how to fix my Russell Hobbs steam gulide 2200 iron?

We've just had our second one of these fail after a day or two. It starts off fine, then just won't heat up or generate steam. The base unit lights are on, so the power's there, but the iron itself won't work. Can't see any reason, so it's back to Argos tomorrow to swap for something more reliable. Hopefully.
Sorry can't be more helpful re a repair!

Malcolm Jones
April 2007