Honeywell Thermostat Won’t Cool – Fixing Guide Here!

Check if thermostat is set to cool mode and temperature is lower than room temp. Ensure air filter is clean.

Struggling with a Honeywell thermostat that won’t cool your home? Your comfort is vital, and a malfunctioning thermostat can be frustrating. Understanding the possible reasons behind this issue can help you troubleshoot and resolve it quickly.

In this blog post, we will explore common causes for a Honeywell thermostat not cooling properly and provide you with practical solutions to get your cooling system back on track.

By following these steps, you can ensure your home stays comfortable and cool, especially during the hot summer months. Let’s dive in and troubleshoot your Honeywell thermostat cooling issue together.

Common Reasons Your Honeywell Thermostat Won’t Cool

If your Honeywell thermostat isn’t cooling your home or office, there can be several reasons behind it. Some of the common reasons for the malfunctioning of your thermostat are incorrect settings, power issues, and faulty wiring or installation. Let’s discuss each of these reasons in detail.

Incorrect Settings

The first thing you should check when your Honeywell thermostat isn’t cooling is if the settings are correct. Make sure that the thermostat is set to “cool” and that the temperature is set lower than the current room temperature. Also, ensure that the fan is set to “auto” instead of “on.”

If your thermostat has a programmable feature, double-check the settings for the cooling mode to ensure that it is set to the desired temperature throughout the day. Make sure the thermostat is not in the “hold” mode, as this can prevent your thermostat from cooling.

Power Issues

If your Honeywell thermostat isn’t cooling, the problem may be related to power issues. Check if the thermostat is receiving power by looking for the display on the thermostat. If there is no display, check the batteries, and replace them if necessary.

If the batteries are not the issue, check the circuit breaker or fuse box to see if any fuses have blown or circuits have tripped. If you find any issues, replace the fuses and reset the circuit breaker.

Faulty Wiring Or Installation

If the settings and power issues are not the problem, the issue may be related to the wiring or installation of your Honeywell thermostat. Check the wiring and make sure that it is connected correctly. If you find any loose wires, tighten them, and ensure that they are connected to the right terminal.

If you are unsure how to check the wiring, contact a professional electrician or HVAC technician to help you with the installation.

In conclusion, if your Honeywell thermostat isn’t cooling, check the settings, power, and wiring to diagnose the problem. If you are unsure about any of these issues, it is always best to contact a professional to help you with the installation and repair of your thermostat.

Initial Troubleshooting Steps

Initial troubleshooting steps for a Honeywell thermostat that won’t cool can help diagnose and resolve the issue. Follow these steps to identify and potentially fix the problem.

Checking The Thermostat Settings

Ensure thermostat settings are correctly configured for cooling. Verify that the thermostat mode is set to cool and the temperature is set lower than the current room temperature.

Resetting The Thermostat

Perform a thermostat reset to potentially resolve any glitches. This can often be done by removing the thermostat from its base for a few minutes and then reattaching it. Follow the specific reset instructions in the user manual.

Ensuring Power Supply Integrity

Check the power supply to the thermostat to ensure it is intact. Inspect for any loose connections or tripped breakers in the electrical panel. Verify that the thermostat display is powered and functioning properly.

Deeper Dive Into Thermostat Issues

Delve into troubleshooting a Honeywell thermostat not cooling efficiently. Explore common issues and practical solutions for optimal performance.

If your Honeywell thermostat won’t cool, there could be several underlying issues. Let’s take a closer look at some common problems that may be causing your thermostat to malfunction.

Battery Replacement Tips

If your Honeywell thermostat won’t cool, the first thing to check is the batteries. Replace the batteries with new ones, ensuring they are inserted correctly. A low battery can cause the thermostat to malfunction, leading to cooling issues.

Signs Of Faulty Wiring

Check for any signs of faulty wiring such as frayed or exposed wires. Faulty wiring can disrupt the communication between the thermostat and the HVAC system, resulting in cooling problems. If you notice any issues with the wiring, it’s crucial to seek professional assistance to rectify the problem.

Sensor Malfunctions

A malfunctioning sensor can also lead to cooling issues with your Honeywell thermostat. Ensure that the sensor is clean and free from any obstructions. Dust and debris can interfere with the sensor’s accuracy, causing the thermostat to inaccurately detect the temperature in your home.

Regular cleaning and maintenance of the sensor can help prevent cooling problems. By addressing these potential issues, you can troubleshoot and resolve problems with your Honeywell thermostat that may be preventing it from cooling effectively.

Advanced Fixes And Adjustments

When your Honeywell thermostat won’t cool, there are advanced fixes and adjustments that can help address the issue. Here are some steps you can take to troubleshoot and resolve the problem.

Calibrating The Thermostat

If you suspect that the thermostat is not accurately reading the temperature, you can calibrate it to ensure it is functioning correctly. Follow these steps to calibrate your Honeywell thermostat:

  1. Access the thermostat settings menu.
  2. Select the calibration option.
  3. Follow the on-screen prompts to adjust the temperature reading as needed.

Updating Thermostat Firmware

Updating the firmware of your thermostat can address software-related issues that may be impacting its cooling functionality. Here’s how you can update the thermostat firmware:

  1. Check for firmware updates on the Honeywell website.
  2. Download the latest firmware version if available.
  3. Follow the instructions provided to install the firmware update on your thermostat.

Replacing The Thermostat

If the advanced fixes and adjustments do not resolve the cooling issue, it may be necessary to replace the thermostat. Consider the following steps when replacing your Honeywell thermostat:

  1. Turn off the power to the HVAC system.
  2. Remove the existing thermostat from the wall.
  3. Install the new thermostat following the manufacturer’s instructions.
  4. Turn the power back on and program the new thermostat as needed.

