The steam button on my Tefal ProExpress Turbo seems to be permanently on - as soon as it heats up it starts steaming and you can not stop it. I can not even see how to get into the iron to look at the Steam button switch.

Simon Bray, December 2006

Thank you The Fixer above did as you suggested and eventually it cleared and is now working better than ever.I eventually put 250ml water and white vinegar 50:50 mix into the steam generator tank and switched on the unit it continued to steam for several minutes when i then removed the portable front resevoir and kept operating the iron steam switch which appeared to clean the switch and rectify the problem.I then replaced the front half full resevoir and drew the remaining water through the unit to help clear the vinegar.When the whole unit had cooled flushed through the base generator tank with clean water.

John Robbo, April 2010

I tried vinegar and water as suggested and on the third attempt it cleared and is working fine now. Thanks for the suggestion!

Trevor Olsen, April 2007

I've had this on a 2930 & found that it was a chunk of limescale stopping the magnetic valve from closing. I removed the valve piston & cleaned out the limescale & restored functionality.
The piston is screwed into the tube that the solenoid is attached to. Remove the solenoid & gently use grippers to unscrew the valve watching out for the spring etc.
Have a good look inside the tube & clean as best you can.
Reassemble carefully & you should only have steam when pressing the iron button.
Another way may be to fill the heater, where flushing plug is, with 50/50 water & vinegar & switch the express on. This mix should disolve the limescale blocking the valve & stop the steam. Might take a while, try the mix in a kettle & see what it does!
Keep this site informed of progress as others will benefit.

The Fixer, January 2007