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Honeywell Thermostat Blinking Cool On? Check Out These Troubleshooting Tips

Note: This post may contain affiliate links. This means that at no cost to you, we may receive a small commission for made purchases.

How often do you hear from customers who say their Honeywell thermostats are blinking “cool” or “off”? If you’re having trouble with your Honeywell thermostat, don’t worry – you’re not alone.

Honeywell has been around since 1884, and they’ve been innovating ever since. The company was founded by Charles F. Brush, who wanted to create a reliable heating system that would save energy.

Today, Honeywell makes smart home devices, such as thermostats, smoke detectors, doorbells, and security systems.

When you install a new Honeywell thermostat (see also ‘Battery Replacement In Honeywell Thermostatsis’) in your home, it should automatically connect to your Wi-Fi network. If it doesn’t, follow these steps to fix the problem.

If you have an older Honeywell thermostat that isn’t connected to the Internet, you can still use it for basic temperature control.

Honeywell Thermostat Blinking Cool On?

However, if you want to set up more advanced features like scheduling, programming, or remote access, you need to upgrade to a newer model.

The first step is to check whether your thermostat is working properly. You can test this by turning the dial of the thermostat to the desired setting (e.g., 65 °F) and then pressing the Test button.

If the display shows the correct temperature, then there’s no issue.

Next, make sure the thermostat is plugged into a power outlet. If it’s not plugged in, it won’t be able to communicate with your Wi-Fi network, which means you won’t be connected to the Internet.

Finally, try restarting your router. This will ensure that all devices attached to it are reconnected.

If none of those solutions work, contact Honeywell customer service at 1-800-944-6610.

What Does It Mean When The Thermostat Blinks Cool On?

Cooling messages indicate that your AC is working properly. If your AC is off or doesn’t work, you’ll see this message. If you see this message for a long period of time without feeling cold air, then your AC is probably malfunctioning. Your compressor may lose power or stop working.

First, check if there is anything blocking the vent. You might be able to see it if you open the window or door. If you can’t see it, try opening the windows and doors to let fresh air flow in.

If this doesn’t work, turn off the power to the unit and wait 10-15 minutes before turning it back on again.

You should try these troubleshooting steps if your Honeywell thermostat (see also ‘How To Connect A Honeywell Thermostat To Wi-Fi: All Models‘) is having trouble cooling down. First, check the fuse box to make sure the fuses aren’t blown.

Next, try turning off the power to the unit. After that, turn the temperature up or down, and then turn the power back on. If none of these work, call a professional who can help fix the problem.

A cool indicator means that the air conditioner has been activated. The temperature inside the house should be lowered.

Smart thermostats can save money by automatically turning off heating and cooling systems during times when you’re not home. You can also set them to turn on and off based on occupancy.

How To Fix A Thermostat That Blinks Cool Or Off

If you’re getting a flashing light on your thermostat, it could mean that something is wrong with your thermostat. There are several reasons why your thermostat might blink cool or off:

Your thermostat may be malfunctioning. If your thermostat is blinking cool or off, it could be because of a faulty sensor.

Your thermostat may be too old. Older thermostats were designed to only send one signal when the air conditioner or heater is turned on or off. Newer models can handle multiple signals.

Your thermostatic controls may be misaligned. If your thermostats aren’t aligned correctly, you may get a false reading. To align them correctly, turn the knobs until the indicator lights up green.

You may have an incompatible thermostat. If you bought a new thermostat but it didn’t work right, you may need to replace it. Contact Honeywell customer support to find out what kind of thermostat you have.

If you’ve tried everything else and nothing works, you may need to call a professional to repair your thermostat.

How To Control Your Honeywell Thermostat Remotely

If you have a Honeywell thermostat, you probably already know how to program it manually. But did you know that you can also remotely control your thermostat from anywhere?

With the help of a smartphone app, you can adjust the temperature settings and even schedule automatic adjustments based on time and date.

