No Power To Rc Wire Nest

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If you have an extra like blue, take it and place it on the common terminal of the nest thermostat. Then go to your furnace, find the common wire off the transformer and connect it to the blue wire that will give you power to your nest. Ask your own hvac question. I actually just found another 2 wires inside the wall.

Other important causes may include a defect in the hvac float switch and hvac control unit switch. All these causes are reversible and may easily be removed without support. The no power to rc wire error code means that there's no power running to the rc wire. However, if there is only a wire running to the rh slot on your thermostat and there's a jumper wire connecting the rh and rc slots, your thermostat will only display the e74 no power to rh wire error code. An e73 error means there's no power going to your nest's rc wire. This can affect the function of your air conditioner, the nest's power, or both. The most common reason to receive an e73 message is due to improper or loose wiring. To avoid this issue, it might be best to have a professional install your nest in the first place. A "no power" alert can be caused by the following: