Nest Smart Thermostat e195 error

In the realm of smart home devices, Nest has carved out a place at the top. Their Nest Smart Thermostat is a key piece of any smart home setup. Yet, as is true with all technology, users may encounter errors. One of the most common is the ‘Nest Smart Thermostat e195 error’. This article guides you through its causes and how to fix it.

Understanding the Nest Smart Thermostat e195 Error

Before we delve into troubleshooting, let’s understand the Nest e195 error. This issue often indicates a power or connectivity problem with your device. It can disrupt your home’s heating or cooling system, causing inconvenience. Understanding what triggers this error is crucial to solving it.

Root Causes of the Nest Thermostat e195 Error

The Nest e195 error can stem from several factors. Three of the most common are highlighted below:

  • Power Issues: Often, the e195 error is a signal that your Nest Thermostat is not receiving enough power. This could be due to a worn-out wire, a blown fuse, or a malfunctioning system.
  • Wi-Fi Connectivity Issues: Another potential reason is Wi-Fi connectivity. Nest Thermostats rely on a stable internet connection. If your home Wi-Fi is inconsistent or slow, it may cause this error.
  • Faulty Base: Finally, a faulty base may lead to the Nest Thermostat e195 error. The base is the component that connects your Nest Thermostat to your HVAC system. A faulty one can disrupt this connection.

How to fix the Nest Smart Thermostat e195 Error?

Once you’ve determined the possible cause, you can attempt various solutions. Here are some fixes based on the issues mentioned above:

Fix 1: Addressing Power Issues with Nest Thermostat

When dealing with the e195 error, the first step involves checking for potential power issues. This can range from improper wiring to a faulty fuse. Here’s a step-by-step guide to help you address these issues.

  • Step 1: Check the Wiring: Firstly, turn off your thermostat for safety reasons. Once done, remove the Nest Thermostat from its base to expose the wiring. If you notice any frayed or disconnected wires, this could be the root cause of the problem.
  • Step 2: Reconnect the Wires: To fix wiring issues, reconnect any loose wires. Ensure that the wires are secure and not frayed. You might need to strip and trim the wires to make sure they’re making proper contact.
  • Step 3: Check the Fuse: After checking the wires, it’s time to inspect the fuse. Look for a small glass tube with a thin wire running through it inside the thermostat. If the wire inside appears broken or burnt, you may need to replace the fuse.
  • Step 4: Test the System: Finally, after addressing the potential power issues, reconnect your Nest Thermostat to its base. If everything is done correctly, the e195 error should no longer appear.

Please note, if you’re not comfortable with this process, it’s always recommended to hire a professional. Attempting repairs without the necessary knowledge or skill could potentially damage your system further or pose a safety risk. Safety should always be your priority when dealing with electrical devices.

Fix 2: Solving Wi-Fi Connectivity Issues

Occasionally, the Nest Smart Thermostat e195 error can be attributed to Wi-Fi connectivity problems. Below, we’ll explore how to address these in a step-by-step format.

  • Step 1: Verify Wi-Fi Connectivity: Before proceeding, it’s important to ensure your Wi-Fi is working. Check other devices in your home to see if they’re having issues connecting to the Wi-Fi. If other devices are functioning well, then the issue likely lies with your Nest Thermostat.
  • Step 2: Restart Your Wi-Fi Router: Restarting your Wi-Fi router can often resolve connectivity issues. To do this, unplug your router from the power source, wait a few minutes, then plug it back in. Allow the router a few minutes to reboot completely.
  • Step 3: Reset Nest Thermostat’s Wi-Fi: If restarting the router doesn’t work, you might need to reset the Wi-Fi settings on your Nest Thermostat. Navigate to ‘Settings’ on your Nest Thermostat, choose ‘Reset’, and then ‘Network’. Follow the prompts to complete the reset process.
  • Step 4: Reconnect to Wi-Fi: Once you’ve reset the Wi-Fi settings, try reconnecting your Nest Thermostat to your Wi-Fi network. You’ll need to input your Wi-Fi password during this process. If done correctly, your thermostat should successfully connect to the Wi-Fi.
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By following these steps, you should be able to resolve any Wi-Fi related issues causing the e195 error. If the problem persists, consider reaching out to Nest Support or your internet service provider for further assistance. Remember, proper Wi-Fi connectivity is critical for your Nest Thermostat to function optimally.

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Fix 3: Replacing a Faulty Nest Thermostat Base

Sometimes, the Nest Thermostat e195 error may be the result of a faulty base. Replacing it can resolve the problem. Here’s a step-by-step process to guide you through this solution.

