E73 nest error: The nest said no power to the wifi

Are you encountering the frustrating E73 Nest error, with your Nest thermostat telling you there’s no power to the Wi-Fi? If you’re stuck in this perplexing situation, fear not! In this comprehensive guide, we’ll delve into the root causes of the E73 Nest error and provide you with detailed procedures to fix it. Whether you’re a tech enthusiast or a homeowner seeking a quick solution, this article will help you understand and resolve this issue step by step.

What is E73 Nest Error

Before we dive into troubleshooting, it’s crucial to grasp the basics of the E73 Nest error. This error typically occurs when your Nest thermostat is unable to connect to your Wi-Fi network due to a power-related issue. It can be an annoying roadblock, especially when you rely on your thermostat for efficient heating and cooling. To tackle this problem effectively, let’s explore the possible causes.

e73 nest error

Common Causes of the E73 Nest Error

  1. Power Supply Interruption: One of the most common reasons for the E73 error is a power supply interruption. This could be due to a tripped circuit breaker, a blown fuse, or a disconnected power cable. Ensuring a stable power supply is the first step in resolving this issue.
  2. Wi-Fi Network Issues: Sometimes, the problem may not lie with your Nest thermostat but with your Wi-Fi network. A weak or inconsistent Wi-Fi signal can prevent the thermostat from connecting, leading to the E73 error.
  3. Compatibility Issues: Incompatibility between your Nest thermostat and your HVAC system can also trigger this error. Ensure that your thermostat is compatible with your heating and cooling equipment.
  4. Software Glitches: Like any electronic device, Nest thermostats can encounter software glitches. These glitches may disrupt the device’s ability to communicate with your Wi-Fi network.
  5. Faulty Wiring: Incorrect or faulty wiring can lead to power supply issues, which, in turn, can trigger the E73 error. Double-check your thermostat’s wiring to rule out this possibility.

How to Fix E73 Nest Error?

Now that we’ve identified the potential causes let’s proceed with fixing the E73 Nest error. Follow these steps to regain control of your thermostat and restore the connection to your Wi-Fi network.

Fix 1: Verify Power Supply

Ensuring a stable power supply is crucial in resolving the E73 Nest error. Follow these detailed steps to verify and rectify any power-related issues:

Step 1: Check the Circuit Breaker and Fuse

Start by locating your home’s circuit breaker panel. Typically, it’s situated in a utility room, basement, or garage. Look for the circuit breaker that controls the HVAC system or the area where your Nest thermostat is installed.

  1. Turn Off the Thermostat: Before touching any electrical components, it’s essential to turn off your Nest thermostat. Go to the thermostat’s settings and set it to “Off.”
  2. Identify the Correct Circuit Breaker: Carefully inspect the labels on the circuit breaker panel to identify the one corresponding to your HVAC system. It should be clearly labeled as “HVAC,” “Heating,” or “Cooling.”
  3. Reset the Circuit Breaker: If the breaker is in the “Off” position, flip it to the “On” position. If it was already in the “On” position, switch it off and then back on to reset it. A tripped circuit breaker can sometimes cause the E73 error.
  4. Check for Blown Fuses: If your HVAC system uses fuses instead of circuit breakers, inspect the fuses connected to it. A blown fuse can also lead to a power supply interruption. Replace any blown fuses with new ones of the same amperage rating.

Step 2: Inspect the Thermostat’s Power Cable

  1. Turn Off the HVAC System: To safely inspect the thermostat’s power cable, turn off your HVAC system at the circuit breaker or by following the manufacturer’s instructions.
  2. Access the Thermostat: Carefully remove the Nest thermostat from its baseplate. You may need to gently pull or squeeze the sides, depending on your model.
  3. Examine the Wiring: Inspect the wires connected to the thermostat’s baseplate. Ensure that each wire is securely attached to its designated terminal. If any wire appears loose or disconnected, firmly reattach it.
  4. Check for Damage: While inspecting the wiring, look for any signs of damage, such as frayed wires or exposed conductors. If you notice any issues, it’s essential to address them promptly. Replace damaged wires as needed.
  5. Reattach and Power On: After verifying the wiring, reattach the thermostat to its baseplate and power on the HVAC system.

By following these detailed steps to verify your power supply, you’ll have taken the first and crucial step in resolving the E73 Nest error. If the error persists, proceed to the next troubleshooting steps to address other potential causes.

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Fix 2: Assess Wi-Fi Signal Strength

Weak or intermittent Wi-Fi signals can often be the culprits behind the E73 Nest error. To ensure a robust connection, follow these comprehensive steps:

Step 1: Locate Your Wi-Fi Router

Identify the location of your Wi-Fi router within your home. It’s typically situated in a central area for optimal coverage. Ensure it’s not obstructed by physical barriers like walls or furniture.

