I have Pro melt pot that I bought in 1993 and still works great. So I bought another from a guy I know that hasn’t used it in a few years it was made in 2006. After it’s been on for 2 or 3 minutes it trips the GFCI and is the only thing on the circuit. I run my old one with exhaust fan and air conditioner on the same circuit without a problem. Is there something that may cause these units to do this after sitting for a few years? Any help is appreciated. Thanks
Donnie