Rc Wire Nest No Power

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How to fix a nest thermostat's rc power issue. Check the rc wire status. Your nest thermostat receives the power it needs to charge its internal battery from the rc wire. To determine the status of this wire and if it has power or not, press on the dial and then rotate it until you select the small gear icon, and press the dial once more.

Push the nest thermostat ring down and hold it for about 10 seconds, or until the screen turns off, then release. Press and release the ring one time to turn it back on. 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. 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.