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A steady combined CLEAN/DESCALE indicator on the matching BES870 revision calls for the descaling instructions rather than assuming the flashing-light cleaning cycle will clear it. Confirm the label first: the lamp behavior and the name on your machine both matter.

Model and procedure boundaryFor the BES870 revision with a combined CLEAN/DESCALE indicator. Do not apply this interpretation to every older CLEAN ME panel, Barista Pro display or Express Impress machine.

Which observation matches?

Choose the closest observation. The complete decision list remains below.

Combined CLEAN/DESCALE label, steady light

Review the descaling section for that exact revision and the required approved agent.

The same combined indicator is flashing

Start with the flashing cleaning-light article, not a descaling shortcut.

You completed only the group-head tablet cycle

That does not establish completion of the separate water-path descaling procedure.

The lamp remains steady after a documented full descale

Record the stages completed and final state. Ask support before adding another dose of chemical.

Safe checks, in order

  1. Check the rear/bottom label safely with the machine off, cool and empty enough to handle; do not tilt a hot full brewer.
  2. Confirm whether the last maintenance used a cleaning disc/tablet or a tank descaling solution. Those are different operations.
  3. Follow the exact manual for solution preparation, water-filter handling, outlets and rinse stages. Do not improvise a chemical recipe.
  4. After the full procedure, discard the waste liquid and confirm normal operation before making a drink.
Representative semi-automatic espresso machine; not a photograph of the exact BES model.
Representative semi-automatic espresso machine; not a photograph of the exact BES model. See the manufacturer reference for exact components. Photo credit and license.

What a persistent light does and does not tell you

It tells you the expected maintenance state has not cleared. It does not tell you how much mineral deposit remains, and it cannot be used as a test of chemical residue. Review the completed steps before diagnosing a failed component.

When not to descale immediately

If the machine has no flow, an internal leak or an uncontrolled steam release, do not use a chemical cycle to see what happens. Document the separate symptom and obtain support. A safe, functioning machine with a routine maintenance prompt is a different case.

Stop and obtain help when

Stop for a failed rinse, unknown chemical mixture, blocked flow, leaking or a warning pattern not described by the matching manual.

Questions this diagnosis does not skip

Can I add more descaler to make the light go out?

No. Use only the prescribed concentration. More chemical is not a diagnostic method.

Is this the same as FLUSH on the Barista Pro?

No. Use the Barista Pro procedure for its own display and maintenance system.

References and evidence

Manufacturer facts and procedures are referenced above; the observation comparisons are our diagnostic synthesis, not proof of a failed component. Photos are illustrative, not evidence of hands-on testing. Editorial standards | Report a correction.