head (without descale mode — just normal water shots). If the taste persists for more than 24 hours, contact Breville support; you may have a stuck check valve.
Does descaling void the Bambino warranty?
No — descaling with an approved descaler is part of normal maintenance and Breville expects owners to do it. What can void the warranty is using non-approved chemicals (e.g. bleach, vinegar in excessive quantities) or opening the machine to clean internal components.
Last reviewed: . We update this guide when the manufacturer publishes new maintenance documentation or when community consensus on best practice shifts.