Well Joyce - if it trips the electric then it's unusable - and it's very probably irreparable too - they tend these days to make irons impossible to repair - to keep amateurs safe.
Is there any warranty on it? - these things don't come cheap - The consumer magazine - Which - recommends (used to recommend) the Philips Azure steam iron - Amazon £33 - you could buy 5 of them for the same price as the Tefal.
Good luck...
May 2015
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