Nest Blowing Hot Air On Cool: How To Fix It Quickly

The Nest Thermostat has been installed in my home for a while now. All I want to do when I get home from a hard day’s work is relax in a cool, comfortable environment.

By turning off the air conditioning and heating systems when no one is home, I can use this gadget to save a ton of money without sacrificing comfort.

Unfortunately, last week, my Nest Thermostat stopped responding. I spent several hours online trying to find a solution to the problem because I had no idea what was going on.

The Nest Thermostat’s inability to cool can be remedied by inspecting the wiring, checking the circuit breaker, and, if necessary, replacing the fuse. There’s also the option of resetting or restarting the Nest Thermostat.

One of the wisest purchases I’ve ever made was the acquisition and installation of a thermostat in my residence.

It came as a surprise to me to discover a plethora of guides that claim to assist you in repairing the Nest Thermostat.

In point of fact, out of all of the threads and blogs, only a select few contained the actual information that both you and I could use to diagnose the issue.

As a result, I have provided you with a few potential solutions to consider.

But you also need to make sure there are no coolant leaks and no dirty filters in your HVAC system. You’ll find a further explanation of this below.

But before we get there, there’s one more thing you must do.

Check The Wiring Of Your Thermostat

Nest Blowing Hot Air On Cool

Checking for loose wire connections is the first step before we dive into complex and time-consuming solutions. The Nest Thermostat would fail to work if wires are wrongly installed. Here’s how you can check the wires of the device.

  • Turn off the Nest Thermostat from the power source before handling the electricals.
  • Prepare to remove the front display panel. This will let you access the wires of the thermostat.
  • Firstly, identify the voltage type: high or low. If your device is connected through high-voltage power, you’ll find about two to four thick cables of the same colors.
  • Low voltage systems have multiple wires of different colors, mostly thin in size.
  • Once you’ve identified the wires, you can move on to the next step of rewiring.

If your thermostat needs a C wire, check those connections as well. This can help with fixing your Nest thermostat if it shows a low battery message as well.

Rewire your Nest Thermostat

If your thermostat isn’t getting the power it requires, you may need to rewire your thermostat. Examine the wires thoroughly before proceeding with this procedure. Corrosion or other obvious damage is not acceptable.

If your home’s thermostat wiring is older, you may want to recheck its compatibility.

Google’s compatibility tool can help you determine the best way to wire your system. In that order, unplug the wires and ease them back into their original slots.

Checking the wire’s flexibility is one way to tell if it was inserted correctly. After being inserted, the wires shouldn’t wiggle around.

The majority of people who have trouble regulating the temperature in their homes can get rid of the problem by having the wiring redone.

If for some reason this doesn’t restore your device to normal operation, try the following alternatives. See what color the blinking LEDs are if you can.

If your Nest thermostat is flashing red instead of green, you should take that as a warning.

Ensure Your Circuit Breaker is Working

Even if your thermostat is fine, a tripped circuit breaker could be the root of your cooling woes.

Before turning on your home’s air conditioner, heater, or fan, check the breaker box. In order to find the location of the switch, you must first open the breaker box.

Put the switch in its original position and turn it off. Personally, I’ve tried this method and it took all of a few seconds to start working.

Now that you’ve safely shut off the breaker box, try turning on your Nest thermostat again to see if it’s working.

No Power to RC Wire

If you have a Nest Thermostat and the display shows “No Power To Wire” or the error code E73, check your HVAC fuse, air filter, and drain pipe.

Turn off the Nest Thermostat and give it a quick once-over before we dive into the fix. Take a look at the red wire by removing the thermostat panel from the wall.

The RC or RH jack is where you should plug it in.

If cooling has stopped due to a “No Power to RC wire” error, check the R wire and clean the drain tubes and drip pans.

Verify Fuse Inside Air Handler For Any Damage

One blown fuse can render your entire heating, ventilation, and air conditioning system inoperable. Fuse monitoring for your air handler is essential.

The first thing you need to do is disconnect the power to the HVAC unit. This will allow you to access the fuse and other electrical components without risk.

The door to the HVAC system’s control panel is finally open. Find the control board and the fuse by consulting the user manual. Keep a close eye on the fuse.