To start using your thermostat remotely, download the Honeywell Home App on iOS or Android. Then open the app and log in with your existing login information.

To change the temperature, tap the Settings icon in the upper left corner of the screen. Tap the Temperature tab, and select the desired temperature.

Tap Schedule, and choose between Scheduled and Manual Adjustments. For manual adjustments, enter the time and date you want the adjustment to occur.

Tap Save Changes. The next time you turn on your thermostat or visit the app, you should see the changes.

How To Program Your Honeywell Thermostats Using The Web Interface

If you prefer to program your thermostat from the comfort of your computer, you don’t need any special software. All you need is a web browser like Chrome, Safari, or Firefox.

Log in to your Honeywell account. Click My Account, then click Manage Account.

Click Devices & Controls, and then click Add Device. Select the device type (thermostat) and model number. You can also add other devices if you wish.

Click Next Step. Enter your Honeywell user ID and password, and then click Continue.

Select the device you just added, and then click Edit Settings. In the General section, you can set the name for this device.

In the programming section, you can use the following options:

  • Temperature Setpoint – This setting allows you to set the desired temperature for the room.
  • Fan Speed – This option lets you adjust the fan speed.
  • Fan Mode – Choose whether you want the fan to operate continuously or only when needed.
  • Programming Modes – These settings let you choose which modes are available for programming.
  • Set Timers – This option lets you create schedules for adjusting the temperature
  • Schedule Type – You can choose between Scheduled and Automatic Adjustment.

For more details about each setting, hover over the text.

When you’re done configuring your thermostat, click Save.

Troubleshooting Steps To Checking Your Honeywell Thermostat

Troubleshooting Steps To Checking Your Honeywell Thermostat

The first thing we need to do is check if our computer is cooling at all. We can do this by turning down the temperature to the lowest setting and checking that the fan is set to auto. Wait about an hour after doing these things before proceeding to the next step.

A Honeywell thermostat could be switched to the wrong setting. When there was an outage recently, the thermostat might have been switched to the setup mode. Make sure to check the time on your thermostat and fix any problems.

Your thermostat needs healthy battery life to work correctly. If the batteries are dead, the thermostat may be flashing the “Cool On” message. You need to replace the batteries before you run out of power.

Check the batteries in your thermostat. Head over to your indoor and outdoor units to make sure they are powered up. Also check connections, sockets, and power supplies and make sure everything is hooked up correctly.

Listen for any unusual sounds. It may be an indication of a system problem. Switching the power on and off may help. Check the circuit breaker.

A dirty or clogged air filter can result in a number of system issues. Furthermore, they can also drive up energy bills and decrease the longevity of your AC unit.

As a general rule of thumb, change your air filter every three months. However, you may need to change this more often if you have pets or allergies.

Dirty air conditioner coils can restrict airflow and cause a Honeywell thermostat to blink cool on. Cleaning out the coil will help restore proper airflow and prevent the thermostat from blinking cool.

Resetting your thermostat doesn’t always work. You should be careful when doing this because if you don’t know what you’re doing, you could damage the unit or even cause a fire. If you want to save your settings, you need to write them down first.

Call an HVAC technician if your thermostat isn’t working properly.

1. The thermostat is able to adjust the temperature by controlling the airflow. Adjust the controller settings to see what happens when the thermostat calls for cooling.

Set the mode to cool, and make sure the fan setting is set auto. Let the thermostat do its job for a while and see what happens.

2. Your thermostat was switched to set up mode. You should check the time setting on your thermostat.

3. If the batteries are low, the thermostat won’t work. You’ll need to replace them. Your thermostat might run off of AC instead of batteries, so you’ll need to check the wiring.

Some thermostats require screws to be removed before checking the wires. You need to change your Honeywell thermostat battery.

4. The first step is to check if the equipment is functioning properly. Sounds should be heard when the unit is powered up. The power supply should be checked. The door should close properly. There shouldn’t be any loose or unscrewed pieces.

