15 Fixes: Nest Thermostat Not Cooling

Nest dominates the market for thermostats. It’s renowned for having artificial intelligence characteristics that let it pick up on your preferences. Despite being a strong device, the thermostat occasionally fails in heating or cooling, causing the “Nest Thermostat Not Cooling” Issue. This can cause discomfort in your home and possibly endanger your HVAC system, which can be annoying.

The Nest thermostat is a terrific method to manage the temperature schedules in your home for the finest heating and cooling. Your Nest thermostat not cooling might be a major annoyance when it doesn’t function as it should. The “nest thermostat not cooling” issue will be covered in this post, along with solutions.

Why is Nest Not Cooling To Set Temperature?

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

It can also be the result of outdated software or incorrect temperature regimes. Perhaps a power outage is to blame for your thermostat’s failure to cool. Maybe your Nest product isn’t AC integration ready. Regular use may cause the Nest thermostat to develop a technical issue; restart it before using.

Causes Of Nest Thermostat Cooling Issue

• There is a good chance that the cooling functionality won’t function properly if your wires aren’t installed properly.
• There is a good chance that your A/C won’t achieve the predetermined cooling setting if the wiring isn’t attached to the Y1 terminal.
• There’s a potential that Nest won’t work with the system you’re trying to install it on.
• Restarting the device is sometimes necessary to get it working again.
• Your Nest-appointed cooling configuration may experience problems with an active C-Wire connection.
• There could occasionally be a hardware issue that the thermostat needs to be completely disassembled to be fixed.

Troubleshoot To Fix Nest Thermostat Not Cooling To Set Temperature

1. Reset The Schedule On Your Nest Thermostat
2. Restart The HVAC System
3. Check The Wiring In Your Nest Thermostat
4. Check And Repair Your AC
5. Check Your Nest Thermostat C-wire system
6. Perform any required maintenance
7. Check for a tripped circuit breaker
8. Check For Blown fuse
9. Check if Nest has compatibility With the cooling system
10. Installing the Nest power connector
11. Check Your Ac Drain Pan And Lines
12. Replace The Battery
13. Remove The Electricity-Saving Box.
14. Ensure Nest Software Updated
15. Factory Reset The Nest Thermostat

1. Reset The Schedule On Your Nest Thermostat

A fantastic technological advancement is the Nest thermostat. It can determine what temperatures make you feel comfortable and ensure it stays within that range.

The Nest thermostat made a mistake while scheduling your nightly temperature or that it had a bug. The easiest solution you may do is to reset the timetable.

• Go to the Settings of the thermostat.

• Click Reset, then choose Schedule.
• For other Nest models, select Reset or Clear.

• Now that it’s summer, your Nest is prepared to set up a new routine.
• Check if the “Nest Thermostat Not Cooling”  issue is fixed or not.

2. Restart The HVAC System

You’d think that everything would always function with today’s technology. We occasionally have to use the “turn it off and back on” method, even with the newest thermostats and air conditioners.

• Find your breaker box, then shut off the HVAC electricity.
• The thermostat should receive the same treatment.
• Turn it off for a little while. Your AC may still be still on, so make sure it is off by checking the lights.
• Turn off your generator if you have one. The power to the thermostat should be turned back on after 5–10 minutes.
• Check if the “Nest Thermostat Not Cooling”  issue is fixed or not.

3. Check The Wiring In Your Nest Thermostat

The thermostat’s incorrect wiring can frequently lead to problems. You were unaware of a wiring problem because it was operational all winter. However, faulty wiring is frequently to blame if the AC won’t operate with the thermostat.

• Wires may become shorted and cease to function properly.
• Problems aren’t often immediately caused by bad wiring. It might function for a while, but eventually, the wire starts to loosen and falls out.
• The C wire not being placed is one of the most frequent wiring problems. This common wire powers the Nest.
• Although it’s not always necessary, it could lead to problems similar to the one you’re experiencing with your thermostat.
• Turn off the power to the HVAC and the Nest in the breaker box. Take the Nest down from the wall and look at the cables closely.
• Remove the wire entirely and re-insert it into the terminal if you see a loose wire. The C terminal deserves special attention.
• Check if the “Nest Thermostat Not Cooling”  issue is fixed or not.

