Did you ever find the reason as I have the same problem.
Margaret
May 2009
I have had the same problem on 2 of these machines. The first was still under warranty & was replaced. I have dismantled the nozzle assembly and found that the control plunger, activated by the trigger, had sheared between the O rings so that the broken piece was effectively blocking the outlet. I am in the process of trying to trace a replacement plunger.
Geoff
September 2008
I have the same problem and cannot make it bring the steam out!
E.R.AKTYPIS
March 2008
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix steam cleaners.