There is not much money to be made by repairing irons - they are designed and made to be almost impossible to repair - a safety thing to stop users messing around and electrocuting themselves.
The best you can expect is that Aldi give you a replacement iron. Go back to the shop with proof of purchase.
Peccavi
February 2011
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howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix steam irons.