Cool blinking on thermostat

Step 1: Identify the Issue. The first step in fixing a flashing snowflake on your thermostat is determining the cause. This will help you address the specific problem effectively. Common causes include low battery power, incorrect thermostat settings, sensor or wiring issues, or a system malfunction.

LED bulbs can be expensive up-front, but they more than make up their cost in energy savings over their lifespan (which can be measured in decades). Today at Best Buy though, you c...First things first—you should always check the batteries in your thermostat if it’s not turning on your AC. Pull off your thermostat from the wall and check if it has a battery compartment behind it. Change out the batteries, reinstall the thermostat, and check if your AC works. Not all thermostats have batteries—but it’s a good thing ...Is the “Cool On” message solid (not blinking) on the thermostat display? Verify your thermostat’s wiring. Check that the wires are connected securely to the terminals. Remember, the color of the wires only relates to the terminals they are connecting. Reference: The Y terminal on your thermostat controls the primary (1st stage) cooling.Verify that the thermostat is switched to cool mode and has a cooling set point below the room temperature reading. Check the thermostat display for cooling, …Feb 22, 2022 · Check the circuit breaker to your equipment. Confirm the thermostat is set to Cool mode and the setpoint (the smaller number at the top of the thermostat display), is set to a temperature lower than the display temp (the larger number in the center of the display). Confirm the message "Cool On" is solid (not flashing) on the thermostat display. On a Honeywell thermostat, a message that says ‘temporary’ indicates that the device is on a temporary hold. During this period, the thermostat will keep the temperature in your house at a certain setting. Once the temporary hold expires, the device will get back to its normal schedule. You get to decide when the temporary hold should …Aug 29, 2022 · Why is my thermostat display showing “wait,” “waiting for equipment,” or flashing “cool on”? Each thermostat model has a different display message when a delay occurs. This delay can be up to five minutes under normal operating conditions. An improperly installed thermostat can result in various issues, including a blinking cool indicator without the cooling system functioning. Troubleshooting Steps. When your Honeywell thermostat is blinking cool on but not working, it can be frustrating. However, you can take several troubleshooting steps to try and resolve the issue.

The fix. If your thermostat is flashing cool on, wait for 5 minutes until the delay is over. Usually the thermostat delay should not take more than 5 minutes. However, if your thermostat is not blowing cold air after the delay period, there could be issues causing this problem. Let’s go to the next step to find out more.After resolving any wiring issues, you can reinstall the thermostat display and restore power. Then, when the device reconnects to the HVAC system, you can try adjusting the temperatures manually and see if the flashing icon goes away (after 5-10 minutes of course). Step 7. Bypass the Thermostat Wires.Why Is Honeywell Ac Blinking Cool On? The Honeywell AC blinks cool on because it indicates that the cooling mode is activated. Why Is My Thermostat Blinking Cool And On? The thermostat blinks cool and on because there may be a problem with the cooling system. Conclusion. To sum up, if you find your Honeywell thermostat blinking “Cool On ...heating or cooling system control board to test the thermostat installa- tion. This could damage the thermostat and void the warranty. • Do not select the COOL mode of operation if the outside temperature is below 50º F (10º C). This could possibly damage the controlled cool- ing system and may cause personal injury.A flashing snowflake icon on an Emerson thermostat may be a normal occurrence or may indicate a problem with your HVAC system. If your Emerson thermostat flashes a snowflake icon, the HVAC system has gone into a time delay mode. This time delay mode is usually caused by short cycling in the system. Airflow problems, faulty …Step 1 – Set to Thermostat’s Lowest Temperature Setting. When troubleshooting your thermostat’s “cool on,” the best way to start is by setting the temperature at the lowest setting. Check to see whether the thermostat can control the temperature, and if not, try modifying the controller settings.Thermostat Blinking Cool On, But No Air. If the COOL ON message is still flashing even after 5 minutes have passed, then you can try troubleshooting the thermostat. Set the thermostat to the lowest possible temperature. Double-check the thermostat settings – a power outage might have forced your device to switch back to set-up mode. …

