FIXED: Why is my Nest Thermostat Not Turning On Heat?

A well-functioning thermostat is the unsung hero of your home’s comfort, ensuring that your living space stays cozy during the chilly months. 

However, there are moments when you might find yourself in a rather uncomfortable situation – your nest thermostat not turning on heat when you need it the most. 

Before you start reaching for extra blankets or fiddling with the thermostat in frustration, take a deep breath. You’ve landed on the Troubleshooting Guide that will help you unravel the mysteries behind this issue.

In this comprehensive guide, we’ll dive into the common culprits behind your Nest Thermostat’s heat hiccup and provide you with clear, step-by-step instructions to diagnose and resolve these issues. 

So, let’s embark on this troubleshooting journey together. Say goodbye to shivers and hello to a comfortably warm home with our Troubleshooting Guide for your Nest Thermostat. Let’s get started!

15 Common Reasons Why Nest Thermostat Not Turning On Heat

Your Nest Thermostat is designed to keep your home’s temperature just the way you like it. However, there are several common reasons why it might refuse to turn on the heat when you expect it to. 

Understanding these reasons is the first step in troubleshooting the issue effectively. In this section, we’ll explore these common culprits:

1. Incorrect Settings

One of the most common reasons for a Nest thermostat not turning on heat is incorrect settings. Check the thermostat’s temperature settings and mode. 

Make sure it’s set to the heating mode and that the target temperature is higher than the current room temperature.

2. Wi-Fi Connectivity Issues

Nest thermostats rely on a stable Wi-Fi connection to function correctly. 

If your thermostat loses its connection to the internet or your home network, it may not be able to receive commands or updates. 

Ensure that your Wi-Fi network is working correctly and that the thermostat is connected.

3. Power Problems

Nest thermostats are powered by your home’s HVAC system. If there’s a power issue, it may not be able to turn on the heat. 

Check your circuit breaker to see if the HVAC system has tripped. Also, inspect the wires connected to the thermostat to ensure they’re properly connected.

4. Firmware Updates

Sometimes, Nest thermostats require firmware updates to work optimally. Check the Nest app for any available updates. 

Keeping your thermostat’s firmware up-to-date can resolve compatibility issues and improve performance.

5. Low Battery

If you have a Nest thermostat that uses batteries, a low battery can prevent it from functioning correctly. 

Replace the batteries and see if that resolves the issue. If you have a wired Nest thermostat, this won’t apply.

6. Sensor Obstructions

The Nest thermostat relies on internal sensors to measure temperature and occupancy. Ensure that there are no obstructions or debris blocking these sensors. 

Cleaning the thermostat and its surroundings can sometimes solve the problem.

7. Compatibility Issues

If you’ve recently upgraded your HVAC system, it’s possible that your Nest thermostat may not be compatible with the new equipment. 

Check the Nest website for compatibility information, and if needed, consider consulting a professional HVAC technician for assistance.

8. Thermostat Location

The placement of your Nest thermostat can affect its performance. Make sure it’s installed in a location where it can accurately sense the room temperature and occupancy. 

Avoid placing it near drafty windows or heat sources.

9. Schedule or Programming Errors

Check if you have set up a schedule or programming that conflicts with your current heating needs. 

Incorrect scheduling can prevent your thermostat from turning on the heat when you expect it to.

10. Temperature Lock

Some Nest thermostats have a temperature lock feature that allows you to lock the temperature to prevent unauthorized changes. 

Ensure that the temperature lock is not activated, as this can prevent adjustments to the heating settings.

11. External Factors

Extreme weather conditions, such as extremely low temperatures, can affect the performance of your HVAC system. 

If it’s exceptionally cold outside, your heating system may struggle to reach the desired temperature, and this can delay the heat from turning on.

12. Sensor Calibration

Over time, the internal temperature sensors in your Nest thermostat may require calibration. 

You can perform a manual sensor calibration through the thermostat settings to ensure it accurately detects room temperature.

13. HVAC System Issues

Sometimes, the problem might not be with the thermostat itself but with your heating system. A malfunctioning furnace, heat pump, or boiler can prevent the thermostat from turning on the heat. 

In such cases, it’s advisable to have your HVAC system inspected and serviced by a professional.

14. Power Outages

Power outages or voltage fluctuations can disrupt the functioning of your Nest thermostat. 

If there has been a recent power interruption, you might need to restart your thermostat and check its settings.

15. App or Software Glitches

If you control your Nest thermostat through a mobile app or web interface, occasional software glitches or bugs can occur. 

Try restarting the app, clearing its cache, or reinstalling it if you suspect a software issue.

DIY Troubleshooting Steps for Nest thermostat not heating

When your nest not turning on heat, it can be frustrating. However, there are several do-it-yourself (DIY) troubleshooting steps you can take before seeking professional help. 

1. Check Temperature Settings

   – Ensure your thermostat is set to “Heat” mode. To do this, open the Nest app or access the thermostat’s menu and select “Heat.”

2. Verify Target Temperature

   – Make sure the target temperature is set higher than the current room temperature. If the target temperature is lower, the thermostat won’t activate the heating system.