All the cables should be connected properly. Also, make sure there isn’t anything blocking the equipment. Check the circuit breakers for any unusual activity. Turn on and off your equipment. Also, check the circuit breakers. Blow fuses with a voltmeter.

5. Check the indoor filter and if your AC unit is still working fine, but you need to change the filter. You should do this every 3 months. If you don’t clean your filter regularly, it could block up and cause your AC to run slower.

Also, your AC may freeze up or stop working due to a clogged filter.

6. Dirty or blocked external AC coils prevent proper airflow to them. Cleaning them regularly helps to improve the efficiency of the system. Try to give it enough space around it to have better airflow. Also, try to avoid placing it near any other element (like plants or leaves).

7. After isolating possible problems from the rest of the house, you should reset your thermostat to the factory defaults. This will wipe any configuration information from your thermostat. Write down what you set up before you reset your thermostat.

Resetting your thermostat does not change anything about it. You need to adjust it manually if you want to change how it works.

8. Don’t forget your manual! It could have info about your concern. Some of those may be specific to your thermos model. The vague prompts your thermostat displays aren’t always helpful. But check your manual for explanations on common hitches.

Lost your manual? You’ll likely find it somewhere online. We also have a useful list with most Honeywell Thermostats’ manuals. There’s a search function, and to easily identify yours, you can also check the images included.

9. A professional can come to your house and check out your air conditioning system. He/she will check the wires, the compressor, the fan motors, and more. You should call them if your system isn’t working right now.

How To Use The Honeywell Home App To Control Your Thermostat Remotely From Anywhere

The Honeywell Home App makes it easy to control your thermostat remotely. To get started, download the app on your iPhone or iPad. Open the app and sign in to your existing Honeywell account.

Once logged in, you’ll be able to access all your current settings, as well as view and modify them.

You can also view and edit your scheduled programs. Simply tap the Schedules button at the bottom right of the screen.

You can also set up recurring programs. Just tap the Recurring Programs button, and choose the frequency and duration of the program.

To adjust the temperature, tap the Temperature tab at the top of the screen. You can either manually adjust the temperature or schedule an automatic adjustment based on the weather conditions.

To learn how to do both, read our guide here.

How To Change The Time Zone On Your Honeywell Thermostat

Your thermostat uses the local time zone to determine what time it thinks it is. If you live somewhere that doesn’t have daylight savings time, you may find that some days the thermostat displays the wrong time.

Fortunately, changing the time zone on your thermostat is simple. Follow these steps:

  1. Log in to your Honeywell home account by visiting
  2. Go to the Devices & Controls page.
  3. Click the thermostat you’d like to change the time zone for.
  4. On the next page, select the time zone you’d like to use.
  5. Click OK.
  6. The thermostat will update its internal clock with the new time zone information.
  7. When you log back in, you’ll see the correct time displayed on your thermostat.
  8. 8. Repeat Steps 1 through 7 to change any other thermostats in your house.
  9. If you don’t want to use a specific time zone, simply leave the box blank.
  10. Click Update Settings.
  11. Click Save Changes.
  12. Close the app.

Final Thoughts

If you’re having trouble controlling your thermostat, try one of these solutions first. If they don’t work, then we’ve got a few more ideas for you.

Check your wiring. If possible, remove the cover from your thermostat and look inside. Is there anything loose or damaged? Do you notice any strange smells? If so, contact a professional immediately.

Make sure the batteries are fully charged. Most thermostats require two AA alkaline batteries. The batteries must be fresh and fully charged.

Reset the thermostat. This is usually done when the thermostat malfunctions. Resetting your thermostat resets the programming and allows it to start over.

We hope that this article has provided you with the means to solve the issue at hand!

author avatar
Anthony Barnes
Anthony Barnes is the founder of Water Heater Hub and a second-generation plumber by profession. Before developing Water Heater Hub, Anthony Barnes was a full-time plumber, and he has undertaken a wide variety of projects over the decades. As a second-generation plumber, it was easy for Anthony to get used to the technicalities of all from a tender age


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