4. Check And Repair Your AC

The AC is to blame if your thermostat isn’t successfully cooling your house. Most people are unaware o how frequently an AC must be maintained to work properly.

• Every month it needs new air filters, and the fan and fins shouldn’t be covered with dust.
• Your AC must also have adequate coolant to function.
• Even during the day, you can see all of these AC problems.
• Clean every part of your air conditioner, and determine if the coolant needs to be refilled.
• Check if the “Nest Thermostat Not Cooling”  issue is fixed or not.

5. Check Your Nest Thermostat C-wire system

The body of the Nest thermostat contains several cables. Each wire must be properly inserted into its terminal for the thermostat to function properly. These wires may have become looser over time.

The wires might have been fitted improperly if the thermostat hadn’t turned on the air conditioner since installation. The RC (Red Cooling) wire is the most crucial wire that must be fault-free for AC activation. This wire could be damaged, burned, or placed in the incorrect terminal.

• You must remove the thermostat from the wall to inspect the wiring, terminals, and connections, notably the RC wire.
• Ensure the cables are properly inserted and undamaged.
• The RC terminal must be attached to turn on your HVAC system’s cooling feature.
• The system’s R wire must be connected to the thermostat’s R terminal if it has only one labeled “R” terminal and neither the RC nor RH terminals.

• The 24-volt hot terminal is this R terminal.
• The 24-volt transformer is where the power is generated, and it travels to the thermostat before reaching the other devices.

• There are more terminals on the Nest thermostat that you should examine in addition to the R, RC, and RH terminals.
• The G terminal is one of the additional terminals that frequently give your AC problems. It regulates the thermostat, the Y terminal that regulates the cooling relay in the condensing unit of your air conditioner, and the indoor blower fan relay.
• Check each thermostat terminal when you examine the wiring and connections.

6. Perform any required maintenance

If your Nest thermostat isn’t functioning properly, the exterior and interior components may require servicing. Filters must be cleaned or changed as necessary.

• As filters deteriorate over time, the ventilation system in your home may experience problems with air quality.
• Around the outer base of Nest, particularly close to any potential entry points for water, look for any damaged wiring.
• Additionally, ensure sure your Nest thermostat is the appropriate size for your setup and location.
• Check if the “Nest Thermostat Not Cooling”  issue is fixed or not.

7. Check for a tripped circuit breaker

Check the electrical board for tripped circuit breakers if your Nest isn’t turning on the heat. Your circuit breaker might just need to rest if it has been tripped.

• By cutting off power, circuit breakers are employed to safeguard electrical devices.
• An energy excess or surge could harm anything plugged into it.
• Your Nest thermostat’s components can end up burning if this occurs.
• They can occasionally turn themselves back on after a brief period, but if it won’t turn on again.
• Turn off the power to the HVAC and the Nest in the breaker box. Take the Nest down from the wall and look at the cables closely.
• Remove the wire entirely and re-insert it into the terminal if you see a loose wire. The C terminal deserves special attention.
• Find and install the common wire if it is absent.
• Check if the “Nest Thermostat Not Cooling”  issue is fixed or not.

8. Check For Blown fuse

If your Nest thermostat is still not functioning, a fuse inside the device itself may have blown. By removing the Nest thermostat’s back, you can check to determine if this is the situation. For obvious indications that it has been blown or broken, look for them.

• Turn off your system at the main breaker switch if there are no indications that it has been blown.
• If you have a flashlight, check the wall to see if anything has fallen inside.
• Additionally, check the points where the wires enter the Nest because they could become disconnected or displaced, resulting in new issues.
• Turn on the AC after letting the mixture settle for 20 minutes.
• Wait 10-20 minutes before turning on the air conditioning if the drain pan is still full.

9. Check if Nest has compatibility With the cooling system

After restarting, inspecting the wire, and carrying out the necessary maintenance, your issues persist. It might be the moment to determine whether your Nest and your air conditioner are compatible.

• The simplest approach would be to adhere to the directions provided in both items’ user manuals. 
• Follow all the instructions in the manual to determine whether an improvement has been made.
• You can also go to the compatibility checker to see your device’s compatibility.