When To Call A Professional

If your Honeywell thermostat won’t cool, it’s time to call a professional HVAC technician. Attempting DIY fixes can worsen the issue. A skilled technician will diagnose and resolve the problem efficiently.

When to Call a Professional Complex Electrical Issues If your Honeywell thermostat won’t cool and you suspect complex electrical issues, it’s time to seek professional help. Professional electricians have the expertise to diagnose and address intricate wiring problems that may be hindering your thermostat’s cooling function.

Recurring Cooling Problems Persistent cooling issues may indicate underlying problems that require the attention of a professional HVAC technician. These experts can conduct thorough diagnostic assessments to identify and resolve recurring cooling problems, ensuring your thermostat operates efficiently.

Upgrading Your HVAC System Considering upgrading your HVAC system can be a daunting task. Professionals are equipped to offer insightful recommendations and installation services to ensure your new system functions optimally. Seeking professional assistance is crucial for a successful upgrade that meets your cooling needs.

Remember, when your Honeywell thermostat refuses to cool, calling a professional is often the most effective solution.

Maintenance Tips To Prevent Future Issues

`regular Cleaning And Dusting`

`routine Battery Checks`

`seasonal Hvac Inspections`

User Experiences And Solutions

When dealing with a Honeywell thermostat that won’t cool, users often encounter common errors and seek successful DIY fixes or professional services. Understanding these user experiences and solutions can help address the issue effectively.

Common User Errors

Users often face several common errors when their Honeywell thermostat fails to cool their space. These errors may include:

  • Incorrect temperature settings
  • Power supply issues
  • Improper installation
  • Dirty or blocked air filters

Successful Diy Fixes

Fortunately, many users have found success in resolving the cooling issue with DIY fixes. Some effective solutions include:

  1. Checking and adjusting temperature settings
  2. Inspecting and rectifying power supply problems
  3. Re-evaluating the installation for any errors
  4. Cleaning or replacing dirty and blocked air filters

Recommended Professional Services

In some cases, users may need to seek professional assistance to address the cooling problem with their Honeywell thermostat. Recommended professional services may include:

  • Professional HVAC inspection and repair
  • Thorough system diagnosis and troubleshooting
  • Replacement of faulty components or parts
  • Upgrading to a more efficient thermostat model

Choosing The Right Honeywell Thermostat For Your Home

Selecting the appropriate Honeywell thermostat model for your home is crucial, especially if you’re facing cooling issues. Ensure compatibility with your HVAC system to efficiently address the problem and enjoy a comfortable indoor environment all year round.

When it comes to selecting the perfect thermostat for your home, Honeywell offers a wide range of models to choose from. However, with so many options available, it can be overwhelming to decide which one is the best for your needs. In this article, we will discuss some essential features to consider and provide installation tips to help you choose the right Honeywell thermostat for your home.

Comparing Models

Before selecting a Honeywell thermostat, it is crucial to compare different models to determine which one will suit your home’s needs. Here are some of the top Honeywell thermostat models:

Model Features
Honeywell T9 Smart Thermostat, Wi-Fi Connectivity, Voice Control, Room Sensors
Honeywell Home T5 Smart Thermostat, Wi-Fi Connectivity, Voice Control, Geofencing
Honeywell Home T6 Smart Thermostat, Wi-Fi Connectivity, Voice Control, Geofencing, Touchscreen Display

Features To Consider

When choosing a Honeywell thermostat, several features should be considered, including:

  • Compatibility: Ensure that the thermostat is compatible with your HVAC system.
  • Energy Efficiency: Look for thermostats with energy-saving features such as programmable settings and geofencing.
  • User-Friendliness: Consider the thermostat’s ease of use and accessibility.
  • Connectivity: Look for thermostats with Wi-Fi connectivity and voice control options.
  • Design: Consider the thermostat’s design and how well it blends with your home’s aesthetics.

Installation Tips

Installing a Honeywell thermostat is relatively easy; however, it is essential to follow the manufacturer’s instructions carefully. Here are some installation tips:

  1. Turn off the Power: Turn off the power to your HVAC system before installation.
  2. Remove the Old Thermostat: Remove the old thermostat and carefully label the wires before disconnecting them.
  3. Mount the New Thermostat: Mount the new thermostat and connect the wires according to the manufacturer’s instructions.
  4. Turn on the Power: Turn on the power and test the thermostat to ensure that it is working correctly.

By following these tips, you can ensure that your Honeywell thermostat is installed correctly and is functioning correctly to keep your home comfortable.

Frequently Asked Questions

How To Fix Honeywell Thermostat Not Cooling?

To fix a Honeywell thermostat not cooling, check settings, replace batteries, clean vents, and ensure proper installation.

Why Is My Honeywell Thermostat Not Kicking On The AC?

Check the thermostat settings and replace the batteries. Ensure the AC is on and set to cool. Confirm the circuit breaker is not tripped. Consider calling a professional if issues persist.

Why Is My Thermostat Running But Not Cooling?

A thermostat not cooling may be due to dirty filters, low refrigerant levels, or a faulty compressor. Regular maintenance can help prevent these issues.

Why Will My Honeywell Thermostat Not Switch To Cool?

If your Honeywell thermostat is not switching to cool, check if the cooling mode is enabled. Ensure the temperature setting is below the current room temperature. Verify that the system switch is set to cool, and the fan switch is set to auto or on.

If the issue persists, contact a professional technician for assistance.


Troubleshooting a Honeywell thermostat that won’t cool requires patience and attention to detail. Check settings, power source, and thermostat placement to resolve the issue efficiently. Regular maintenance and professional assistance can ensure the optimal performance of your cooling system. Stay proactive and enjoy a comfortable home environment.

Scott Maupin