I have a Tefal GV7070 Steam Generator Iron. When switched on the "kettle" heats up and then the "Fill Reservoir" light comes on although the reservoir is full! The iron will not generate steam. When allowed to cool and the screw plug for cleaning is removed and water put directly into the "kettle" and the plug replaced the iron works as normal until the water is used up. It appears that something is not allowing the "kettle" to be filled from the reservoir. Is there a valve or solenoid that allows the reservoir to fill the "kettle" or could something else be causing this failure?