Nest thermostat is not cooling? This is how you fix it

nest thermostat is not cooling

The Nest thermostat is a great way to control your home’s different schedules, depending on you and your needs, for the best possible heating and cooling. Is your Nest thermostat heating instead of cooling? When your Nest doesn’t work as well as it should, your Nest thermostat not cooling can be a big pain. This article will discuss some common Nest thermostat problems and how to fix them.


Nest is a household name in the thermostat market. It is well-known for its artificial intelligence capabilities, which allow it to learn from you and your preferences. While it is a powerful system, sometimes the thermostat fails to cool your home. This can be inconvenient because it can make your home uncomfortable, and even potentially harm your HVAC system.

Fortunately, there are a few simple things you can do to troubleshoot and debug your system. Some options include:

  • Restart the system
  • Check the wires
  • Check the C-wire system
  • Perform maintenance
  • Check for a tripped circuit breaker
  • Replace a blown fuse inside the air handler
  • Check the Nest compatibility with your cooling system
  • Install the Nest power connector
common problems with nest thermostat

Troubleshooting the issue when your Nest not cooling house

If your Nest not turning on ac, it can be inconvenient. Fixing a Nest issue and getting your home cool again is not as complex as it might seem. Just follow these simple steps and you will be able to solve your nest thermostat problem in no time. Fixing these common problems with the Nest thermostat can get you cool in no time.

Restart the system

If your Nest not cooling to set temperature, the first thing you should try to do is restart it. Sometimes, when Nest detects that its system has stopped working properly; it will shut itself down to prevent damage from happening. To fix this common Nest issue all you have to do is unplug the device for a minute and plug it back in. This will restart your nest thermostat and allow it to begin working again. If your Nest thermostat won’t turn on still, you might have to contact a professional.

Another easy way to restart the thermostat is by heading over to settings > reset > restart

nest not turning on heat

Check the wires

If you have a Nest thermostat that’s not cooling, there is a good chance that your system may be wired incorrectly. If you are using an older version of Nest wire wall plugs, they need to fit into one another for them to work properly. You can buy new wire wall plugs from Amazon or at most electronic retailers if yours do not fit together correctly anymore.

You need to check all of your wiring connections carefully before deciding on what steps you should take next because this could cause further damage by simply plugging things in. Make sure everything is plugged in according to Nest’s instructions and make any necessary changes. 

Check the Nest C-wire system

If your Nest thermostat is not cooling, you need to check the Nest C-wire. The C-wire system allows for more power to circulate through your heating and air conditioning systems. This means that you will have an easier time programming your home’s temperature because of this extra boost of energy provided by the wire. 

To check if you have one or not, look at both ends of the wires coming out of the Nest thermostat. If there are three holes on either end instead of just two then you have a Nest C-wire. If you have one, double-check that it’s installed correctly and isn’t frayed or otherwise broken. The wires need to have a solid connection to function correctly. Loose wires should be secured and connected with a wire nut.

nest thermostat no power

Perform any required maintenance

If your Nest thermostat is not working properly, you might need maintenance on both the outside and inside units themselves. You should clean or replace filters as needed because they get dirty after time which could cause issues with air quality throughout your home’s ventilation system. Also, check for any faulty wiring around the exterior base of Nest, especially near areas where water might get in. You should also make sure that your Nest thermostat is the correct size for your system and space.

Check for a tripped circuit breaker

Checking a circuit breaker should be your next step if your Nest still has issues. If your Nest not turning on the heat, check for any tripped circuit breakers in your electrical panel. If your circuit breaker has been tripped it may need a simple rest.

Circuit breakers are used to protect electrical equipment by shutting off power when there’s an overload or surge of energy that might damage whatever is plugged into it. If this happens then your Nest thermostat could end up frying its components. Sometimes they can reset themselves after a few moments but if it won’t turn on again even though everything else seems fine you may need to call a professional.

Blown fuse inside the air handler

If all else fails and your Nest thermostat is still not working, you might have a blown fuse inside the unit itself. You can see if this is what’s going on by taking off the back of the Nest thermostat to check for any visible signs that it has been blown or broken.

If there are no signs of it being blown then turn off your system at its main breaker switch. Check with a flashlight to see if something has fallen in the wall. Also, check where the wires connect into the Nest as well because they could be disconnected or dislodged which would cause problems once again.

nest not cooling to set temperature

Check if Nest has compatibility with your cooling system

If you are still having problems after restarting, checking the wire, and performing proper maintenance then it might be time to check whether or not your Nest is compatible with your air conditioning unit. The easiest way to do this would be by following instructions outlined in the user manual of both products. 

Installing the Nest power connector

You’ll also need to make sure the Nest Power Connector is installed and working correctly. This device will provide Nest with the power to do its job. If you don’t have one of these connectors or if your wires are frayed or broken then installing a new connector is crucial.

If you are experiencing this type of problem, it is most likely caused by a lack of power to the unit itself. To solve this issue, install a new power connector. This will help stabilize the energy flow coming in and out of your new Nest thermostat.

Frequently asked questions (FAQs)

Can I install Nest myself?

While it is possible to do so, we recommend allowing a professional HVAC contractor to help you out. They have the tools and experience needed to get this done for you quickly without any problems. It’s also important that they know how your cooling or heating system works as well. 

How long after installation should Nest show me the temperature in my house?

If the Nest thermostat has not received power within twenty minutes after installation, it will show the last known temperature in your home. If this is not working then you should check to ensure that wiring has been completed and the Nest is receiving power. 

How does Nest help me save money?

Nest thermostats help to reduce energy usage by learning what temperatures you like at certain times of day and through different seasons. This allows the unit to turn up or down the heat when you are not at home. This means that your system is not working to cool or heat a home when it is empty. 

They also provide reports on these findings so you can see how much money or natural resources were saved over time as well. They work with most HVAC systems out there but are best suited for homes with many windows because sometimes sunlight coming through can cause fluctuations in temperature that Nest can handle intelligently.

How does Nest learn what temperatures I like?

The Nest thermostat will learn how you want your home to feel through a series of interactions. When you change the temperature, Nest keeps track of when you manually use its setpoint adjustment button on the unit itself, automatically when Nest uses motion sensors to see if anyone is in range, or via a phone application. It’s best just to let the Nest thermostat take care of everything for you, rather than tweaking it too much. That way all you have to do is enjoy living in your ideal temperature without having any unnecessary work done, all while still keeping your bills low.

nest thermostat not cooling

Final thoughts

Once everything is done and you’ve installed your Nest thermostat, we hope that it will be working to the best of its abilities. If there are any issues then you should try restarting the Nest system, checking the wiring, and ensuring that a proper power connection has been achieved. 

Is the Nest thermostat not cooling still? You might need to check your Nest compatibility with your cooling system or the ventilation and airflow to make sure it’s working properly. If your Nest thermostat has no power then it can’t work correctly. And lastly, if there is ever a tripped circuit breaker or blown fuse inside of your air handler unit then Nest will not be able to function correctly until these are fixed or replaced.