How can I fix my cuppachino/esspresso maker model 3323?

My coffee maker doesn't want to run water through, eventhough the sieve is clean and the steam is coming out to make froth? When we put the cleaning stuff for iron & kettle through, it runs out black with a lot of scale, but very slowly, not even 10 drops on a cup, can some one maybe help me please?

L. Rothmann
April 2010