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I know I made a mistake, but here's the storey.

When I was hooking up the new thermostat I did it with live wires, and I used metal pliers (metal touching metal). The wires may have also touched each other during the process. The thermostat didn't work (no power when connected to C), so I switched back to the old one and it still doesn't work.

Where do I start?

Thank you!

  • Do you have a voltmeter? Assuming traditional wiring colors, is there voltage between the red wire and the blue C wire? – JPhi1618 Feb 8 '16 at 14:31
  • Check if there's a breaker or other reset in/on the furnace itself. – David Yaw Feb 8 '16 at 22:35
  • The 3 amp fuse needed to be replaced, but the real culprit was the disconnect box. The box fried up and melted the connectors. – DParz Apr 1 '16 at 17:23
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Change 3amp fuse on control board in furnace

We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

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    Hello, and welcome to Stack Exchange. A little more detail would be really helpful (e.g. how do you know it's a 3A fuse?). Thanks. – Daniel Griscom Mar 29 '16 at 11:20

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