How to descale a coffee machine (2026)
Quick Answer
To descale a coffee machine, use the descaling method recommended by the manufacturer, run the solution through the machine as directed, then flush thoroughly with fresh water before making coffee again. The exact product, amount and programme vary by machine type, so check the manual or the brand’s support site first. Descaling removes mineral build-up that slows brewing, affects taste and can damage internal parts.
Overview
Descaling is routine maintenance for coffee machines that heat water, including pod machines, filter machines, bean-to-cup machines and many espresso machines. Over time, limescale from hard water builds up inside boilers, thermoblocks, pipes and valves. That build-up reduces water flow, makes the machine work harder, can alter brewing temperature and often gives poorer tasting coffee. A proper descale dissolves those mineral deposits so the machine can heat and pump water more normally again. The safest approach is to follow the maker’s instructions for your exact model, because some machines have an automatic descale programme while others need manual cycling and soaking. Many manufacturers also specify which descaling products are suitable and warn against using substances that can damage seals, metal parts or sensors. As a general rule, descale whenever the machine tells you to, more often if you live in a hard-water area, and sooner if you notice slower flow, unusual noises, incomplete cups, steam problems or a change in taste. Between descaling sessions, rinse removable parts, empty drip trays and grounds containers, clean milk systems promptly and refresh any water filter on schedule. If descaling does not restore normal performance, or if there are leaks, electrical faults or blocked internal parts, it is better to stop and get professional servicing.
Who this is for
People maintaining a domestic coffee machine at home, including pod, drip/filter, bean-to-cup and many espresso machines.
What you’ll need
- the machine’s user manual or official support instructions
- manufacturer-approved descaler or the exact descaling product recommended for your machine
- fresh water
- a large container or jug to catch discharged liquid if required
- a soft cloth
- access to a sink
Before you start
Check the machine type and the manufacturer’s descaling instructions before doing anything else. Some machines need the water filter removed first, some require a dedicated descale mode, and some manufacturers advise against household acids or unspecified cleaners. Empty capsules, beans where appropriate, used grounds, drip trays and any remaining water that the instructions say to remove. Make sure the machine is cool enough to handle safely, especially if it has just been steaming milk.
Step-by-step
- 1
Check the correct descaling method for your model
Find the user manual or official support page for your exact machine. Confirm whether it has an automatic descale programme, whether any water filter must be removed or replaced, and which descaling product is approved.
Why: Coffee machines differ internally. Using the wrong product or skipping model-specific preparation can damage components or leave the descale cycle incomplete.
- 2
Prepare the machine
Switch the machine off if the instructions require it, allow hot parts to cool, then empty the drip tray, used grounds container and capsule bin if fitted. Remove and rinse removable parts as advised. Place a suitable container under the coffee outlet and steam or hot-water wand if the process sends liquid through both.
Why: A clear, empty machine prevents overflow and ensures descaling solution can move through the relevant water paths.
- 3
Add descaling solution exactly as directed
Prepare the descaler using the product label and the machine instructions, then pour it into the water tank. If your machine uses a water filter cartridge, remove it first if the manufacturer says to do so.
Why: The correct product and preparation strength are important for dissolving scale without harming seals, sensors, aluminium parts or coatings.
- 4
Run the descale cycle or manual flow sequence
Start the machine’s descale programme if it has one. If it does not, run the solution through the brew and hot-water paths in the pattern described by the manufacturer, pausing only if the instructions tell you to. Keep the outlet container in place and monitor the process so it does not overflow.
Why: Scale often sits in several internal passages. Running the solution through the full water circuit gives it contact time where deposits actually form.
- 5
Rinse the system thoroughly with fresh water
When the descaling phase is complete, empty and rinse the water tank, fill it with fresh water, and run the required rinse cycle or repeated fresh-water flushes exactly as instructed. Empty the waste container as needed.
Why: Rinsing removes dissolved scale and any residual descaling chemical so it does not affect taste or irritate internal components.
- 6
Clean removable parts and reset any maintenance alert
Wash and dry the drip tray, grounds container, brew basket or other removable parts as suitable for your machine, then refit them. Reset the descale warning only if the machine asks for it or the instructions explain how.
Why: Finishing properly prevents stale residues building up elsewhere and keeps the maintenance reminder in step with actual care.
- 7
Make a test run before brewing coffee
Run plain water through the machine once more if needed, then brew hot water or a sacrificial first cup and discard it. Check that flow, sound and temperature seem normal.
Why: A final check helps confirm that any cleaner taste has gone and that the machine is functioning normally before you make a drink.
Why this works
Descaling works by dissolving mineral deposits left behind when hard water is heated. Removing that scale improves water flow and heat transfer, reduces strain on pumps and heating elements, and helps the machine brew more consistently.
Common mistakes to avoid
- Using vinegar, citric acid or a homemade mix when the manufacturer says not to
- Ignoring the manual and guessing the process for a machine with a dedicated descale mode
- Forgetting to remove or replace a water filter when required
- Stopping the cycle halfway through unless the instructions specifically say to pause
- Not rinsing thoroughly afterwards
- Resetting the descale light without actually descaling the machine
- Waiting until the machine is heavily scaled before taking action
Troubleshooting
The descale light stays on after descaling
Check whether your model needs a manual reset after the cycle. Repeat the official reset sequence from the manual rather than guessing button presses.
