Which iron? There are thousands of different makes and models.
Having said that, you're unlikely to be able to open it as irons are notoriously unrepairable. It MIGHT be a damaged mains cable, probably where the cable enters the iron or the plug.
BE SURE YOU ARE COMPETENT TO REPAIR THIS SAFELY
Ffhi
May 2022
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howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix steam irons.