Honeywell Ac Thermostat Cool On Blinking

Honeywell AC Thermostat Cool On Blinking: Troubleshooting Solutions

The Honeywell AC thermostat is displaying a blinking “Cool On” indicator. In this situation, it is important to troubleshoot the issue to identify the cause and find a solution.

A blinking “Cool On” indicator on a Honeywell AC thermostat can indicate various problems, such as a wiring issue, a faulty temperature sensor, or a malfunctioning thermostat. By troubleshooting the problem step by step, you can determine the precise cause and take the appropriate action to resolve it.

Reasons For The Cool On Blinking Indicator

The Honeywell AC thermostat Cool On blinking indicator could be due to faulty wiring connections. These connections may cause improper communication between the thermostat and the cooling system. Another reason could be incorrect temperature settings, where the thermostat is not set to the desired cooling temperature.

This can result in the system continuously running, leading to the blinking indicator. Power supply issues can also trigger this problem. Insufficient power supply to the thermostat may cause it to malfunction and display the blinking Cool On indicator. To resolve these issues, it is recommended to check the wiring connections, adjust the temperature settings, and ensure there are no power supply problems.

Honeywell AC Thermostat Cool On Blinking: Troubleshooting Solutions


Check The Wiring Connection

To troubleshoot the issue of a Honeywell AC thermostat cool on blinking, start by checking the wiring connection. Inspect the thermostat wiring to ensure that there are no loose or disconnected wires. Reconnect any wires that appear to be loose or disconnected.

Properly connecting the wiring can often resolve blinking cool on issues with the Honeywell AC thermostat. Double-check all the connections to ensure a secure and stable connection. Properly securing the wiring can help maintain a consistent cooling functionality without any blinking signals.

Ensure that all the wires are securely connected and that there are no loose connections. By inspecting and reconnecting the thermostat wiring, you can resolve the issue of the cool on blinking on the Honeywell AC thermostat.

Adjust The Temperature Settings

Adjust the temperature settings of your Honeywell AC thermostat if you notice the “cool on” light blinking. First, verify the set temperature to ensure it is in line with your desired cooling level. If the set temperature is higher than expected, make necessary adjustments by lowering it to achieve the desired coolness.

On the other hand, if the set temperature is already low, there might be an issue with the thermostat itself. In such cases, consider resetting the thermostat or contacting a professional for further assistance. It is important to maintain the optimal temperature to ensure the comfort and efficiency of your cooling system.

So, don’t overlook the blinking “cool on” light and take appropriate action to keep your home cool and comfortable.

Verify Power Supply

To troubleshoot a Honeywell AC thermostat with a blinking cool on LED, start by verifying the power supply. Check the thermostat power source to ensure proper voltage supply. Inspect the power connections and make sure they are secure. If the wires are loose or damaged, tighten or replace them accordingly.

Additionally, examine the circuit breaker panel to ensure the breaker for the AC system is not tripped. If it is, simply reset it and see if the blinking cool on issue is resolved. Moreover, check if the thermostat display is functioning properly.

A blank or dim display might indicate a power issue. If all else fails, consult a professional technician to diagnose and fix the problem. Don’t let a blinking cool on LED disrupt your comfort; taking these steps can help restore your AC’s performance.

Resetting The Thermostat

Resetting the thermostat is a simple process that can resolve the issue of a blinking cool on Honeywell AC thermostats. Accessing the reset function is the first step. To do this, locate the thermostat’s reset button, which is typically found either on the side or the back of the device.

Once you’ve located the reset button, use a small pointed object such as a pen or a paperclip to press and hold it for about five seconds. After releasing the button, the thermostat will reset and go back to its default settings.

This should stop the cool on blinking issue and allow you to use your thermostat normally again. Remember to check your owner’s manual or Honeywell’s support website for specific instructions related to your thermostat model.

Updating Firmware

Updating the firmware of your Honeywell AC thermostat is crucial for optimal performance. Firmware updates improve the functionality and address any bugs or issues that may arise. Just like any other electronic device, your thermostat requires periodic updates to ensure it operates efficiently.

To update the firmware, follow these steps carefully. Start by accessing the thermostat’s settings menu, usually located on the main screen or in the device’s menu options. Look for the firmware update tab and select it. If an update is available, click on the update button and wait for the process to complete.

It is important not to interrupt the update process to avoid any potential damage to the thermostat. Once the update is finished, the thermostat will restart automatically. Remember, regularly updating your thermostat’s firmware is essential for optimal functioning and a comfortable home environment.

Contacting Honeywell Customer Support

Reaching out to Honeywell customer support can be the first step in resolving issues with your AC thermostat. When facing a blinking “cool on” light, contacting the support team is crucial. Before reaching out, gather the necessary information for efficient assistance.

Be ready to provide details like the model number, purchase date, and any error codes displayed. This will help the customer support representative understand your situation and offer appropriate guidance. With the right information in hand, you can expect a smoother and quicker troubleshooting process.

Remember to keep your sentences concise and to the point to maintain clarity and captivate the reader’s attention. So, don’t hesitate to contact Honeywell customer support for the assistance you need.

Frequently Asked Questions On Honeywell Ac Thermostat Cool On Blinking

Why Is My Honeywell Cool On Button Flashing?

The Honeywell cool on button flashes to indicate a possible issue with the cooling system.

Why Is The Cool Light Blinking On My Ac?

The cool light on your AC blinks to indicate that it is in operation and working properly.

Why Does My Honeywell Thermostat Say Cool On But No Air?

The Honeywell thermostat may display “cool on but no air” if there is an issue with the air conditioning.

Why Is My Ac In Delay Mode?

The AC may be in delay mode due to issues with the thermostat, compressor, or circuit breaker.


The Honeywell AC thermostat cool on blinking issue can be a frustrating problem to deal with, but with the right troubleshooting steps, it can be resolved. Start by checking the power source, ensuring that it is properly connected and functioning.

Next, check the thermostat’s settings and make any necessary adjustments. If the issue persists, it may be a sign of a more serious problem, such as a malfunctioning thermostat or a wiring issue. In such cases, it is best to seek professional help to accurately diagnose and fix the problem.

Remember, regular maintenance and cleaning of the thermostat can help prevent future issues. By following these steps and staying proactive, you can ensure that your Honeywell AC thermostat operates smoothly and efficiently, keeping your home cool and comfortable throughout the summer months.

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