Step 2: Check Wi-Fi Signal Strength

  1. Access Your Nest Thermostat Settings: On your Nest thermostat, navigate to the settings menu.
  2. Select “Network”: Look for the “Network” option in the settings menu and select it.
  3. Check Signal Strength: Your Nest thermostat will display the signal strength of your Wi-Fi network. Ideally, you want a strong and stable signal. If it’s weak or fluctuating, consider these actions:
    • Relocate the Router: If the signal is consistently weak in the area where your thermostat is installed, consider moving your router closer to it. Ensure there are minimal obstructions between the router and the thermostat.
    • Use Wi-Fi Extenders: Wi-Fi extenders or repeaters can boost your Wi-Fi signal’s reach. Place them strategically to enhance coverage in the problem area.
    • Upgrade Your Router: If your router is outdated or doesn’t support the latest Wi-Fi standards, upgrading to a newer model can significantly improve signal strength and reliability.
    • Reduce Interference: Minimize interference from other electronic devices or neighboring networks by selecting the least congested Wi-Fi channel within your router’s settings.

Step 3: Reconnect Your Nest Thermostat

  1. Go to the “Network” Menu: Return to your Nest thermostat’s “Network” menu.
  2. Select Your Wi-Fi Network: Choose your Wi-Fi network from the list of available networks.
  3. Enter Wi-Fi Password: If prompted, enter your Wi-Fi password accurately. Double-check for typos.
  4. Connection Test: Allow your thermostat to connect to the Wi-Fi network. It will perform a connection test. If successful, the E73 error should resolve.

By thoroughly assessing your Wi-Fi signal strength and taking appropriate actions, you can eliminate poor connectivity as a potential cause of the E73 Nest error. If the error persists, proceed to explore other troubleshooting steps to get your Nest thermostat back in working order.

Fix 3: Ensure Compatibility

Incompatibility between your Nest thermostat and your HVAC system can be a root cause of the E73 error. Follow these detailed steps to ensure compatibility:

Step 1: Check HVAC Compatibility

  1. Locate HVAC Information: Find information about your HVAC system, including the make and model of your furnace and air conditioning unit. This information is typically available on labels or nameplates on the equipment itself.
  2. Visit the Nest Compatibility Checker: Go to the official Nest website and access their compatibility checker tool. This tool allows you to verify whether your HVAC system is compatible with your Nest thermostat model.
  3. Enter Information: Input the details of your HVAC system, including the make and model. The tool will provide compatibility information based on the data you provide.
  4. Review Compatibility: The tool will provide a compatibility status. If your HVAC system is listed as compatible, you can move on to the next steps. If it’s listed as incompatible, you may need to consider alternative thermostat options or consult with a professional HVAC technician for possible workarounds.

Step 2: Check Wiring Compatibility

Follow steps:

  1. Verify Wiring Compatibility: Ensure that the wiring of your HVAC system matches the wiring requirements of your Nest thermostat. Consult your thermostat’s user manual for guidance on the correct wiring configuration.
  2. Inspect Wiring Connections: Carefully inspect the wiring connections at both the thermostat and the HVAC control board. Make sure each wire is correctly connected to its designated terminal.
  3. Check for Adapters: Some Nest thermostat models come with adapters that can be used to bridge compatibility gaps between your HVAC system and the thermostat. Check if your thermostat includes such an adapter and install it if necessary.

Step 3: Professional Assistance

If you discover that your HVAC system is not compatible with your Nest thermostat or if you are unsure about the wiring configuration, it’s advisable to seek professional assistance. Contact an HVAC technician who can assess your system and recommend appropriate solutions. This may involve upgrading certain components or exploring alternative thermostat options that are compatible with your setup.

By diligently ensuring compatibility between your Nest thermostat and your HVAC system, you can eliminate potential compatibility issues as the cause of the E73 Nest error. If the error persists, proceed with other troubleshooting steps to pinpoint and resolve the issue.

