15 Fixes: Nest Thermostat Not Cooling

Nest dominates the thermostat market. It is known for having artificial intelligence characteristics that allow it to pick up on your preferences. Although it is a reliable device, the thermostat will sometimes fail when heating or cooling, causing the “Nest thermostat not cooling”problem. This can cause discomfort in your home and possibly endanger your HVAC system, which can be annoying.

The Nest thermostat is a great way to manage the temperature curves in your home for the best possible heating and cooling. Your Nest thermostat that isn’t cooling can be very annoying if it doesn’t work properly. This post will address the “nest thermostat not cooling” problem along with solutions.

Why is Nest not cooling to the set temperature?

Due to not knowing your home’s cooling system, your Nest thermostat is not cooling. This causes your wires to be mislabeled and lost. Your air conditioner’s fuse may have blown and the circuit breaker is off.

It may also be due to outdated software or incorrect temperature conditions. A power outage may be to blame for your thermostat not cooling. Your Nest product may not be ready for AC integration. Regular use may cause a technical malfunction of the Nest thermostat; restart it before use.

Causes of Nest thermostat cooling problems

There is a good chance that the cooling function will not work properly if your wires are not installed properly.
There is a good chance that your air conditioner will not reach the set cooling setting if the wiring is not connected to the Y1 terminal.
There is a chance that Nest will not work on the system you are trying to install it on.
Sometimes you need to restart your device to get it working again.
Your cooling configuration assigned by Nest may have problems with an active C-Wire connection.
Sometimes there may be a hardware problem that requires a complete disassembly of the thermostat in order to fix it.

Troubleshooting to fix Nest thermostat not cooling to set temperature

Reset the schedule on the Nest thermostat
Restart the ventilation and air conditioning system
Check the wiring in the Nest thermostat
Check and repair your air conditioner
Check the C-wire system of your Nest thermostat
Perform any necessary maintenance
Check if the circuit breaker has tripped
Check for a blown fuse
Check Nest Cooling System Compatibility
Installing the Nest Power Connector
Check your drain pan and AC lines
Replace battery
Remove the power saving unit.
Make sure your Nest software is up to date
Resetting the Nest thermostat to factory settings

1. Reset the schedule on the Nest thermostat

A fantastic technological achievement is the Nest thermostat. It can determine what temperature you feel comfortable at and make sure it stays within that range.

The Nest thermostat made a mistake in scheduling your nighttime temperature or had a bug. The easiest solution you can do is to reset the schedule.

Go to thermostat settings.

Click “Reset”, then select “Schedule”.
For other Nest models, select Reset or Clear.

Now that summer has arrived, your nest is ready for a new routine.
Check to see if the “Nest Thermostat Not Cooling”issue is resolved.

2. Restart the ventilation and air conditioning system.

You might think that with modern technology everything will always work. Sometimes we have to use the “turn off and on again”method, even with the latest thermostats and air conditioners.

Find the switch box, then turn off the HVAC electricity.
The thermostat must also undergo the same treatment.
Turn it off for a while. Your air conditioner may still be on, so make sure it’s off by checking the indicators.
Turn off the generator if you have one. The thermostat should be powered on again after 5-10 minutes.
Check to see if the “Nest Thermostat Not Cooling”issue is resolved.

3. Check the wiring in the Nest thermostat.

Incorrect thermostat wiring can often lead to problems. You didn’t know about the wiring problem because it was running all winter. However, faulty wiring is often to blame if the air conditioner does not work with the thermostat.

Wires can short out and stop functioning properly.
Problems do not often immediately arise due to poor wiring. It may work for a while, but eventually the wire starts to loosen and falls out.
Wire C that won’t fit is one of the most common wiring problems. This common wire powers the Nest.
While not always necessary, it can lead to problems similar to those you experience with your thermostat.
Turn off the HVAC power and Nest in the breaker box. Remove the socket from the wall and carefully inspect the cables.
Completely remove the wire and reinsert it into the terminal if you see a loose wire. Terminal C deserves special attention.
Check to see if the “Nest Thermostat Not Cooling”issue is resolved.

4. Check and repair the air conditioner

The air conditioner is to blame if your thermostat isn’t cooling your home. Most people don’t know how often an air conditioner needs to be serviced to keep it working properly.