10. Installing the Nest power connector

Make that the Nest Power Connector is set up and operating as it should. This thing will give Nest the electricity it needs to function. Installing a new connector is essential if you don’t have one of these connectors or if your wires are frayed or broken.

• The unit is probably the problem’s root if you have this issue.
• Attach a new power connector. It will aid in regulating energy flow into and out of your brand-new Nest thermostat.
• Check if the “Nest Thermostat Not Cooling”  issue is fixed or not.

11. Check Your Ac Drain Pan And Lines

Over time, condensation will cause your AC drain pan to get full with water. You will need to cleanse the drain lines since they may become clogged with leaves and dirt.

Your AC won’t operate correctly if the drain pan and drain lines fill up and become clogged. Since the temperature drops at night and the trapped water expands or freezes, the issue can get worse.

You could believe that the Nest thermostat is to blame for the problem because the fan will still operate.

• Take off the drainpipe’s lid.
• Utilize a fine wire brush to clean the drainpipe.
• Pour in a solution that is equal parts water and bleach. Additionally, vinegar can be used in place of bleach.
• Turn on the AC after letting the mixture settle for 15 minutes.
• Wait 15 minutes before turning on the air conditioning if the drain pan is still full.
• Check if the “Nest Thermostat Not Cooling”  issue is fixed or not.

12. Replace The Battery

The Nest thermostat could be unable to turn on your air conditioning if the battery is low. For the battery to function perfectly, it must supply roughly 3.6 volts. The battery in a thermostat might degrade over time as it slowly approaches the end of its useful life.

• Its voltage output is insufficient to control your AC. You need to recharge the battery or buy a new one to fix this.
• Other common issues with your battery can be as follows.
• The thermostat was unintentionally set to “heat.”
• The thermostat installed on the wall is not in contact with the battery.
• Leakage of acid into the thermostat.
• Incorrect battery insertion has occurred.
• The faulty batteries were used.
• After changing the batteries, the thermostat has not been reset.
• Check if the “Nest Thermostat Not Cooling”  issue is fixed or not.

13. Remove The Electricity-Saving Box.

Utility companies install electricity-saving boxes in HVAC systems to limit how much power you use. This may be the problem if your air conditioner operates normally during the day but not at night.

• People use power-hungry gadgets at night since it is less expensive to buy electricity then.
• If the energy-saving device notices significant power consumption, it will stop power from going to your HVAC system.
• The box is located close to the AC or breaker box. It typically contains a few red and green LEDs that flash.
• Find a specialist who can remove the box securely if you have this box.
• You can get it done by contacting the business that installed your HVAC system.
• Check if the “Nest Thermostat Not Cooling”  issue is fixed or not.

14. Ensure Nest Software Updated

This is the least likely explanation for why the Nest thermostat stopped cooling or ceased working. Updating the software is critical. Many consumers notice an abrupt loss of WiFi connection to the device. 

The cause is out-of-date software. So visit the app and select the update tab. Check to see if an upgrade is available. Check if the “Nest Thermostat Not Cooling”  issue is fixed or not.

15. Factory Reset The Nest Thermostat

You should execute a factory reset if the Nest thermostat is not cooling after ruling out every other potential cause. Perhaps a full refresh will solve the issue in under a minute. So to factory reset, adhere to the instructions below.

• Launch the NEST app on your smartphone.
• Located in the upper-left area of your home screen.
• If your home is connected to multiple homes, choose the one where the thermostat you want to remove is located.

• On the app screen, tap the thermostat you want to delete.
• Go to “Setting” now, which is in the upper right corner.
• Scroll to the bottom and down.

• You see a red option that says “All settings.”
• After you tap to confirm, the thermostat will be deleted from your Nest account.

• Check if the “Nest Thermostat Not Cooling”  issue is fixed or not.

Conclusion

There are a few reasons why the appliance might not be cooling, or worse, it might be blowing heated air instead of cold air. Because you mislabeled your wiring and used the “Heat Pump” side of your old thermostat instead of the “Conventional” side, your Nest thermostat is not cooling. To resolve the “nest thermostat not cooling” problem with Nest Thermostat, use all of the remedies listed above.

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