Water flow is still slow after descaling
Run the full manufacturer-approved descale process again if the manual allows it, then rinse thoroughly. If flow does not improve, the machine may have a blockage, failing pump or scale in a part that needs service access.
The machine tastes or smells of descaler afterwards
Empty the tank, refill with fresh water and repeat the rinse cycle until there is no remaining odour or taste.
The machine leaks during or after descaling
Stop using it, check that tanks, trays and removable parts are seated properly, and inspect visible seals for damage. If leaking continues, arrange servicing.
Steam wand performance is weak
Clean the steam wand tip and milk system first, then descale using the maker’s process if the steam circuit is included. If steam remains weak, professional attention may be needed.
Compare your options
Manufacturer-branded descaler
Best for: Most users, especially for automatic and premium machines
Pros: Most likely to match the machine maker’s requirements; lower risk of compatibility issues; support instructions often written around it
Cons: May cost more than generic products
Compatible descaler from a recognised appliance-care brand
Best for: Users whose manual allows equivalent descalers
Pros: Can be easier to find locally; may suit multiple appliances
Cons: You must verify compatibility carefully; unsuitable formulas can harm some machines
Built-in automatic descale programme
Best for: Machines designed with guided maintenance cycles
Pros: Usually simplest; covers the intended internal pathways; often prompts rinsing and reset steps
Cons: Still depends on using the right product and following the prompts exactly
Manual descaling process
Best for: Simple filter machines and models without an automatic cycle
Pros: Straightforward on basic machines; no need for software prompts
Cons: More room for user error; easier to miss soak or rinse stages
| Option | Best for | Pros | Cons |
|---|---|---|---|
| Manufacturer-branded descaler | Most users, especially for automatic and premium machines | Most likely to match the machine maker’s requirements; lower risk of compatibility issues; support instructions often written around it | May cost more than generic products |
| Compatible descaler from a recognised appliance-care brand | Users whose manual allows equivalent descalers | Can be easier to find locally; may suit multiple appliances | You must verify compatibility carefully; unsuitable formulas can harm some machines |
| Built-in automatic descale programme | Machines designed with guided maintenance cycles | Usually simplest; covers the intended internal pathways; often prompts rinsing and reset steps | Still depends on using the right product and following the prompts exactly |
| Manual descaling process | Simple filter machines and models without an automatic cycle | Straightforward on basic machines; no need for software prompts | More room for user error; easier to miss soak or rinse stages |
Alternatives
- Use a water filter approved for your machine to reduce scale build-up between descales
- If your local water is very hard, use the hardness setting on machines that support it so descale reminders are more accurate
- Book a service if the machine is severely scaled, blocked or leaking
Pro tips
- Descale when the machine prompts you, not just when performance gets noticeably worse.
- If your water is hard, expect to descale more often than someone using softer water.
- Clean the milk system separately and promptly; descaling does not remove milk residue.
- Keep a note of the date of each descale so you can spot changes in frequency.
- If your machine has a water hardness test or setting, use it according to the manual.
Safety notes
- Unplug the machine before cleaning external parts unless the instructions say the machine must stay powered for a guided descale mode.
- Descaling solutions are cleaning chemicals, so avoid contact with eyes and skin and keep them away from children and pets.
- Take care around steam wands, boilers and hot-water outlets, which may stay hot after use.
- Never mix descaler with bleach or other cleaners.
What this guide does not cover: This guide covers safe general practice for domestic coffee machines and does not replace the instructions for a specific model. It does not cover commercial machines, boiler disassembly, electrical fault diagnosis, or exact product doses and timings, which must come from the manufacturer and descaler label.
Cost considerations
Regular descaling usually costs far less than replacing pumps, heaters or valves damaged by scale. Using the manufacturer-approved product may seem more expensive upfront, but it can reduce the risk of compatibility problems and warranty disputes.
Frequently asked questions
Can I use vinegar to descale a coffee machine?+
Only if the manufacturer explicitly says it is suitable. Many brands advise against vinegar because it can leave odour, affect taste, and in some machines may harm internal parts or seals.
How often should I descale my coffee machine?+
Follow the machine’s prompt or the interval in the manual. The right frequency depends mainly on water hardness, how often you use the machine and whether you use a filter cartridge.
Do I need to descale if I use filtered water?+
Usually yes, though often less often. Filtration can reduce scale but does not always eliminate it completely.
Why is my machine still slow after descaling?+
It may need another approved descale cycle if build-up was heavy, but persistent slow flow can also point to a blocked outlet, scale trapped deeper inside, or a pump issue that needs service.
Is descaling the same as cleaning the coffee machine?+
No. Descaling removes mineral deposits from the water system. General cleaning removes coffee oils, milk residue, grounds and dirt from parts you can access.
Sources & references
Guidance on this page is traced to documented sources. Last checked 24 September 2026.
- Nespresso Support - Descaling · manufacturer
Supports that coffee machines need regular descaling, that guided descale procedures vary by model, and that official instructions should be followed.
- De'Longhi Support · manufacturer
Supports manufacturer-specific maintenance guidance, use of suitable descaling products, water hardness effects, and model-dependent descale programmes.
- Philips Support - Espresso Machine Maintenance · manufacturer
Supports that descaling procedures are model-specific, that many machines have automatic programmes, and that proper rinsing is required afterwards.
The basic maintenance principle is stable, but exact descale steps and approved products vary by brand and model.