On most Krups automatic espresso and bean-to-cup machines (such as the EA and Evidence series), .
for at least 10–20 minutes to allow the internal capacitors to discharge. Plug it back in krups error code 09
If the machine allows you to enter the maintenance menu despite the error, a descaling cycle is the best way to clear the internal plumbing. On most Krups automatic espresso and bean-to-cup machines
The wires connecting the temperature sensor to the main electronic board may have vibrated loose during normal operation. The wires connecting the temperature sensor to the
With the machine plugged in but off, press and hold the power button for 10 seconds. Some models reset this way.
A fault in the PCB itself, or a loose connection between the motherboard and the pump/sensor array.
If your machine can stay on for a few moments before the error code triggers, a heavy descaling cycle might save it. Mineral scale restricts water flow and slows down heat transfer.