Nest No Power To R Wire

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How does the r wire power the nest air conditioner? A professional can navigate the complicated system to avoid damage. It's important to note that, while the r wire powers your hvac unit, nest is powered by the unit while it's running. So, the r wire indirectly powers the nest.

You may be prompted to look at the screen if your nest starts acting up for unknown reasons. If you receive an e73 error message on your nest, it means there's no power to the rc wire. The "no power to rc wire" message is commonly due to incorrect or loose wiring. Before checking the wiring, first, make sure the hvac breaker hasn't tripped. Depending on your system, you may be required to use a common wire or a power accessory like the nest power connector. If your nest thermostat is displaying the e74 no power to rh wire error code, there's a problem with the rh wire connecting the furnace to the thermostat. This problem will result in power loss to the furnace and is often caused by a blown fuse, a faulty transformer, or a flooded float switch. If the letters rc are red, you've lost power to this wire. Here is how to fix the most common cause of this error code.