Nest Thermostat Not Cooling: Causes and Fixes

next thermostat not cooling fix and troubleshoot

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Do you need help keeping your home cool with your Nest thermostat? You’re not alone. Despite being a popular and widely used smart thermostat, Nest thermostats can sometimes encounter cooling issues that can be frustrating for homeowners.

There can be multiple causes for why your Nest thermostat is not cooling as it should. Several factors can contribute to this issue, from Wi-Fi connectivity problems to faulty wiring.

However, the good news is that there are steps you can take to troubleshoot and fix the problem.

In this article, we’ll take a closer look at the possible causes of the Nest thermostat not cooling and guide you through the steps you can take to “fix Nest thermostat”.

We’ll cover everything you need to know to get your Nest thermostat working efficiently again.

Possible Causes Of Nest Thermostat Not Cooling

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There could be several factors behind the Nest thermostat not cooling properly. In the following sections, we will discuss these possible causes in more detail and provide solutions to fix them.

If none of these steps resolve the issue, try factory resetting the Nest thermostat or turning off the auto schedule feature, as these may fix any software issues.

Finally, if none of these steps work, it may be time to contact a professional HVAC technician to diagnose and fix the issue.

It’s important to remember that while these steps may fix many common issues with your cooling, other underlying issues may require professional attention.

By following these steps and consulting with a professional as needed, you can ensure that your Nest thermostat is functioning properly and keeping your home cool and comfortable.

Checking Wi-Fi Internet Connection

It’s important to check the Wi-Fi internet connection first. If your thermostat isn’t connected to Wi-Fi, it won’t be able to communicate with your cooling system properly, resulting in cooling problems.

To check your Wi-Fi internet connection, go to the settings menu on your Nest thermostat  and look for the Wi-Fi option. If it says “disconnected” or “unable to connect,” there may be an issue with your Wi-Fi network or router.

First, make sure that your Wi-Fi network is working properly and that your router is turned on. If your Wi-Fi network is working, but your Nest thermostat still can’t connect, try moving your router closer to your thermostat or using a Wi-Fi extender to boost the signal.

Additionally, make sure that your Wi-Fi network is not overloaded with too many devices connected to it, which can slow down the internet speed and cause connection issues.

By checking and troubleshooting your Wi-Fi connection, you can fix the issue of your cooling and keep your home at the perfect temperature.

Checking Battery Health

The battery health may be a possible cause. The battery life of the Nest thermostat depends on usage, but it is recommended to check the battery status periodically.

To check the battery’s health, go to the settings menu on the thermostat and select “Technical Info.” From there, select “Power” and check the battery voltage.

If the voltage is below 3.6V, the battery needs to be replaced. You can purchase a replacement battery from Nest or a third-party vendor.

However, it is important to note that the Nest thermostat is designed to be hardwired to a power source so a low battery voltage may indicate a problem with the wiring.

If the battery voltage is normal, then the battery is not the cause of the cooling issue. Checking the battery health regularly can help prevent issues with the Nest thermostat and ensure that it operates smoothly.

Checking The Nest Thermostat Wiring

Problems with the wiring can also cause the Nest thermostat to fail to cool the house as it should. Conduct a thorough inspection of the terminal connections for the wires to check that they are both secure and correctly attached.

You could also take a look at the product manual to make sure that the Nest thermostat wiring is done properly.

Testing Wiring With The Old Thermostat

If the wiring of the thermostat seems to be in order, you may verify its integrity by reinstalling the previous thermostat and observing whether or not the cooling system functions.

In that case, it is highly recommended that you seek the assistance of a qualified H VAC technician, who will be able to identify and address any problems you may be experiencing with your Nest thermostat.

Checking Compatibility With Cooling System

Before you install your Nest device, it’s important to ensure compatibility with your cooling system. If your Nest thermostat is not compatible, it may not work as expected, and you could experience cooling issues.

To check compatibility, first, turn off the power to your HVAC system. Next, remove your old thermostat and examine the wiring. The Nest thermostat is compatible with the vast majority of 24V heating and conditioning systems, including oil, gas, electric, heat pump, heat pump, radiant and forced air systems.

However, it may not be compatible with high-voltage systems or systems using proprietary communication protocols.

To determine compatibility, check the wiring labels and consult the Nest compatibility checker on the Nest website.

The compatibility checker will ask a few questions about your current setup, such as the type of heating and cooling system you have, the number of wires, and the voltage.

If your system is not compatible, Nest provides a list of recommended professionals who can help you with installation.

Checking compatibility is essential to ensure that your Nest thermostat functions correctly and efficiently. It will also save you from troubleshooting issues and prevent you from facing unnecessary costs associated with returning or exchanging the product.

Restarting The Nest Thermostat

Simply restarting the Nest thermostat is a straightforward troubleshooting technique that, if taken, can fix a variety of inconsequential problems.

On the thermostat, you’ll need to press the Nest button and then click “Settings.” Select “Restart,” then wait for the device to complete the restarting process.

After the system has been restarted, check to see if the thermostat is presently setting the temperature appropriately. Make sure to check the Nest power connector before restarting the thermostat.

Checking Circuit Breakers

The Nest thermostat’s inability to maintain an appropriate temperature may be the result of a tripped circuit breaker. Make sure that all of the breakers in the circuit breaker box are set to the “on” position by checking the box. If a circuit breaker has been tripped, it can be reset by turning it off and then back on again.

