Causes and Fixes: Nest Not Cooling to Set Temperature

Having a thermostat like Nest is convenient especially when you live in a cold country. However, there are times when you would like to cool down and lower down the temperature. Just like any other devices and technology, Nest could also encounter some issues. Do not worry as through this article, we shall provide you useful information about Nest not cooling to set temperatures, causes and fixes.

Why is My Nest Thermostat Not Cooling to Set Temperature?

There are severals reasons as to why your Nest thermostat is not cooling. However, one main reason could be due to it not knowing nor could it recognized how your home’s cooling system is. This could lead to mislabeling and misplacing wires. Another reason is that your circuit breaker could be turned off or your air handler has a broken fuse. Another reason could be due to wrong temperature schedules.

Nest Not Cooling to Set Temperature

Not Identifying Your Cooling System Correctly

It is important when installing your Nest, you do it correctly and ensure that you have researched about your cooling system. This way you would not mislabel the wires. Mislabeling wires could be a result to installing wires incorrectly. Hence, we highly suggest for you to take time to learn about your cooling system.

Getting to Know You System

First thing you should do is to identify what cooling system you have. Usually, you will be able to find this outside your home. Check the label and ensure you know if it is an air conditioner or heat pump. If there is no label, you could check the brand name and model number in Google. Another way is by turning on the heating of your house. If the system outside runs then that is your heat pump.

Re-labeling your Nest Thermostat Wires

Now that you have your cooling system’s name, re-label your Thermostat’s wiring with the use of sticky tape and pen. We suggest to take photo of it with the notes of your original set up for reference. Open the Google’s Nest Compatibility Checker and follow instructions

Rewiring your Nest Thermostat

No, do not touch the wires yet as you will have to turn off your circuit breaker first. Remember you will have to exercise caution and safety in everything that you do. Once this is done, remove your Nest’s display screen and then, reconnect your wires. Ensure that you use the guide from Google’s Compatibility checker. Once all of your wires are in place, double check if all of them are secured. Place your Nest’s display screen back. Turn your circuit breaker on and your Nest Thermostat. Wait for it to boot and check if your room is cooling down.

Flipped Circuit Breaker

Your circuit breaker is a box that comes with many switches. Switches are actually called breakers. Your circuit breaker would protect you from any electrical issues. This is possible as it is connected to all of your wires in your home. If your breakers trip, your device might not work.

Take a Look at your Circuit Breaker

This is usually located at a less crowded room like garage or basement. Sometimes, this could be found outside. It looks like a grey and mounted box on the wall. Open the cover and look for flipped breakers in the off position. Turn them to on position.

Wrong RC and RH Wiring

RH stands for red heating. This is a connection that powers the heating of your Nest Thermostat and RC means red cooling which allows the cooling system to operate. Keep in mind that R wire is required for the RC port and the RH port.

Put the red wire in place

Turn off your Nest Thermostat first and cut its power source. Then, remove the thermostat screen. Leave the main grid on. In it you will find different ports with labels. Look for RC and RH port. Then look for the R wire. This wire is color red.

Old thermostats’ R wire is usually connected to both RC and RH ports which is bridged by a jumper. In the Nest’s thermostat, you would need two R wires which you could find in their ports. Ensure that they are secured in their correct ports. If you only have one, place it in the RH port. Once done, turn on your circuit breaker and then your Thermostat. If it did not work try to place the R wire to the RC port.

Broken Fuse in the Air Handler

Your Air Handler is the one that spreads and controls the air in your home. It provides your heating and cooling. Your Air Handler is a big box like your circuit breaker which could also be found either in your attic, basement or garage. Check the inside and ensure that there is no blown fuse.

Search For Damaged Fuse

Take off the cover of your home’s air handler. Take note that this could be a little bit challenging as the cover is usually closed with many screws. If you cannot do it yourself, we suggest that you could get a professional or pro to do it. Inspect all the fuses and check if there are any damages like it being colored black or signs of burns. Take out the broken fuse and replace them. You could do this yourself and if you are not confident to do it yourself, you could hire an electrician.

System slowing down

If you have checked everything and your thermostat is still acting up, then, it could be that the problem is not in the hardware but rather the issue could be your software.

Your system could get overloaded which means it needs to have a breather. Hence, try to let your Nest thermostat rest for a bit. Also, we suggest that you check if the tech company has updated the software which you could have missed.

Restart The Thermostat

Turn off your thermostat and wait for about five minutes then turn it back on. Wait for it to start cooling.

Update the thermostat

Updating of your Nest thermostat could be done automatically especially when it is connected to WiFi. However, there are times when it needs a manual update. Hence, we suggest to check if you have any pending updates. To do this, open your Home or Nest app and select settings and go to technical info or device information and there you would find the current version and if there is a pending update. Update it by tapping the update button.

Reset the Thermostat

By resetting your thermostat, your device’s settings would go back to its original settings. To do this, ensure first that you take note of your preferred settings. Then, go to settings and select equipment. Press your thermostat ring and go to the quick view menu and select settings then turn the ring to reset and press.

Thermometer placed in a warmer spot

It is discouraged for you to place your thermostat in a warm place. Do not mount it near a window that is facing the sun. Keep in mind that your thermostat could detect your wall’s temperature.

Put it in a spot that is not too cold nor too hot. These are just some of the areas you would need to avoid putting your thermostat at.

  • Air vents
  • Doors
  • Hallways
  • Windows
  • Kitchen
  • Direct sunlight

Mistake in Temperature Schedule

If you have tried everything in the list that we have in this article and nothing worked, then it could be you have set up a temperature schedule. Hence, we suggest that you check it out and adjust the temperature schedule according to your preference.

Check the Temperature Schedule

For Nest Thermostat

  • Go to your Home Screen
  • Select your thermostat
  • Select settings and schedule

For Nest Thermostat E

  • Go to Quick View menu
  • Select settings
  • Select schedule

For Nest Learning Thermostat

  • Open Quick View Menu
  • Choose Schedule
  • Check your chosen time

Change the Temperature Schedule

For Nest Thermostat

  • Tap day you would like to change
  • Select temperature you want
  • Change the time
  • Save changes

For Nest E and Nest Learning Thermostat

  • Press down to select the day
  • Tap change to adjust
  • Turn ring to choose the time and temperature
  • Tap done after every change
  • Turn the ring to save changes


Why does Nest take 2 hours to cool?

This means there is a delay in cooling process. This usually happens when there is a drastic change in the settings.

How Do You Force Nest to Cool?

You could force your Nest by restarting it.

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