I recently plugged a space heater in to my house, and i notice a buzzing noise coming from the floor boards a few feet from the outlet at which it is plugged in. Is there faulty wiring perhaps? Is this a fire risk?
What is the typical cause of this?
Added info: House was built in 1850, but with lots of renovations over the years. No knob and tube.
Thank you very much for any help you may have to offer!