When the “Cool On” or “Heat On” indicator continues to flash for more than five minutes without hot/cold air coming in, it can indicate an issue with the HVAC system. If so, I recommend following the troubleshooting steps laid out below. 1. Wait 5-10 minutes.November 19, 2022. When you see the “Cool on” light on your Honeywell thermostat blinks you perhaps don’t know whether it is “normal” or not. Probably you are used to …When troubleshooting a Honeywell thermostat blinking cool on but not working issue, it is essential to check the thermostat settings. Start by adjusting the temperature settings to ensure they are accurately reflecting your desired comfort level. Additionally, examine the mode settings to verify that the system is set to cool mode. ...An improperly installed thermostat can result in various issues, including a blinking cool indicator without the cooling system functioning. Troubleshooting Steps. When your Honeywell thermostat is blinking cool on but not working, it can be frustrating. However, you can take several troubleshooting steps to try and resolve the issue.Jun 28, 2018 · Check the Battery. If your the screen on your thermostat is blinking, it may just mean that the battery is low, and this is simply your unit’s way of telling you to replace its batteries before it dies entirely. If this is the case, unscrew the thermostat from your wall and replace its batteries. If the unit continues to blink, you may have a ... To fix a blinking snowflake, start by checking the thermostat settings. Ensure that the temperature and mode are correctly set. If the snowflake icon keeps blinking, it may be due to the temperature being set too low or the thermostat being in cooling mode. Adjust the settings accordingly to see if this resolves the issue.

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The thermostat automatically activates the auxiliary heating when the desired temperature is not met by the heat pump system alone. After either five, ten, or twenty minutes of your thermostat not reaching the set temperature, your thermostat automatically activates the auxiliary heat. Some thermostats can be set manually, although many come ...Normally when the “cool on” light starts flashing on your Honeywell thermostat, it’s nothing to worry about. This usually means that the air conditioning unit is starting to get to work. If you leave it for a couple of minutes, the light should switch off when the AC starts to work properly.In today’s fast-paced world, it’s important to keep an eye on your home even when you’re not there. That’s where the Blink Home Monitor App comes in. One of the standout features o...The fan seems to be working, but no air comes from the vents and the fan outside for the outside is not spinning like the downstairs one is. HVAC Technician: gotoman for ac. It is probably getting late but check breaker on unit and also check float switch located on inside unit. It is set to open up and trip if drain backs up.In summary, when faced with the Honeywell Pro Series Cool On Blinking issue, it is essential to check the power source, perform a thermostat reset, and adjust the fan settings. By following these possible , you can troubleshoot and resolve the blinking light problem, restoring the proper functionality of your Honeywell Pro Series thermostat.Check other thermostat settings – something might have made your thermostat switch back to setup mode. Also, check the time on the device, as wrong settings can make the ‘cool on’ indicator start blinking. Replace the batteries or check the wiring (if your device is not battery-operated). If none of these steps make a difference, then you ...

Why Is Honeywell Ac Blinking Cool On? The Honeywell AC blinks cool on because it indicates that the cooling mode is activated. Why Is My Thermostat Blinking Cool And On? The thermostat blinks cool and on because there may be a problem with the cooling system. Conclusion. To sum up, if you find your Honeywell thermostat blinking “Cool On ...When your thermostat says “cool on” but there’s no air, it could be due to issues with your HVAC system like a tripped circuit breaker, a clogged filter, or a refrigerant leak. First, check your thermostat settings, ensuring it’s in “cool mode” and set to the correct temperature. If the settings are right, try resetting your ...Conclusion – Honeywell Thermostat Cool On Blinking. In most cases, a blinking “Cool On” indicator on a Honeywell thermostat simply means that there is a delay, and the system will start working normally after about 5-10 minutes. If the problem persists, try bypassing the thermostat or troubleshooting the system further.Apr 10, 2023 · The Braeburn thermostat ‘cool’ flashing typically occurs when the thermostat is calling for cooling or when the time off delay is activated. Other times when the outdoor unit is not working or is not properly connected, it can also cause your thermostat to flash ‘cool’. But generally when your braeburn thermostat is flashing cool, there ... If you have a heat pump, set it to “heat” rather than “cool” or “automatic.” If the system has not been switched off, proceed to step 3. Step 3 – Check the thermostat settings. Two important settings on your thermostat can prohibit the thermostat to turn on the heat if any one of them is set incorrectly. Temperature settingsThe Honeywell thermostat is a trusted climate control device, but it may display a confusing “Cool On” flashing message. This can stem from various factors, including settings, cooling system problems, or thermostat issues.Check if the thermostat is set to “Heat” mode and if the “Heat On” button is blinking. This means that a safety timer for your thermostat’s compressor has been tripped. Once this stops the heat blinking, your thermostat should be able to maintain its heat setting again. The 4-5 minute blinking is the time delay.However, if your Honeywell thermostat has been blinking for more than 5 minutes and you still cannot feel any cooling, resetting the thermostat can fix the issue. In this article, I discuss the different steps you can take to resolve the issues with ‘Cool On’ on your Honeywell thermostat and explain the different problems that may have ...Check that all vents in your home are open and unobstructed. Move any objects that may be blocking the vents, such as furniture or curtains. After cleaning or replacing the filters and ensuring vents are open, turn your thermostat back on and set it to “cool.”. Wait a few moments to see if the air begins blowing.To reset the reminder: 600 Family Models - hold the Program and Time button down for 3 seconds. 700 Family Models will have a column of buttons on the left side of your thermostat – hold the second button from the top down for 3 seconds. 801 Model will have 2 buttons behind the door – hold down the one on the left (Fan Button) for 3 seconds.If your Honeywell thermostat is set to cool, but not working, the most likely cause is a problem with the wiring or power supply. Check that all wires are connected securely and that you have sufficient power (a working battery if it uses one). If everything appears normal, then you may need to reset the thermostat by pressing and holding …Normally when the “cool on” light starts flashing on your Honeywell thermostat, it’s nothing to worry about. This usually means that the air conditioning unit is starting to get to work. If you leave it for a couple of …