  • Step 1: Purchase a New Base: Firstly, you will need a new base for your Nest Thermostat. You can purchase one from Nest’s website or other authorized dealers. Ensure the new base is compatible with your specific model.
  • Step 2: Turn Off Power: Before you start, it’s crucial to turn off the power to your thermostat for safety purposes. You can do this by switching off the relevant circuit breaker.
  • Step 3: Remove Your Nest Thermostat: Next, detach your Nest Thermostat from its current base. Do this gently to avoid damaging any components.
  • Step 4: Disconnect Wires: Now, you’ll see some wires connected to the base. Take a photo to remember their configuration, then disconnect these wires.
  • Step 5: Replace the Base: Remove the old base from the wall. Then, mount the new base, ensuring it’s level for best operation. Use the photo you took earlier to reconnect the wires in their appropriate slots.
  • Step 6: Attach Your Nest Thermostat: After reconnecting the wires, reattach your Nest Thermostat to the new base.
  • Step 7: Power On and Test: Turn the power back on and check if your Nest Thermostat is working properly. If the e195 error no longer shows, the replacement was successful.

Always remember, if you’re not comfortable handling these steps yourself, it’s advisable to call a professional or a certified Nest Pro. They can ensure the process is completed safely and correctly. This way, you reduce the risk of causing further damage to your system or harming yourself. In the world of DIY fixes, always prioritize your safety.

Fix 4: Factory Resetting Your Nest Thermostat

If all else fails, a factory reset of your Nest Thermostat might be needed to clear the e195 error. A factory reset will erase all personalized settings and restore the device to its original settings. Here’s a detailed guide on how to carry it out:

  • Step 1: Navigate to the Reset Option: Start by pressing on your thermostat to bring up the quick view menu. Scroll and select ‘Settings’. Once you’re in, scroll down until you find the ‘Reset’ option and select it.
  • Step 2: Choose the Type of Reset: In the reset menu, you’ll find different reset options. To completely restore your thermostat to its original state, choose ‘All Settings’.
  • Step 3: Confirm the Reset: The system will ask for confirmation before proceeding with the factory reset. This is because the action will erase all your personalized settings, schedules, and preferences. Confirm by selecting ‘Reset’.
  • Step 4: Set Up Your Nest Thermostat Again: After the reset, you’ll need to set up your Nest Thermostat from scratch. This includes connecting it to your Wi-Fi network, setting your location, and defining your temperature preferences.

While a factory reset can be a powerful solution, use it as a last resort. Remember that you’ll need to reconfigure your settings and preferences after the reset. If the e195 error still appears after this process, it might be time to contact Nest Support or consider purchasing a new thermostat.

Fix 5: Updating Your Nest Thermostat’s Software

At times, the Nest Thermostat e195 error could be due to outdated software. Here, we’ll explain the process of manually updating your thermostat’s software.

  • Step 1: Verify Your Wi-Fi Connectivity: First, ensure your Nest Thermostat is connected to Wi-Fi. The thermostat requires an internet connection to download and install updates.
  • Step 2: Check for Updates: Navigate to the ‘Settings’ menu on your Nest Thermostat. Scroll until you find ‘Software’, then ‘Update’. If there’s an available update, it should be visible here.
  • Step 3: Install the Update: If an update is available, select ‘Install Now’. Your thermostat will download the update and install it. During this process, do not interrupt the thermostat as it might cause installation issues.
  • Step 4: Restart Your Thermostat: Once the update is successfully installed, restart your thermostat. This ensures the new software runs smoothly.
  • Step 5: Check for the e195 Error: After the thermostat restarts, check if the e195 error still persists. If it’s gone, the software update successfully fixed the issue.
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Please note, if you’re unable to find the update option or the error continues, consider contacting Nest Support for further assistance. Always keeping your Nest Thermostat software up-to-date can prevent numerous errors and enhance its performance.

Sometimes, the Nest Thermostat e195 error could be due to issues with the Heat Link and boiler connectivity. Here’s how to resolve this.

  • Step 1: Check the Heat Link: Firstly, examine the Heat Link that’s connected to your boiler. It should be glowing blue which indicates that it’s connected to your Nest Thermostat. If it’s not, there may be a connection problem.
  • Step 2: Reconnect the Heat Link: Press the button on the Heat Link to reset its connection. If the light turns blue after this, it means your Nest Thermostat and Heat Link are now connected.
  • Step 3: Examine Your Boiler: Next, check your boiler. It should be functioning normally. If you notice any unusual noises or if it’s not generating heat, there may be an issue with the boiler itself.
  • Step 4: Contact a Professional: If the boiler isn’t working correctly, it’s best to contact a heating engineer. They can assess and fix any boiler-related issues that might be causing the e195 error.

By ensuring proper connectivity between your Nest Thermostat, Heat Link, and boiler, you can potentially resolve the e195 error. If you’re uncomfortable checking these connections yourself, don’t hesitate to seek professional assistance. Always prioritize safety and professional expertise when dealing with complex home systems.

Fix 7: Checking and Replacing Batteries

In some cases, the Nest Thermostat e195 error could be due to exhausted batteries. Follow these steps to check and replace them.