When a fuse shows signs of discoloration or burns, it needs to be replaced. The panel must be shut before the thermostat can be used, and the circuit breaker must be turned on before the thermostat can be plugged in.

Install New Air Filters

After prolonged use, the air filters in your air conditioner are likely to become clogged. You shouldn’t panic if your HVAC system isn’t performing at peak efficiency because of dirty filters.

In order to keep your air conditioner running smoothly, you should check the condition of the air filters regularly and replace them as needed.

You can usually find the HVAC system’s air filters in the ductwork that returns conditioned air to the room. The air filter in the HVAC system should also be maintained.

If this is your first time changing the air filters, get in touch with an HVAC technician; they will be able to simplify the process significantly.

Verify For Any Coolant Leaks

A properly functioning air conditioner relies on having the right amount of coolant. If there is a leak in the pipes, the coolant could slowly drain away, rendering your air conditioner ineffective even after prolonged use.

Locating coolant leaks in the HVAC system will require inspection. Less or no cooling will occur if the coolant leaks. As this is a time-consuming process, you may wish to hire a professional to assist you in locating the source of the leak.

Restart the Nest Thermostat

Nest Thermostat issues can often be fixed by simply restarting the device. You can try restarting your Nest Thermostat from the app on your phone if it becomes unresponsive, stuck, or unable to connect to the internet.

Here’s how to power down and then power up your Nest thermostat again.

  • Open the Nest app on your iOS or Android mobile.
  • Click on the Settings menu.
  • Now select Restart.

Just let the thermostat finish restarting, and then give the cool setting a shot.

Finally, Reset the Nest Thermostat

If that doesn’t fix it, resetting your Nest thermostat might be the next best thing. Select the “Reset” option from the Nest app’s “Settings” menu. If you press this button, your thermostat will be reset.

It’s important to remember that resetting your Nest Thermostat could wipe out all of your custom settings, just like it would on any other device.

If you want to actually reset your thermostat, you’ll need to do the following first:

  • Press the thermostat ring to open the menu.
  • Go to Settings > Reset.
  • Choose All Settings.

A fresh reboot will restore the device to its original, default state.

Contact Customer Support

If you still need assistance after trying the aforementioned steps, you can always reach out to the Google Nest support team for further guidance.

Describe the problem you’re having and the steps you’ve taken to address it so far.

They could advise further troubleshooting steps, after which a technician would be dispatched to inspect your thermostat.

Final Thoughts On Nest Thermostat Not Cooling

When it comes to high-tech air conditioning, many people swear by the Nest Thermostat.

The product has an automatic on/off feature that can save you money on your energy bill and comes with a warranty that covers the purchase price plus two years.

Though I did find many positive reviews, I also read many that criticized the device’s efficiency over time in comparison to other programmable thermostats like Honeywell’s and Ecobee’s.

One common complaint was that after installing an update, their Nest Thermostat suddenly stopped responding to their commands.

In that case, you can experiment with thermostats other than the Nest Thermostat until you find one that works well with your air conditioning and heating unit.

Further Read:

  1. Does Google Nest Thermostat Work Without WiFi Or Internet
  2. How To Turn Eco Mode Off On The Nest Thermostat
  3. How To Reset Nest Thermostat Without Pin or App
  4. How To Manually Override A Nest Thermostat
  5. Does Verizon Run a Credit Check

Frequently Asked Questions

How do you force Nest to cool off?

Your Nest Thermostat has a menu button that you can use to toggle between settings like heating and cooling, as well as turn the device on and off. Choose the option labeled “Cool” from the menu.

How do you reset a Nest thermostat that is locked?

Using the Nest app on any iOS or Android device or the web interface, you can easily reset your Nest Thermostat.

How do I get my Nest thermostat to hold the temperature?

By selecting the hold option from the main menu, you can maintain the current temperature for a set amount of time. The hold time can be customized in this manner.

Why does my Nest Thermostat keep going into an eco mode?

Due to sensor issues or dated firmware, your Nest Thermostat may keep switching to Eco mode.

How do I override my Nest Thermostat?

In order to disable the Nest Thermostat, you must use the unit’s factory reset function.

How do I reset my Nest thermostat schedule?

Getting rid of the temperatures you’ve previously set on the Nest thermostat will delete the schedule you’ve made.