Rc Wire No Power Nest

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Upon checking the nest unit downstairs, everything was back to working as expected. The safety switch that was being triggered is designed to be a kill switch to the air conditioning unit. When it's engaged, the a/c shuts off and more importantly, your nest unit will report that it's not receiving any power, which it's not. A "no power" alert can be caused by the following:

Your thermostat is connected to a system that requires a c or common wire, but that wire isn't. The nest thermostat has no power to rh wire, or the nest e74 error may be due to several issues, most commonly due to connection errors. 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. 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. If your nest thermostat is frozen or unresponsive, you can manually restart the system by following these steps: