Nest is a smart home company that was founded in 2014. The company was founded by Tony Fadell and Matt Rogers. The company has since expanded and it now sells various smart home products such as thermostats, smoke detectors, security systems, cameras and other products.
The Nest Learning Thermostat is one of the most popular products that the company has to offer. This thermostat is known for being able to learn your preferences and it can also save you money by learning your habits. This device can also be used to control other smart home devices such as lights, locks and cameras. However, this device can only be used with Google’s own app or app store on iOS or Android devices. It cannot be used with any other third-party apps or on computers running any operating system other than Google’s own OS.
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On this page, you will find more information about the most common causes and most relevant solutions for the Nest error 'E78'. Do you need help straight away? Visit our support page.
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It has never been easier to solve error "E78".
View list of solutions Contact an expertError information
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Category
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Error codeE78
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ProductNest
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DeveloperGoogle
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First seenSeptember 6, 2021
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VerifiedYes
What causes the E78 error?
The Google documentation indicates that error code 'E78' is caused by the following problem: "Additional wire(s) required W2/AUX detected by itself".
Do you think there is another cause for this error? Let others know in the comments.
How to solve Google Nest error E78
We've created a list of solutions which you can follow if you want to solve this Nest problem yourself. Do you need more help? Visit our support page if you need professional support with Nest right away.
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Verified solution
When you try to use Nest on a different device or when you try to use Nest outside of its official application, then you might encounter error code e78 on your device’s screen. This error can occur because there is an issue with your device or because there is an issue with the Nest app itself. You might also encounter this error if you are trying to use Nest with a thermostat or an air conditioner that was not made by Nest or compatible with it.
In this article, we will be showing you how to fix this error code E78 and how to resolve the issue. We will also be giving you some information about this error and how it can be prevented in the future.
When a device encounters an error, it can do several things. It can do something like shut down or restart itself in order to correct the problem. However, it can also display an error message on its screen or send an error code out of its own to tell other devices that there is a problem with the device itself. This is exactly what happened when your Nest thermostat encountered this error code e78 and told other devices that there was a problem with your device.
The E78 code usually refers to an incorrect wiring with the device's system. In this case, the issue might be with the wiring of your thermostat. This error code can also refer to a problem with the wires or any other part of your device that connects to the thermostat. Since this is hard to fix by yourself unless you’re handy, and the solution might differ on a case-by-case basis, it might be best to call customer support for some pointers on how to fix this.
Have you found a solution yourself, but it is not in the list? Share your solution in the comments below.