Fix 4: Update Firmware

Outdated firmware can sometimes lead to connectivity issues and errors like E73. Updating your Nest thermostat’s firmware can help resolve these problems. Here’s how to do it:

  • Step 1: Check Current Firmware Version:
    • Access your Nest thermostat’s settings menu.
    • Navigate to “Software” or “Firmware.”
    • Check the current firmware version. Make a note of it for reference.
  • Step 2: Connect to Wi-Fi: Ensure your thermostat is connected to your Wi-Fi network. If not, follow the steps to connect it.
  • Step 3: Update Firmware:
    • In the “Software” or “Firmware” menu, look for an option to check for updates.
    • If an update is available, follow the prompts to initiate the update. This process may take a few minutes.
  • Step 4: Verify Update: After the update is complete, verify that your Nest thermostat is functioning correctly, and the E73 error is resolved.
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Updating your firmware can often fix software-related issues that may cause the E73 error. If the error persists, proceed with the next troubleshooting steps.

Fix 5: Wi-Fi Network Maintenance

Regular maintenance of your Wi-Fi network can improve its stability and reduce the likelihood of connectivity problems. Follow these steps to ensure your network is operating at its best:

  • Step 1: Router Firmware Update:
    • Access your Wi-Fi router’s settings. You can usually do this by typing the router’s IP address into a web browser.
    • Check for firmware updates within the router settings and apply them if available.
  • Step 2: Optimize Wi-Fi Channels:
    • Access your router’s settings again.
    • Review the channels your Wi-Fi network is using. Choose the least congested channel to reduce interference.
    • Save the changes and restart your router.
  • Step 3: Password Security:
    • Ensure your Wi-Fi network has a strong, unique password to prevent unauthorized access.
    • Consider changing your Wi-Fi password regularly for added security.
  • Step 4: Positioning and Range Extenders:
    • Place your Wi-Fi router in a central location to provide better coverage throughout your home.
    • If necessary, invest in Wi-Fi range extenders to boost coverage in areas with weak signals.
  • Step 5: Network Optimization:
    • Disable unnecessary devices or features on your network that may be consuming excessive bandwidth.
    • Prioritize your Nest thermostat on your network to ensure it has a stable connection.

By optimizing your Wi-Fi network, you can reduce the chances of encountering the E73 error due to network-related issues.

Fix 6: Verify Wiring (Again)

Double-checking your thermostat’s wiring is essential to eliminate wiring-related problems. Follow these steps:

  • Step 1: Power Off: Turn off your HVAC system at the circuit breaker or as per the manufacturer’s instructions.
  • Step 2: Access Thermostat Wiring:
    • Carefully remove your Nest thermostat from its baseplate.
    • Inspect the wiring connections, ensuring each wire is securely attached to its designated terminal.
  • Step 3: Check for Damage: Examine the wires for any signs of damage, such as fraying or exposed conductors. Replace damaged wires as needed.
  • Step 4: Reattach and Power On:
    • Reattach the thermostat to its baseplate.
    • Power on your HVAC system and monitor your thermostat for any error messages, including E73.

By revisiting the wiring and ensuring it’s in perfect order, you can rule out any overlooked issues in this critical area. If the E73 error persists, consider seeking professional assistance or contacting Nest support for further guidance.

Fix 7: Perform a Factory Reset

Performing a factory reset on your Nest thermostat can help resolve software glitches that may lead to the E73 error. Follow these detailed steps to reset your thermostat:

  • Step 1: Access the Thermostat Settings:
    • Navigate to the Main Menu: On your Nest thermostat, access the main menu by pressing on the device’s screen to wake it up.
    • Choose “Settings”: Scroll through the menu options until you find “Settings.” Tap on it to enter the settings menu.
  • Step 2: Initiate the Factory Reset:
    • Select “Reset”: Within the settings menu, look for the “Reset” option. It may also be labeled as “Reset to Factory Defaults” or something similar. Tap on this option.
    • Confirm the Reset: Your thermostat will provide a warning that resetting will erase all settings and data. Confirm that you wish to proceed with the reset.
    • Follow On-Screen Prompts: The thermostat will guide you through the factory reset process, which may involve a series of confirmation prompts. Follow these prompts carefully.
  • Step 3: Reconfigure Your Thermostat:
    • Connect to Wi-Fi: After the factory reset, your Nest thermostat will need to be reconfigured. Follow the on-screen instructions to connect it to your Wi-Fi network.
    • Set Up Preferences: Re-enter your preferred settings for temperature, scheduling, and other thermostat functions.
    • Test Connectivity: Allow your thermostat to connect to the Wi-Fi network and perform a connection test. Ensure that the E73 error is resolved and that your thermostat can communicate with the network seamlessly.

Performing a factory reset can often resolve software issues and restore your Nest thermostat’s functionality. If, after following these steps, the E73 error persists, proceed to further troubleshooting or consider contacting Nest customer support for additional guidance.

