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Originally Posted by hvac1000

The fuseable link is the round item on the wire between the connection to the limit switch and the wire. It may look like a little resistor to you. If that is open it will not allow the voltage to pass to make the circuit.

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Checked the fuesable link and it is good.

Good news, furnace is finally working. I had a pro look at it, he figured out what had gone wrong in about 5 minutes. The initial problem was fixed by the transformer that I had replaced. The second problem was caused by my friend - really. We had replaced the old tstat, and one of the wires was put on wrong. The wire was tagged correctly, but it was put on wrong. Lesson learned - double check your work. hvac1000 thanks for your time and all the useful information you provided.

Glad you got to the bottom of that one. Stay warm.