Check the position of the opening lever-mine doesn't always return to it's original position,if stuck then physically push it back and then relock and open central locking-this worked for me until today. Cost me £40 for renault garage to open it-I suspect by just squirting Wd40 everywhere-they then wanted £200 to fit a new mechanism. Ebay second-hand £15 so I'm doing it myself.
Geoff, March 2012