Fix 8: Contact Nest Support

If you’ve diligently followed the previous troubleshooting steps and the E73 Nest error still persists, it’s time to reach out to Nest support for expert assistance. Here’s how to do it:

Step 1: Gather Information

Before contacting Nest support, gather essential information to expedite the process:

  1. Thermostat Model: Note down the exact model of your Nest thermostat. You can usually find this information on the thermostat’s display or in its user manual.
  2. Serial Number: Locate the serial number of your Nest thermostat. It’s often printed on the device or available in the thermostat’s settings menu.
  3. Error Details: Be prepared to explain the error in detail, including when it first occurred, any changes you made before the error, and any troubleshooting steps you’ve already taken.

Step 2: Contact Nest Support

  1. Visit the Nest Support Website: Go to the official Nest support website (usually nest.com/support).
  2. Choose Contact Options: Browse the support options available, such as live chat, phone support, or email support. Select the one that best suits your preferences.
  3. Provide Information: When you contact Nest support, provide the information you gathered in Step 1. Describe the E73 error and any troubleshooting steps you’ve taken.
  4. Follow Support Guidance: Nest support will guide you through additional troubleshooting steps over the phone or through other communication channels. They may also provide specific solutions or arrange for a replacement if your thermostat is under warranty.
  5. Follow-Up as Needed: If the issue isn’t resolved immediately, be prepared to follow up with any additional information or steps recommended by Nest support.
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Nest’s dedicated support team is well-equipped to assist with more complex issues like the E73 error. They have access to extensive resources and can provide personalized guidance to help you get your Nest thermostat back to full functionality.

While the E73 Nest error can be frustrating, it’s important to follow a systematic approach to troubleshoot and resolve the issue. By reaching out to Nest support as a final step, you can ensure that you’ve explored all possible solutions and receive expert assistance to restore your thermostat’s normal operation.

Preventive Tips to Avoid the E73 Nest Error

Preventing the E73 Nest error is often more desirable than dealing with it once it occurs. Here are some valuable tips to help you maintain a smooth operation of your Nest thermostat:

  • Regular Maintenance: Perform routine checks and maintenance of your HVAC system to ensure it operates smoothly and avoids potential disruptions.
  • Wi-Fi Network Health:
    • Keep your Wi-Fi router firmware up-to-date to maintain a stable connection.
    • Monitor your network for interference and switch to less congested channels when needed.
    • Secure your Wi-Fi network with a strong password to prevent unauthorized access.
  • Firmware Updates: Regularly check for firmware updates for your Nest thermostat and apply them to keep it running optimally.
  • Compatibility Checks: Before purchasing a Nest thermostat, ensure it’s compatible with your HVAC system to avoid compatibility issues down the line.
  • Proper Installation: If you’re installing a Nest thermostat yourself, follow the installation instructions meticulously, paying special attention to wiring.
  • Wiring Inspection: Periodically inspect the wiring of your thermostat to ensure all connections remain secure and undamaged.
  • Professional Assistance: When in doubt or if problems persist, don’t hesitate to seek professional assistance from HVAC technicians or Nest support.
  • Network Optimization: Optimize your Wi-Fi network to ensure all devices, including your Nest thermostat, have a stable connection and adequate bandwidth.
  • Scheduled Maintenance: Set reminders for regular maintenance of your HVAC system and Wi-Fi network to catch and address potential issues before they become significant problems.

By following these preventive tips, you can reduce the likelihood of encountering the E73 Nest error and enjoy uninterrupted comfort in your home.


In conclusion, the E73 Nest error, indicating no power to the Wi-Fi, can be a vexing problem. However, armed with the knowledge of its common causes and the step-by-step troubleshooting procedures outlined in this article, you can regain control of your Nest thermostat and enjoy uninterrupted comfort in your home. Remember to check the power supply, Wi-Fi signal strength, compatibility, and perform a factory reset if necessary. With patience and persistence, you can conquer the E73 Nest error and ensure your thermostat operates flawlessly once more.


What is the E73 Nest error, and why is it so frustrating for Nest thermostat users?

The E73 Nest error is a connectivity issue that occurs when the thermostat can’t communicate with Wi-Fi. It’s frustrating because it disrupts your thermostat’s functionality, affecting your home’s comfort.

How can I determine if the E73 Nest error is affecting my thermostat?

You’ll see an E73 error message on your Nest thermostat display, indicating a problem with Wi-Fi connectivity.

What are the most common causes of the E73 error?

Common causes include power supply interruptions, Wi-Fi network problems, compatibility issues, software glitches, and faulty wiring.

How can I fix the E73 Nest error caused by power supply issues?

Check your circuit breaker and fuse, ensuring they are functional and your thermostat’s power cable is securely connected.