Edwin, according to the Owner's Manual, when this happens the drain hose is not connected properly. Turn the unit OFF and unplug it, then disconnect the hose and reconnect it. Plug the unit back in, Turn the Master ON/OFF Switch to ON and press the pump button. If the hose is connected properly, the pump should tunr on and pump the water out.
To help you further, I have included a link to the Owner's Manual for a Delonghi model like yours. Once you go to that page, click on the Acrobat Reader Icon and download the Owner's Manual. You may print it is you like.
http://www.delonghi.com/us_en/products/dd50p/Hope this helped you. Please let me know. Thanks.
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