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Had the same thing happen to my 2014 3155RL . What it was , when they stripped the insulation to make a splice for the thremostat wire in the basement . They stripped about an 1 1/2" and when they cripped the wire nut , it lefted about 1" of bare wire that would short out on a metal stud. The reason I found was it was getting dark out and I saw a spark when I moved the themostat wire in back of the furnace..
Hope this helps you out.
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