Klarstein coffee maker’s descaling indicator light stays on even after descaling.

Safety first: Unplug before opening the housing; normal reset can be done with power on as per manual.

Reset procedure:

• Consult the Klarstein manual for the specific model; many require holding a specific button (e.g., "CALC" or "DESCALE") for several seconds after descaling to reset the indicator.
• Perform the reset with the machine powered on and idle.

If light remains on:

• Descale again to ensure proper flow through the flow meter.
• If the flow meter is not sending pulses, replace it.

Persistent issues may indicate a control board memory problem, requiring PCB replacement.