Every month he needs new air filters, and the fan and fins should not be covered with dust.
Your air conditioner must also have sufficient coolant to operate.
Even during the day, you can see all these air conditioning problems.
Clean every part of your air conditioner and determine if coolant needs topping up.
Check to see if the “Nest Thermostat Not Cooling”issue is resolved.

5. Check the C-wire system of your Nest thermostat.

The Nest thermostat housing contains several cables. Each wire must be correctly inserted into its terminal for the thermostat to work properly. These wires can loosen over time.

The wires may have been installed incorrectly if the thermostat has not turned on the A/C since installation. The RC (Red Cooling) wire is the most important wire that must be fail-safe for AC activation. This wire may have been damaged, burned, or connected to the wrong terminal.

You should remove the thermostat from the wall to inspect the wiring, terminals and connections, especially the RC wire.
Make sure the cables are properly inserted and not damaged.
The RC terminal must be connected to enable the cooling function of your HVAC system.
The system’s R wire must be connected to the thermostat’s R terminal if it has only one terminal marked “R”and neither RC nor RH terminals.

The 24V hot terminal is the R terminal.
The 24V transformer is where the power is generated and it travels to the thermostat before reaching other devices.

There are other terminals on the Nest thermostat that you should check besides the R, RC and RH terminals.
The G terminal is one of the additional terminals that often causes problems with your AC. It controls the thermostat, the Y terminal which controls the cooling relay in the air conditioner condenser, and the indoor unit fan relay.
Check each thermostat terminal when inspecting wiring and connections.

6. Perform any necessary maintenance

If your Nest thermostat is not working properly, the external and internal components may require service. Filters should be cleaned or changed as needed.

As filters wear out over time, the ventilation system in your home may experience air quality issues.
Around the outer base of the Nest, especially near any potential water intrusion points, look for damaged wiring.
Also, make sure the size of your Nest thermostat is appropriate for your conditions and location.
Check to see if the “Nest Thermostat Not Cooling”issue is resolved.

7. Check if the circuit breaker has tripped.

Check the electrical board for tripped circuit breakers if the Nest does not turn on the heat. Perhaps your circuit breaker just needs a rest if it has been tripped.

By turning off the power, circuit breakers are used to protect electrical devices.
Excess power or surge can damage anything connected to it.
In this case, the components of the Nest thermostat may catch fire.
Sometimes they can turn on again after a short period, but if they do not turn on again.
Turn off the HVAC power and Nest in the breaker box. Remove the socket from the wall and carefully inspect the cables.
Completely remove the wire and reinsert it into the terminal if you see a loose wire. Terminal C deserves special attention.
Find and install a common wire if it is missing.
Check to see if the “Nest Thermostat Not Cooling”issue is resolved.

8. Check for a blown fuse.

If your Nest thermostat is still not working, the fuse inside the unit itself may have blown. By removing the back of the Nest thermostat, you can check if this is the case. Look for obvious signs that it has been blown up or broken.

Shut down the system using the main switch if there is no sign that it has burned out.
If you have a flashlight, check the wall to see if anything has fallen inside.
Also, check where the wires enter the socket, as they may become disconnected or dislodged, leading to new problems.
Turn on the air conditioner after the mixture has settled for 20 minutes.
Wait 10-20 minutes before turning on the air conditioner if the drain pan is still full.

9. Check Nest Cooling System Compatibility

After restarting, checking the wire and performing the necessary maintenance, the problems persist. It may be time to determine if your Nest and your air conditioner are compatible.

The easiest approach is to follow the directions given in the user manuals of both devices.
Follow all instructions in the manual to determine if an improvement has been made.
You can also go to the Compatibility Checker to check your device’s compatibility.

10. Installing the Nest power connector

Make sure the Nest power connector is set up and working properly. This thing will give Nest the electricity it needs to run. Installing a new connector is necessary if you don’t have one of these connectors or if your wires are frayed or broken.

The device is probably the root of the problem if you have this issue.
Plug in the new power connector. This will help regulate the flow of energy to and from your new Nest thermostat.
Check to see if the “Nest Thermostat Not Cooling”issue is resolved.

11. Check drain pan and AC lines.

Over time, due to condensation, the drain pan of the air conditioner will fill with water. You will need to clean out the drain lines as they can become clogged with leaves and dirt.