My LUXPRO Thermostat (psd1111) will not stay on the desired cooling setting of 70 t0 72 degrees. It wants to jump up to 77 or 78. When I run it back down to 70 it goes back to 77 or 78 again in a few …

A blinking “Cool On” message can indicate various causes, such as dying batteries, a power surge, or a power outage. Thermostat batteries generally last for an average of …Aug 28, 2023 · 1. Wait For 10 Minutes. Before you decide to fix the Honeywell thermostat cool-on flashing error, you must wait for about 5 to 10 minutes. As there is a good chance that your thermostat is going through a restart or running some checks. Or it might be facing a slight delay or using the compressor protection feature. Check if the thermostat is set to “Heat” mode and if the “Heat On” button is blinking. This means that a safety timer for your thermostat’s compressor has been tripped. Once this stops the heat blinking, your thermostat should be able to maintain its heat setting again. The 4-5 minute blinking is the time delay.When the “Cool On” or “Heat On” indicator continues to flash for more than five minutes without hot/cold air coming in, it can indicate an issue with the HVAC system. If so, I recommend following the troubleshooting steps laid out below. 1. Wait 5-10 minutes.An improperly installed thermostat can result in various issues, including a blinking cool indicator without the cooling system functioning. Troubleshooting Steps. When your Honeywell thermostat is blinking cool on but not working, it can be frustrating. However, you can take several troubleshooting steps to try and resolve the issue.Following are the steps to troubleshoot a flashing ‘Cool on’ indicator. Change the temperature to the lowest possible. The first thing you should do is to make …Last updated. 8/29/22. Why is my thermostat display showing “wait,” “waiting for equipment,” or flashing “cool on”? Each thermostat model has a different display …Aug 28, 2023 · 1. Wait For 10 Minutes. Before you decide to fix the Honeywell thermostat cool-on flashing error, you must wait for about 5 to 10 minutes. As there is a good chance that your thermostat is going through a restart or running some checks. Or it might be facing a slight delay or using the compressor protection feature. Feb 11, 2023 · 3. Cooling system requires service or thermostat requires replacement. Same procedure as diagnostic for No Heat condition except set the thermostat to COOL and lower the setpoint below the room temperature. There may be up to a five minute delay before the thermostat clicks in Cooling. Heat, Cool or Fan Runs Constantly. 1. Possible short in wiring.

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The fix. If your thermostat is flashing cool on, wait for 5 minutes until the delay is over. Usually the thermostat delay should not take more than 5 minutes. However, if your thermostat is not blowing cold air after the delay period, there could be issues causing this problem. Let’s go to the next step to find out more.Check the Battery. If your the screen on your thermostat is blinking, it may just mean that the battery is low, and this is simply your unit’s way of telling you to replace its batteries before it dies entirely. If this is the case, unscrew the thermostat from your wall and replace its batteries. If the unit continues to blink, you may have a ...flashing. Cool mode: When the room temperature rises above the set point by the number of degrees of the differential, the cooling will turn on and the icon will display. The cool will run until the cool setting is reached, cooling will turn off and Cool icon flashing Temporary Time Delay Override: 1- Select system mode (HEAT or COOL) 2- Press ...The status LED will be flashing red: Braeburn 3300 Thermostat Troubleshooting. Issue How to Fix; Thermostat does not turn on heating or cooling system: 1. Check if OFF is in display. This indicates that the system is turned off at the thermostat. Change the system to HEAT or COOL. ... The thermostat must be in HEAT or COOL modes of operation to ...Amazon held an event this morning, and wow-oh-wow did they announce a lot. Smart thermostats! Flying security cameras! Robot companions! Didn’t tune in or have time to catch it all...1.7K. 134K views 1 year ago #thermostat #HVAC #acnotcooling. Is you house HVAC thermostat blinking "cool on" or "heat on" and does not turn on the furnace or …The “cool on” blinking indicator on a Honeywell thermostat is primarily a sign that the thermostat is in a delay mode. It is designed to protect your HVAC system by …Thermostat Blinking Cool On, But No Air. If the COOL ON message is still flashing even after 5 minutes have passed, then you can try troubleshooting the thermostat. Set the thermostat to the lowest possible temperature. Double-check the thermostat settings – a power outage might have forced your device to switch back to set-up mode. …2/22/22. If your thermostat is newly installed and the heat pump worked for cooling with the previous thermostat, check the following: 1. Verify that the thermostat is set to cool and is calling for cooling, usually indicated by the words "cool on," a snowflake icon, or a shimmering snowflake icon. If the room temperature is below the cool set ...A blackout or power outage can also make the thermostat shift to the setup mode, which causes the blinking of the ‘Cool on’ indicator. Also, check whether the thermostat is not set or off because that causes this indicator’s blinking. If yes, review and configure the settings according to the instructions. Check the batteries ….