Checking Air Handler

The air handler is a crucial component in your H VAC system that circulates cold air throughout your home. Check whether the cold air handler is receiving power as the initial measure. If not, verify that the circuit breaker has yet to be triggered.

Next, verify that the air handler filter and the heat pump are spotless and free of debris. A clogged filter can reduce ventilation and lead to issues with blowing cold air throughout the house.

A dysfunctional blower motor or a broken fan belt are two possible causes. If you hear unusual sounds emanating from the air handler or observe a decrease in airflow, it may be due to these issues.

To prevent further system damage, it is essential to have a professional HVAC technician inspect and rectify any problems with the air handler.

In some instances, the air handler may not be the cause of the Nest thermostat’s inability to cool. Nonetheless, it must be inspected to rule out any potential problems with the HVAC system.

Turning Off The Auto Schedule

Turning off the auto schedule is another option if the thermostat is not cooling properly. This feature can sometimes cause issues, as it may not be programmed to cool at the desired times. 

To turn off the auto schedule, go to the Nest thermostat device or the Nest app and then click on “Settings” and “Auto-Schedule.” Finally, choose “Off” to turn off the feature. This should give you more control over the temperature settings and help you to avoid any cooling problems caused by auto-scheduling.

How To Factory Reset Nest Thermostat

nest factory reset

Resetting the Nest thermostat to factory settings is a troubleshooting step that can resolve a variety of problems, including when the thermostat is not functioning or cooling properly.

A factory reset will remove all previous settings and data from the device, so it’s essential to have a record of the existing settings before proceeding.

To factory reset the Nest thermostat, press the Nest ring or open the Nest app, then access the Quick View menu and select Settings. Scroll to the Reset option and select it. Then select Confirm to initiate the factory reset. 

Once complete, the thermostat will restart and display the Nest thermostat screen. Follow the on-screen instructions to set up the thermostat again, and restore the previous settings if desired.

Keep in mind that factory resetting the Nest thermostat should be the last resort, and other troubleshooting steps should be performed first.

How To Force The Nest Thermostat Cool Your House

If you want to force the Nest thermostat to cool, the first step is to switch off the thermostat from the main power supply. Once it is off, check the wiring to ensure it is connected correctly.

If the wiring is correct, switch the power back on, and the thermostat should restart. Go to the thermostat’s settings and select “Cool” from the options. Next, choose the temperature you want to maintain in your home. 

If the Nest thermostat still does not cool, check if the fan is on “Auto” or “On.” If it’s on “On,” switch to “Auto.” This setting only allows the fan to turn on when the cooling system is running.

If the problem persists, try resetting the thermostat to its factory settings or contact Nest customer support through the nest app for further assistance.


What Should I Do If My Nest Thermostat Is Not Compatible With My Cooling System?

This could happen if the wiring in your home is not suitable for the Nest thermostat or if your Nest thermostat does not support the cooling system in your home.

Go to a person that specializes in heat pumps, ventilation, and air conditioning to find out if your Nest thermostat will be compatible with their system. Modifying the system or the thermostat could shield you from potential harm if you have the necessary level of knowledge.

What Are Some Common Causes Of Nest Thermostat Cooling Issues?

One of the most common causes is a problem with the thermostat’s wiring. If the wiring is damaged or not connected properly, it can prevent the cooling system from working correctly. 

Another common issue is an outdated or incompatible cooling system. The Nest thermostat may be unable to communicate with the cooling system, which can cause it to malfunction. 

Low battery power can also cause issues with the thermostat’s cooling functionality. Additionally, dirty or clogged air filters can prevent air from flowing properly, causing cooling issues.

How Do I Know If The Wiring Of My Nest Thermostat Is Causing The Cooling Problem?

Troubleshoot your Nest thermostat’s wiring if you think it’s producing cooling issues. Flip the circuit breaker to switch off your HVAC system. Remove the Nest thermostat from its base and inspect the wiring. Look for loose connections and frayed wires.

If problems arise, gently remove the wire and strip the end before reinserting it into the terminal. Test the wiring with your previous thermostat to discover if the Nest thermostat is the problem. To avoid electrical risks, ask an expert if you need clarification on how to connect the wiring.


In conclusion, if you’re facing cooling issues with your Nest thermostat, there could be various reasons. You may have to check your Wi-Fi connection, battery health, wiring, and compatibility with the cooling system. You can also try restarting your thermostat, checking circuit breakers and air handlers, or factory resetting the Nest thermostat.

If you need more time to be comfortable troubleshooting the issue yourself, it’s best to contact a professional technician. They will be able to help you with any complex issues and ensure that your Nest thermostat is working correctly. Always turn off the power before attempting any electrical work and follow the manufacturer’s guidelines carefully.

It’s crucial to regularly maintain your Nest thermostat and keep it updated to ensure it operates correctly. By doing this, you can avoid unnecessary problems and save energy in the long run. Always check your thermostat for updates to avoid software glitches and problems.

We hope this guide has been helpful in troubleshooting any cooling issues with your Nest thermostat. By following the steps mentioned above, you can ensure that your Nest thermostat is working efficiently and effectively, keeping your home comfortable and cool during the hot summer months.

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