My Duraflame heater was working just fine until I blew a circuit and had to flip a breaker. When everything else came back on tonight I unplugged the heater overnight and then tried to plug it back in.
It probably shorted out. Heaters use a lot of power. I wouldnt use this heater anymore. If you buy a new one, make sure the outlet has enough power to run it for extended periods
I would check the cords for a short in it. Patch it with black electrical tape. Be sure you know what you are doing.