  • Step 1: Check Battery Levels: Navigate to the ‘Settings’ menu on your Nest Thermostat. Scroll and select ‘Battery’. Here, you’ll be able to see the current battery level of your device.
  • Step 2: Replace Batteries if Necessary: If the battery level is low, you will need to replace the batteries. Your Nest Thermostat uses an internal rechargeable battery. However, not all models have user-replaceable batteries. If you’re unsure, it’s best to contact Nest Support for guidance.
  • Step 3: Check for the e195 Error: After replacing the batteries, check if the e195 error is still displayed. If it’s gone, the issue was related to the battery.

While many Nest Thermostat models are designed to charge themselves from your HVAC system’s wiring, occasional issues might still arise. If you’re not comfortable replacing the battery yourself or if your model doesn’t allow user replacement, don’t hesitate to reach out to a professional for assistance. As always, safety and appropriate handling of devices should be your priority.

Fix 8: Contacting Nest Support or a Certified Nest Pro

If you’ve tried the previous solutions and the Nest Thermostat e195 error still persists, it might be time to call in the professionals. Here’s a guide on how to get help from Nest Support or a Certified Nest Pro.

  • Step 1: Prepare Your Information: Before reaching out, gather all the necessary information about your device. This includes the model number, the nature of the error, and what troubleshooting steps you’ve already taken. Having this information readily available will make the process smoother.
  • Step 2: Contact Nest Support: You can reach Nest Support through various channels. Visit their website and select the ‘Contact Us’ option. Here, you’ll find a variety of ways to connect, including email, phone, and live chat.
  • Step 3: Explain Your Problem: Once you’ve connected with a support agent, explain the e195 error and what you’ve done to try and fix it. They’ll likely guide you through additional troubleshooting steps.
  • Step 4: Schedule a Visit from a Nest Pro: If the support agent cannot resolve your issue remotely, they might suggest you contact a Certified Nest Pro. These professionals are trained to handle complex Nest Thermostat issues. Schedule an appointment for them to inspect and repair your device.
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In conclusion, while dealing with the e195 error can be frustrating, you’re never alone in solving it. Nest Support and Certified Nest Pros are always ready to assist. When in doubt, don’t hesitate to reach out to them for a quick, efficient resolution to your issue.

Preventing the Nest Thermostat e195 error

While troubleshooting can fix the Nest Thermostat e195 error, it’s always better to prevent the issue from occurring in the first place. Here are some proactive tips to help you avoid running into this error.

  • Regularly Update Your Thermostat’s Software: Always keep your Nest Thermostat’s software updated. Nest frequently releases updates to enhance performance and fix bugs. Regular updates can prevent many errors, including the e195 error.
  • Ensure Stable Wi-Fi Connection: Ensure that your Nest Thermostat has a consistent and stable Wi-Fi connection. This is crucial for its proper functioning and for receiving important software updates.
  • Check Wiring Regularly: Regularly inspect the wiring of your Nest Thermostat. Frayed or loose wires can cause various errors. Ensuring the wires are in good condition and properly connected can prevent potential issues.
  • Regularly Inspect Your Boiler and Heat Link: Frequent checks of your boiler and Heat Link can preemptively detect any issues. If you notice any irregularities during your inspections, address them immediately before they cause errors.
  • Schedule Regular Maintenance: Consider scheduling regular professional maintenance for your entire HVAC system, including the Nest Thermostat. Regular maintenance can spot and rectify potential issues early, preventing errors down the line.

By following these preventative tips, you can avoid running into the e195 error and ensure that your Nest Thermostat functions optimally at all times. Prevention is always better than cure, especially when it comes to maintaining your home’s comfort and efficiency.


Encountering the Nest e195 error can be frustrating. However, understanding the potential causes and how to fix them can quickly restore your smart home system’s functionality. If you’re still experiencing the issue after trying these solutions, contacting Nest Support or a certified Nest Pro may be your best bet. Remember, prevention is always better than cure. Regular device maintenance can ward off many common issues, ensuring your Nest Smart Thermostat operates smoothly.


What does the e195 error mean on my Nest Thermostat?

The e195 error usually indicates a power or wiring issue with your Nest Thermostat.

Can I fix the e195 error by myself?

Yes, there are several DIY fixes you can try, like checking the wiring or resetting your device.

When should I contact a professional?

If DIY fixes don’t work, or you’re uncomfortable trying them, it’s best to call a professional.

How do I know if it’s a wiring issue?

Inspect the wires for any loose connections or frays. If you find any, it might be a wiring issue.

Can updating my Nest Thermostat’s software fix the e195 error?

Yes, sometimes outdated software can cause the e195 error. Updating the software may fix it.

Can a faulty base cause the e195 error?

Yes, a faulty base can cause the e195 error. If suspected, consider replacing it.