dunno, I work on electric motors and such for a living... If you had an ohm meterk even a volt meter I could probably help you trouble shoot it.... but thats not something that most people have laying around as my digital meter for work cost me like 400 bucks but from what you are saying the buzzing noise coming from the box, I serously doubt that the cord has anything to do with it probably interna;. Was the thermostat plugged into a line with a GFI?
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