Hi, you need not to disturb yourself too much, just take the iron to any electronic repairer or electrician around you and they will replace the cord for you. They have the screw drivers for all types of screws...
There are two cause. One the boiler resistance doesn´t turn of because of snap disc or bimetal thermostat fault or because a coil in the working valve (security valve). But if you can heard a click of opening movement of valve when you push the button it is able to be a thermostat.
