I have a GFI outlet in my bathroom, which is connected to the outlet in the dressing room. I had been instructed to push the button if I ever had a problem. Of course, I had completely forgotten all about this. Soo... one day my iron (in the dressing room) wouldn't heat up and my night light Iin the bathroom) wouldn't light up.
I figured the night light needed a bulb, and figured the iron was bad. I threw out the iron into the dumpster, and bought another one, which wouldn't heat up either. Took the new iron back to Target and spent a half hour waiting for them to find a replacement. Turns out they have no more of that model. Finally, I asked them to test it and it worked fine.
The light dawned ! I came home and pushed the button o n the outlet. So now I am out one perfectly good iron and the money for the new one. The night light works fine now.