Your air conditioner will not work properly if the drain pan and drain lines are overfilled and clogged. As temperatures drop at night and trapped water expands or freezes, the problem can get worse.

You might think that the Nest thermostat is to blame for the problem, because the fan will still work.

Remove the drainpipe cover.
Use a fine wire brush to clean the downpipe.
Pour in a solution of equal parts water and bleach. You can also use vinegar instead of bleach.
Turn on the air conditioner after the mixture has settled for 15 minutes.
Wait 15 minutes before turning on the air conditioner if the drain pan is still full.
Check to see if the “Nest Thermostat Not Cooling”issue is resolved.

12. Replace battery

The Nest thermostat may not turn on the air conditioner if the battery is low. For a battery to work perfectly, it must provide approximately 3.6 volts. The battery in the thermostat can degrade over time as it gradually comes to the end of its life.

Its output voltage is not enough to drive your AC. You need to charge the battery or buy a new one to fix it.
Other common battery problems can be as follows.
The thermostat was inadvertently set to “heat”.
The wall-mounted thermostat does not come into contact with the battery.
Acid leaking into the thermostat.
The battery has been installed incorrectly.
Wrong batteries were used.
After replacing the batteries, the thermostat did not reset.
Check to see if the “Nest Thermostat Not Cooling”issue is resolved.

13. Remove the energy saving block.

Utility companies install energy-saving units in HVAC systems to limit electricity consumption. This can be a problem if your air conditioner works fine during the day but not at night.

At night, people use energy-intensive gadgets, as it is cheaper to buy electricity at this time.
If the energy saving device detects a significant power draw, it will stop supplying power to your HVAC system.
The box is located next to the AC or switch box. It usually contains several blinking red and green LEDs.
Find a specialist who can securely remove the box if you have one.
You can do this by contacting the company that installed your HVAC system.
Check to see if the “Nest Thermostat Not Cooling”issue is resolved.

14. Make sure your Nest software is up to date

This is the least likely explanation for why the Nest thermostat stopped cooling or stopped working. Software updates are critical. Many consumers notice the sudden loss of WiFi connection with the device.

The reason is outdated software. Therefore, go to the application and select the update tab. Check if an update is available. Check to see if the “Nest Thermostat Not Cooling”issue is resolved.

15. Resetting the Nest thermostat to factory settings

You should perform a factory reset if the Nest thermostat is not cooling after ruling out all other possible causes. Perhaps a full update will solve the problem in less than a minute. So, to restore factory settings, follow the instructions below.

Launch the NEST app on your smartphone.
Located at the top left of the home screen.
If your home is connected to multiple homes, select the one that contains the thermostat you want to delete.

On the app screen, tap the thermostat you want to delete.
Now go to “Settings”which is in the top right corner.
Scroll down and down.

You see a red “All settings”option.
After you click to confirm, the thermostat will be removed from your Nest account.
Check to see if the “Nest Thermostat Not Cooling”issue is resolved.

Conclusion

There are several reasons why the appliance may not be cooling, or worse, it may be blowing hot air instead of cold air. Because you mislabeled your wiring and used the “Heat Pump”side of your old thermostat instead of the “Regular”side, your Nest thermostat isn’t cooling. To resolve the “nest thermostat not cooling”problem with the nest thermostat, use all of the remedies listed above.

FAQ

Why won’t my Nest thermostat reach the set temperature?

A support band, a headband, temperature difference or fluctuations are common names for this delay. The delay, which often only lasts a few minutes, protects your system from excessive wear and saves energy: The delay is often used in heating and cooling systems to reduce unnecessary wear.

Why is my nest not cooling my house?

You can mislabel your wiring and use the “Heat Pump”side of your old thermostat instead of the “Regular”side; Your Nest thermostat is not cooling. To fix this, reconnect the Nest with new wire tags from your old thermostat configuration using the heat pump side.

Why does my Nest thermostat take so long to cool down?

The thermostat is not getting enough power or has a dead battery, which is the most likely reason for your Nest thermostat not turning on the air conditioner. Faulty connections or loose cables can also cause the problem. Then your Wi-Fi router might also be in trouble.

Why doesn’t my nest turn on my air conditioner?

When your Nest thermostat displays “In 2+ hours”, it means your home is taking longer than usual to cool down. This usually happens when you are trying to raise the current room temperature to something that is comfortable for your home, but at a certain level.