Lucy Soboleva Key Takeaways
- The CM24's brew group should be rinsed daily and deep-cleaned weekly with a dedicated cleaning tablet to prevent coffee-oil buildup.
- Descaling every 1–3 months depending on water hardness is the single most important CM24 maintenance task.
- Ignoring the coffee-machine-clean-group alert leads to bitter flavor and eventually damages the brew-group mechanism.
- The water filter cartridge should be replaced every 50 liters or two months, whichever comes first.
- A flow-meter error alert after descaling often means scale fragments have lodged in the flow meter — run two additional water-only rinse cycles before calling a technician.
- Grinder burr wear is gradual and best detected by checking ground consistency annually — replace burrs via a technician when extraction times shift noticeably.
The Bottom Line
Weekly brew-group cleaning and monthly descaling are the two routines that keep the Bertazzoni CM24 producing café-quality coffee and prevent costly service calls.
Why Bertazzoni CM24 Coffee Machine Maintenance Matters
The Bertazzoni CM24 built-in coffee machine integrates a fully automatic espresso system directly into the kitchen cabinetry — a premium addition to any Professional Series or Master Series kitchen suite. Its precision brew group, thermoblock heating system, and integrated grinder all require consistent care to maintain extraction quality and machine longevity. Coffee oils oxidize and coat the brew group after every cycle; dissolved minerals from tap water accumulate on the thermoblock and boiler over weeks of use. Unlike a standalone espresso machine that sits on the counter, the CM24's built-in installation means internal access for technician repairs is more involved and more expensive. This makes preventive owner maintenance even more valuable — the two core routines of brew-group cleaning and descaling take a combined 15 minutes per week and prevent the majority of service calls. Neglecting them leads to bitter, under-extracted coffee, longer heat-up times, and eventually mechanical failures that are entirely avoidable.
Tools You'll Need
All owner maintenance on the CM24 is designed to be performed without tools. The machine's menu system guides you through each routine in sequence.
- Bertazzoni-approved descaling solution (citric-acid-based) — do not substitute vinegar, which can leave residues in the boiler that affect flavor.
- Bertazzoni CM24 cleaning tablets for brew-group deep cleaning — use manufacturer-specified tablets, as third-party tablets may not dissolve fully at the CM24's water temperature.
- Microfiber cloth for exterior panel and drip tray cleaning.
- Soft-bristle detail brush for cleaning around the steam wand tip and group head seal.
- Replacement water filter cartridges compatible with the CM24 — keep at least two spares on hand to avoid running the machine beyond the filter change threshold.
Weekly Tasks
Weekly tasks take under 10 minutes and are the most important frequency for maintaining extraction quality on the CM24.
- After the last coffee of the day, run a brew-group rinse cycle via the maintenance menu. This flushes residual coffee oils and grounds from the group head before they oxidize overnight.
- Run the brew-group deep-clean cycle using a manufacturer-supplied cleaning tablet once per week if the machine produces three or more drinks per day, or every two weeks for lighter use. The coffee-machine-clean-group alert will appear when the machine determines this is overdue — do not dismiss it without completing the cycle.
- Empty and wipe the drip tray and grounds container. Check the drip-tray level sensor for coffee grounds that could block the float.
- Wipe the exterior panel and steam wand with a damp microfiber cloth. For the steam wand tip, purge steam for three seconds immediately after every milk-frothing session to prevent milk from drying inside the nozzle.
Monthly Tasks
These tasks should be completed monthly, or more frequently in households with hard water (above 150 ppm) or heavy daily use of five or more drinks per day.
- Run a full descaling cycle using a Bertazzoni-approved descaling solution. Initiate via the maintenance menu on the control panel. Do not interrupt the cycle once started — a partial descale can leave acid residue in the boiler that affects both taste and component longevity. If the coffee-machine-flow-meter-error appears after descaling, run two full water-only rinse cycles before investigating further — scale fragments sometimes dislodge during descaling and temporarily obstruct the flow meter.
- Remove and rinse the drip tray and grounds container completely. Inspect the drip tray float sensor for coffee-oil coating that can cause a false full-tray reading.
- Inspect the water tank for algae growth or mineral film. Clean with a diluted white-vinegar rinse, then flush with two full tanks of clean water before reinstalling.
- Replace the water filter cartridge if it has reached its 50-liter or two-month threshold. A depleted filter allows higher mineral loads to reach the boiler, accelerating scale formation and increasing descaling frequency.
Annual Service Checklist
Once a year, perform a more detailed inspection of the components that degrade gradually and are not visible in routine daily use.
- Inspect the steam wand (if equipped) for milk residue blockages beyond the tip. Soak the wand tip in warm water for 15 minutes and use a soft detail brush to clear the steam holes completely.
- Check all external seals and the brew-group portafilter ring for cracking or deformation. Worn seals cause pressure loss during extraction and produce under-extracted, watery coffee.
- Verify the grinder burrs produce consistent-sized grounds by examining a small sample on a white surface. If grounds are unevenly sized — a mix of powder and coarse fragments — the burrs have worn and require replacement. On the CM24's integrated grinder, burr replacement is a technician task.
- Review the machine's descaling history and adjust frequency if necessary. If you are descaling every six weeks rather than every three months, switching to a CM24-compatible inline water filter or a whole-house softener will reduce mineral load significantly.
Owner Checks vs Technician Checks
Descaling, brew-group cleaning, drip-tray maintenance, water filter changes, and steam-wand cleaning are all designed for the owner to perform without tools. Grinder burr replacement, brew-group mechanism service, pump repair, and thermoblock replacement require a Bertazzoni-authorized technician. The CM24's built-in diagnostic system will flag maintenance alerts in sequence — following these prompts is the simplest and most reliable maintenance guide available. Never attempt to access internal components by removing the built-in housing; doing so in a cabinetry-integrated installation can void the warranty and create electrical hazards.
Signs Your Bertazzoni CM24 Needs Service Soon
- Coffee tastes persistently bitter or sour after a completed descaling and brew-group cleaning cycle — suggests a worn brew-group seal or grinder burr issue.
- Brew time for a double espresso is noticeably longer (over 35 seconds) or shorter (under 20 seconds) than the normal 25–30 second window.
- Coffee-machine-clean-group alert reappears immediately after a completed cleaning cycle — indicates incomplete cleaning or a sensor fault requiring professional inspection.
- The machine fails to reach brewing temperature within the normal warm-up window after powering on — thermoblock degradation or a heating-element issue.
- Unusual grinding noise or clearly inconsistent grinder output (large variation in grind size) suggests worn burrs requiring professional replacement.
- Coffee-machine-flow-meter-error that persists after two full rinse cycles — the flow meter may need professional cleaning or replacement.