I had a regular 15amp duplex outlet in my kid’s room. Because it is on the third floor, the heat doesn’t work that great and we had a small ceramic heater plugged in. She called me into her room. She unplugged the heater because there were “scorch” marks around the top part of the duplex.
Went to the hardware store and bought a new outlet. (15 amp duplex outlet with also two USB ports) Hooked it up and then tested it. The bottom half of the duplex tests “correct”, when I plug it into the top part it says open ground.
It is not controlled by a switch and I didn’t break any tabs.
What could make this happen? Is it safe to use the outlet or just the bottom of the duplex? I tested all the other outlets on that breaker and they are all fine. I also double checked my connection and the plastic box connections. Do outlets with USB ports show open grounds?
While it would be a mystery that would be good to be solved, would putting a GFI outlet in that box assure it is grounded?
Before I call someone I want to see if there is something I may be missing. Any help would be greatly appreciated.