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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 'E255'. Do you need help straight away? Visit our support page.
The Google documentation indicates that error code 'E255' is caused by the following problem: "No heating or cooling detected W1 or Y1 wire is required".
Do you think there is another cause for this error? Let others know in the comments.
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.
One of the most common errors that you might encounter when you try to use Google's services is Google E255 error. This error occurs when you try to access your account information or when you try to log into your account on the internet. This error can be annoying and frustrating because you cannot access the services properly.
The problem can be caused by an issue with your device system. If the system is in trouble then it is possible to stop sending power to the thermostat. Another possible reason is that you live at a very high or low temperature place so this code appears. To fix this error, you need to try a few solutions.
The Google E255 error usually pops up a message “No heating or cooling detected. W1 or Y1 wire is required.” on the thermostat screen. This error caused by the thermostat’s wire and the system power are in trouble.
The first thing you can do is to check the system power and make sure it is on. You need to check the switch and click it between hot and cold. Then, you need to check your thermostat and check if it’s working or not.
The next solution is you need to check themorstat’s wire. You need to protect yourself before doing this step. First, you need to turn off the thermostat power. Take off the thermostat screen. Then, you need to check if the wires are inserted correctly in the thermostat. The wires should be connected to the connector.
Another solution is to open the Home app > Select your thermostat > Settings > Remove device Remove. Then, you need to switch to Settings > Factory reset > Reset > Yes. You need to add the thermostat on your Home app again.
Lastly, you can find HVAC professionals in your area and directly tell him or her your device’s problems. They can also help you to install the nest power connector or C Wire to your device. If the error still appears, you can contact Google Help Center to fix your issue.