3. Wi-Fi Connectivity

   – Confirm that your thermostat is connected to your Wi-Fi network. A stable internet connection is essential for proper Nest thermostat functionality.

4. Power Source

   – If your Nest thermostat is battery-powered, check if the batteries need replacement. Wired models rely on your HVAC system for power, so ensure the HVAC system has power and is functioning correctly.

5. Firmware Updates

   – Check for any available firmware updates in the Nest app. Keeping your thermostat’s firmware up-to-date can resolve compatibility issues.

6. Sensor Check

   – Ensure there are no obstructions or dirt covering the thermostat’s sensors, which can affect temperature and occupancy detection. Clean the thermostat and its surroundings if necessary.

7. Check for Schedule Conflicts

   – Review your thermostat’s schedule settings. Verify that there are no conflicts or unexpected overrides preventing heating at your desired times.

8. Temperature Lock

   – Make sure the temperature lock feature is not enabled. If it’s active, you won’t be able to adjust the temperature settings.

9. External Factors

   – Consider external factors like extreme weather conditions that might affect your HVAC system’s performance. In very cold weather, it may take longer for the heat to turn on.

10. Sensor Calibration

    – If your Nest thermostat supports sensor calibration, consider calibrating the internal temperature sensors to improve accuracy.

11. HVAC System Inspection

    – If all else fails, it’s possible that the issue lies with your heating system. Have a professional HVAC technician inspect and service your HVAC system if needed.

12. Power Outages

    – If you’ve experienced a power outage, restart your thermostat and ensure that the settings are intact.

13. App or Software Issues

    – If you control your thermostat through an app, try restarting the app, clearing its cache, or reinstalling it if you suspect software issues.

Advanced Troubleshooting for Nest Not Turning On Heat

If you’ve gone through the DIY troubleshooting steps and your Nest Thermostat still isn’t turning on the heat, it’s time to dig deeper. 

1. Diagnosing Sensor Problems

Your Nest Thermostat relies on sensors to accurately measure the temperature and control the heating system. Sensor issues can lead to temperature discrepancies. Let’s investigate further:

– Explain how sensor problems can affect temperature control.

– Offer tips on identifying sensor-related issues, such as inaccurate temperature readings.

– Provide guidance on cleaning or calibrating sensors if necessary.

2. Compatibility Issues

Nest Thermostats are designed to work with a variety of heating and cooling systems. However, compatibility issues can arise, especially if you have an older HVAC system or a unique setup:

– Explain how compatibility issues can impact your Nest Thermostat’s ability to control the heat.

– Provide guidance on checking compatibility and potential solutions, such as professional installation or system upgrades.

3. Firmware and Software Diagnostics

Sometimes, persistent issues may be related to more complex firmware or software problems. Let’s delve into strategies for diagnosing and addressing these issues:

– Discuss the importance of up-to-date firmware and software.

– Provide instructions on how to perform advanced diagnostics, such as checking error logs or contacting Nest support for assistance.

4 Additional Tips for Maintaining Nest Thermostat

1. Share Your Experience

If you’ve successfully resolved your Nest Thermostat heat issue using this guide, consider sharing your experience in the comments section. 

Your insights could help others facing similar challenges.

2. Stay Informed

Keep an eye on Nest’s official website and support resources for any updates, firmware releases, or additional troubleshooting tips. 

Knowledge is power when it comes to thermostat maintenance.

3. Explore More

If you’re interested in learning more about home automation, energy efficiency, or smart thermostat features, check out our related articles and guides.

4. Professional Assistance

If the issue persists or if you encounter difficulties beyond your expertise, don’t hesitate to contact Nest support using the provided contact information in Section 4.

Frequently Asked Questions (FAQs)

Can I schedule temperature changes with my Nest thermostat?

Yes, Nest thermostats allow you to create custom schedules. You can set specific temperatures for different times of the day to match your preferences and save energy when you’re away.

How do I lock and unlock the temperature settings on my Nest thermostat?

To lock or unlock the temperature settings, go to your thermostat’s menu or use the Nest app. Locate the temperature lock feature, and follow the prompts to enable or disable it.

What should I do if my Nest thermostat’s screen is unresponsive?

If the touchscreen on your Nest thermostat isn’t responding, try cleaning it gently with a soft, dry cloth. If that doesn’t work, consider restarting the thermostat or contacting Nest support.

Can I integrate my Nest thermostat with other smart home devices?

Yes, Nest thermostats can be integrated with various smart home ecosystems, including Google Home, Amazon Alexa, and Apple HomeKit. This allows you to control your thermostat through voice commands and automation.


In the quest for a warm and cozy home, you’ve navigated through our Troubleshooting Guide, equipped with insights and steps to tackle the perplexing issue of your Nest Thermostat not turning on the heat. 

Your determination to resolve this challenge is commendable, and we hope you’ve found this guide helpful.

Remember that a warm home contributes to your comfort and well-being. We’re here to help you on your journey to thermostat troubleshooting success. 

We wish you a cozy and enjoyable living space, with your Nest Thermostat working flawlessly to keep you warm. Stay toasty!

Scott Maupin