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Got Nest Thermostat low-battery error? Here’s how to fix

Nest has become a popular choice for thermostats. And considering all the features and quality it offers, it’s not a surprise that people love it! But like everything else, even Nest has its ups and downs!

If you have a thermostat from the brand, you have probably come across a pickle of a situation: continuously low battery. And while it may be an annoying situation, it’s not that hard to tackle.

Why does my nest thermostat keep saying low battery?

Most people don’t know this, but Nest thermostats are battery-powered. However, they are also connected to a base unit that recharges it. Because of this fact, users don’t have to replace or recharge their batteries manually. This is how the mechanism works typically. In rare cases, when things go wrong, your thermostat starts displaying a warning “Low Battery.”

So, all in all, there are many reasons why your thermostat might show this warning. But in most cases, the most prominent cause is the base unit not doing its job correctly. So, when you know the reason behind the problem, it’s easier to address it and solve it accordingly.

How to fix your Nest Thermostat

Depending on the primary cause, there are many ways to address the situation and fix it. The following are the most effective ways recommended by experts:

Manual charging As mentioned earlier, users don’t have to recharge their battery because of the base unit manually. But if things go south, manual charging is a good way to solve the situation. If you haven’t used the HVAC for a very long time or have been in the storage for quite a while, you can recharge the thermostat manually. First, check your battery’s voltage. If it’s anywhere below 3.6 volts, there is a high chance that your unit may not recharge from its base unit. You might have to give it a “push” yourself!

Charging the thermostat using its charging port

  • You just have to remove the thermostat from its base unit.
  • Plug its charger and connect it to the wall socket
  • Then, you are supposed to connect the charger to the thermostat’s rear end, where the micro-USB port is.
  • Notice when the blinking red light suddenly comes to a halt; this would mean that the unit has finished charging. Usually, it takes about 30 minutes to 2 hours.

Depending on the model you own, you can use typical USB cables or phone chargers to do this. However, if you own an old Nest unit, it might not have a USB port. In such cases, you will have to get a particular battery charger unit.

Using a 24 volt transformer

The second best option is to use a plain 24-volt transformer. As straightforward and basic as it may sound, this method is actually quite effective! It can help provide an adequate and constant supply to your thermostat. Here is how you can go about it:

  • Ensure that you turn the power switch off before beginning; this part is essential for your safety.
  • Remove your thermostat from its base unit.
  • Push the cables behind the base unit and pull them out through the hole in the center.
  • If you see a cable attached to an Rh connector, make sure you disconnect it very carefully. Then, push it back and tie it up safely.
  • Take one transformer cable and connect it to the Rh connector and the other to the C connector.
  • Plug your transformer into the main outlet and switch it on.
  • Reattach the thermostat to the base unit and see if it’s working correctly. If the indicator light starts flashing, the startup process has successfully begun.

An important fact about this method is that you need to manage the cables afterward. Otherwise, it’s easy for people to trip, fall, and hurt themselves.

Resetting the thermostat

This may sound cliche, but turning the thermostat off and back on is usually a very effective way to solve the problem. You don’t even have to do anything else most of the time. Resetting your thermostat works like magic! Usually, there is a software issue with Nest thermostats which causes the batteries to stop charging, and the units don’t respond. Even though the company has been trying to fix this problem, manufacturers recommend resetting and restarting the unit as a temporary solution. Here’s how you can reset the thermostat:

  • If you have a flat thermostat battery, carefully remove it from its base unit.
  • Recharge the battery and re-adjust it.
  • Next, press the ring on the thermostat, and you will see the main menu pop up.
  • Turn the ring until it lands on Settings and select it.
  • Turn the ring again and select Reset.
  • Then, select Restart.
  • Next, you’re going to have to make a choice: you can either restart the device without losing any of your data. Or, you can factory reset the whole unit, reboot the thermostat and delete everything.

Some other methods

If resetting the thermostat does not work, nor does anything else, there are different ways to address the issue without calling a professional. Firstly, you can try installing the C wire. Or, you can also try bypassing this method by switching your G connector. Although, these methods are not safe to try if you don’t know much about electricity and mechanical systems. They’re much more complex than all the other solutions mentioned above. Hence, it’s better to leave it to the professionals.

Final thought

Overall, it is not rare for Nest thermostats to show a low battery warning out of nowhere. Many people find it very stressful because they don’t know what to do about it. Calling a professional to check it out can cost you money, and you will probably have to wait a lot. So, having basic information about addressing the issue yourself can save you the pain!

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