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Looking to install an ecobee thermostat and decided to measure my common wire before unhooking anything. I tested the R, C wires and see they are only reading 14v, whereas R,Y, and R,W are reading 28v.

I traced the wires from the HVAC board and do see a blue and red wire coming from the C terminal. I then traced the red wire and it looks to be going to the condensing unit, the blue wire does lead towards the thermostat, however, each end is coiled around itself at the splice.

Would it be okay to splice the two blue wires together to make connectivity? Or, is there a specific reason that it would be configured this way.

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Go for it

Any modern furnace will have enough capacity on the C wire to support a "smart" thermostat as well as powering the control board and the compressor contactor, so I would simply take the coiled-up blue wire ends at the splice, nut them together, install your new thermostat, and enjoy!

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  • Thanks, will give it a shot! – Eric Dec 21 '19 at 19:18
  • @Eric -- we thank people around here by upvoting and/or accepting their answers :) – ThreePhaseEel Dec 21 '19 at 19:23
  • I just joined, my upvote isn’t reflected for public view :) – Eric Dec 21 '19 at 19:43

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