Screw on back of iron is loose. standard allen wrench doesn't fit.

Metric

Just get a new one you don't have to do all that.

You have to take part the iron by unscrewing the three bolts on the side handle with a small phillips driver. Then loose the allen screw on one side of the black thermostat wheel to unloosen it. Then take out the two bolt plastic protectors under the handle and unscrew the two allen bolts, carefully separate the top from the botton of the iron, carefully not to pry loose the cables from the top to the hot shoe.
On the back you will see a small white square box, that is the thermostat, which has a button on top, all you need to do is to push it in. This will make the iron heat up unless you have a thermostat failure (Black wheel with temperature indicators), which you will need to order the part and change it.

Sounds like a 'TORX' head.
Does it look like a 'star' inside the screw head? A six-sided star? If so, then it is a TORX head.
Look carefully at it, and determine whether or not there is a small pin sticking out of the center.

The screw you are trying to remove is either a Flat-Head (-), a Philips (+) or a TORX (*).

You can get TORX bits almost anywhere, from the Hardware store, the Auto-parts store, to a Dollar store. You can get them with, or without, the little hole for the pin in the head.

You will probably want to buy a little 'set' that has multiple sizes of bits, and a driver, with an extension for reaching into those deep holes.

If it looks like a allen and and you cant get it ... be aware allen comes in both metric and standard ... you may be looking at a Torx which is a different animal all together.

Take your Iron to the hardware store and match it up to the proper tool for best results.

Thanks for your interest in FixYa.com

I agree.

It is probably a loose screw (if you shake the iron, you may hear it rattle).. The iron is most likely good, just needs a 5 minute repair.

If you want to do it, or find someone to do it:
1. UNPLUG the iron.
2. remove the 4 screws from the back end of the iron.
3. Open the back plastic plate.
4. There will be a wire with a loose screw; tighten it.
5. There may be a broken wire near the screw; if so, remove the eyelet that is on the screw. put the screw back on and wrap the broken wire end onto the screw and tighten.
6. Replace the back plate.
7. Plug back in and use for a few more years.

Hope this helps!

Take your iron to a hardware store and they should be able to guide you to the tool that you will need.

they do take a special tool. However I have used an allen wrench and it will remove them. Take them to a local hardware store or sears and get the same screw thread pitch in stainless steel and with a phillips or slotted head

I got the Torx security bit at Ace hardware for a couple of bucks

Special screw called "Torx tamper proof" call 925 8271011 and order "Rowenta tool" $10.00 plus shipping-this place also sells Rowenta parts