Why is my Alicia Moka machine displaying the message ’H2O’?

The H2O message appears on the display when:- There is no water in the boiler. In this case fill the boiler and the indicator will disappear.- The mocha is not correctly assembled on the the base: ensure that the boiler is properly positioned on the base.- The operation has been restarted when the boiler is still too hot. Allow the machine to cool completely and then restart.