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Old 09-10-2016, 10:33 AM   #11
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Originally Posted by Iraqvet05 View Post
I pulled lightly on that red wire but found no fuse in the wall cavity. I ran a jumper wire from an adjacent ceiling light to to thermostat and have A/C now but I still need to trace that wire...maybe to the furnace?
Does the furnace turn on when you set it to heat with the thermostat hooked up to the jumper wire? I would imagine the red wire would be supplied by the furnace considering that is a 12volt device. If the furnace not working may need to be reset? - that may fix the problem of no power to the thermostat. Can't say for sure but grasping for straws at this point!

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Old 09-10-2016, 11:31 AM   #12
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If the thermostat connecting wires are solid copper there's probably one that's broken but can't be seen beneath the coating. Strip back more coating and check, use the pin point of some tacks for your DVM leads and double check for continuity on each wire.

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Old 09-10-2016, 01:06 PM   #13
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The wires are stranded. The furnace does not work with the temp power wire feeding the thermostat. I believe the furnace is not getting power which in turn should feed the thermostat. The furnace in this TT is buried under the sofa. I need to remove the sofa and pry off the luan cover to check there.

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