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Starting with the water
For a code whose definition varies by model, the water is a sensible place to begin. Municipal supplies differ across the Bay Area. Some East Bay and South Bay neighborhoods deliver water rich in dissolved minerals, and a coffee machine there collects scale faster. E24 may not be about scale at all, but scale is a common background factor worth ruling out. Ruling it out does not make it the cause, only removes one common variable.
What scale does quietly
Mineral crust forms in the heater, along tubing and around valves. Flow slows. The heater works harder for the same cup. Sensors that sit in the water path may read differently once they wear a coat of mineral. None of that is visible from outside, but the cups taste flatter and take longer to brew. The heater warms the water, and a coat of scale on it acts like insulation.
The cartridge question
Some models take a water filter cartridge. An old cartridge, or one fitted wrongly, can restrict flow or release fine particles. If E24 followed a cartridge change, check it first: is it fully seated, was it flushed, is the date right? A loose cartridge is a quick thing to rule out before anything deeper.
- Cartridge fitted or replaced recently
- Maintenance light ignored for weeks
- White flakes in the tank or on the spout
- Slow, hissing flow from the spout
What can be done outside
- Remove the cartridge if the manual allows and run one cup with plain water.
- Rinse the tank and look for sediment.
- Follow the descaling program if it is due, completing it fully.
Test strips from a hardware store can tell you your tap’s hardness. That number is handy for the technician.
Where a technician looks
The checks follow the water from the tank to the cup: inlet screen, pump, heater, outlet. Scale is judged by inspection and by comparing flow with the specification. The control side is measured only after that. This order keeps a flow problem from being mistaken for a board problem.
A note for filtered-water households
Pitcher-filtered water is softer than tap water, yet it can carry fine carbon dust. If you fill the tank from a pitcher, look at the tank floor for black specks and rinse it more often.
When scale is not the answer
If a clean tank, a fresh cartridge and a completed descaling leave E24 unchanged, the cause lies elsewhere in the machine. Opening it up is outside what an owner should attempt. After diagnosis, the estimate is given in writing, and parts are only ordered once you approve them.
Frequently asked questions
Not necessarily. The meaning varies by model, though scale is a reasonable factor to rule out.
Your water supplier publishes hardness, and inexpensive test strips give a rough answer at home.
If it is badly seated or unflushed, it can restrict flow. Fit it again following the manual.
Only when scale is part of the problem. If the code returns, a diagnosis is the next step.
Model compatibility: Bertazzoni reuses codes across series and model years, so E24 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
