The red light of aca coffee machine flashes and doesn't work because of dirt. It's time for descaling. In standby mode, add the liquid medicine into the water tank until the water is 7 minutes full. Press the descaling button for a long time, and then turn on the steam knob, and the coffee machine will automatically descale. When the water in the first water tank is finished, the coffee machine will be cleaned automatically after adding fresh water into the water tank, and the descaling lights will disappear automatically, or the water hardness will not be adjusted. This will also cause the descaling key to blink in a short time.