I have a radiant space heater(120v - 1500watts). I plugged it into a new medium duty extension cord(125v - 1625 watts) and now my heater will not work at all. It worked briefly when first plugged in but now there is no power going to the heater at all even if it is plugged directly into the wall socket. Is it possible that I somehow "blew" the cord out when using the extension cord? If so, Can I just have the cord replace?