How to Fix “Nest Thermostat No Power to RC wire Detected” Issue?

The first ever thermostat to get the Energy Star certification, the Nest thermostat is one of the best smart thermostats. Released in 2011 by Google Nest, it is famous for its unique capabilities. The self-programming of the thermostat makes it stand out against other thermostats in the market. While Nest is a much-favored option, there has been an issue, namely the one with Nest thermostat no power to RC wire detected. This article is going to deal with the issue and its fixes in detail.

What Is The Issue With No Power To RC wire Detected In Nest Thermostat?

Synonymous to the E73 error, the problem with Nest no power to RC wire is an issue tougher to deal with than other errors in the system of the thermostat. As the name suggests, the RC wire responsible for both heating and cooling systems in the thermostat is not able to receive power and thus hampers the functioning of the device.

What Is The Cause Of The Issue?

The main reason behind no power to the RC wire Nest can be the clogged drain line of the air conditioner, which causes the float switch to activate. Another generic reason for such an error may be a simple problem with the wire settings. 

While this problem may sound too complex to fix on an individual level, it is not the case in reality. Hence, now that we are thorough with the problem and the various causes behind it, let us now move on to the solutions.

How to Fix This Issue Easily?

There are various troubleshooting methods that you can try out whenever you face the issue of no power to RC wire detected e23. Some of them are as follows:

1. Check the Wiring of the Thermostat

Improper connection of wires can cause the thermostat to malfunction considerably. To check the status of the wires, disconnect the HVAC system. Take out the thermostat’s display and check the wires underneath. 

Disconnect the RC wire only and switch the thermostat to heat-only mode. Look into it so that the wire is not corroded or damaged. Use a voltmeter to ensure that it is currently running across the wire. Once you have made sure the wire is alright, put everything back in its place and try running the thermostat now. You may also perform a check on the rest of the wires.

2. Check the Air Filter

A clogged air filter can pose a problem for your thermostat by affecting the airflow through the coils. Locate the air filter and take it out. If it is dirty, clean it thoroughly or even replace it. If it has frozen up, wait for it to defrost. It is recommended to look into the status of the air filters regularly.

3. Check the Drain Tube and Drip Pans of Your HVAC

The drip pan is supposed to dispose of condensed water. If it is clogged, the water backs up to the HVAC system which will result in the Nest thermostat not getting power in this case. Shut down your HVAC system and locate the cooling coils. 

Ensure that there is no clogging or overflowing of water in the drip pans under the coils. If you do find water here, clean out the tubes, pans, and everything to avoid further damage.

4. Check HVAC Fuse

To check the status of your HVAC fuse, turn off your HVAC system and find the fuse. Examine the state of the fuse, whether burnt, discolored, or intact. If the fuse is damaged, replace it immediately.

5. Contact Nest Support

If none of the above-mentioned solutions are working for you, try to contact Nest Support to get more precise solutions regarding your Nest thermostat. The customer service will either guide you to fix it yourself or send a professional.

Frequently Asked Questions

1. What does no power to RC wire mean on the Nest thermostat?

A. This may mean improper connections, clogged water, or a burnt fuse.

2. What is the RC wire on a Nest Thermostat?

A. RC wire is the power wire for both the cooling and heating systems.

3. Why would my Nest thermostat not be getting power?

A. This may mean improper connections, clogged water, or a burnt fuse.

4. Does Nest need an RC wire?

A. Yes, Nest needs an RC wire.


The Nest Thermostat is not only highly adaptive but also saves you a lot of energy while always working towards the lowest energy consumption. With time, Nest learns the appropriate temperature settings to exert at certain parts of the day in different rooms of the house. 

Hence, when the problem of Nest thermostat no power to RC wire detected arises – it is essential to fix it immediately. You can either fix it on your own by using the troubleshooting methods mentioned above or call a professional for help.

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