To reset the thermostat, you have to turn off the thermostat with the power button for five to ten minutes. During this time, the settings will be erased. On the other hand, if turning off the power button doesn’t work, we recommend that you disconnect it with the help of the main power cable. 4. Low Airflow.Blinking Cool on Due To Delay Mode. Sometimes, you’ll see a blinking Cool On snowflake icon. It is not worrisome as your thermostat is only in delay mode to prevent short cycling. This mode usually lasts for about five minutes and then the thermostat stops blinking. If you see a blinking Cool On snowflake icon, lower the …The reason why Honeywell thermostat blinking cool on is maybe the thermostat devices taking delay time to prevent the AC from short cycling. However, the cool on flashing may indicate that the AC is pumping cool …In this video, we will walk you through troubleshooting a Honeywell thermostat with a blinking "Cool On" message. If you're having issues with your thermosta...If you have a Honeywell T5 thermostat, then you may have noticed that it appears to be flashing or blinking cool. This is actually quite common and can indicate a few different issues. First of all, the thermostat might need batteries replaced, as its low battery warning system will cause the screen to flash ‘cool’ when the power supply is ...If the batteries are dying, your thermostat could be blinking the “Cool On” message. When your thermostat doesn’t have enough power, it won’t be able to start …Sensi Touch 2 smart thermostat: Make sure the room temperature number is not blue. Sensi Lite smart thermostat: Make sure the word “ON” is not displayed. Switch the thermostat back to Cool Mode. Lower the set point a few degrees above the room temperature. Within a few seconds, the thermostat should make a soft clicking sound …Turn on the power to the system and the thermostat by flipping the circuit breaker or the disconnect switch to the ON position. Check the thermostat and the system and see if they work properly. Make sure the thermostat is set to the correct mode and temperature and the system is not flashing heat on anymore.If you have a heat pump, set it to “heat” rather than “cool” or “automatic.” If the system has not been switched off, proceed to step 3. Step 3 – Check the thermostat settings. Two important settings on your thermostat can prohibit the thermostat to turn on the heat if any one of them is set incorrectly. Temperature settingsIf your thermostat is blinking “Cool On”, it means that your air conditioning unit is working to pump cool air into your home. However, if the message continues to … Cool blinking on thermostat, Feb 21, 2024 · 10 DIY Ways to Fix Honeywell Thermostat Cool On Blinking. Here are 10 common troubleshooting tips to stop your Honeywell thermostat from blinking Cool On: 1. Wait 10 Minutes; As mentioned if the blinking Cool On goes away after 5-10 minutes, the system likely just needed time to start up and begin cooling your home. , Use a common wire system. 4. Inspect the wiring. 5. Factory reset. 6. Adjust the temperature. An important fact about the Google Nest thermostat is that the temperature doesn’t need to be manually adjusted. This smart thermostat remembers your preferences and desired temperatures for a particular period of the day., A blinking snowflake on a White Rodgers thermostat typically means that the thermostat is in the “cool” mode and the ‘delay mode’ feature is active. This feature is designed to protect the compressor from starting too frequently, which can cause damage and reduce its lifespan. Under normal circumstance, delay mode doesn’t take more ..., If your Honeywell thermostat is set to cool, but not working, the most likely cause is a problem with the wiring or power supply. Check that all wires are connected securely and that you have sufficient power (a working battery if it uses one). If everything appears normal, then you may need to reset the thermostat by pressing and holding …, Last updated. 2/22/22. The temporary hold setting is when you change the temperature setting to a different temperature and it stays at that setting until the next schedule change. The permanent hold setting holds the temperature setting you have chosen for an indefinite time. This overrides your scheduled settings., The blinking “Cool On” message on a Honeywell thermostat display indicates that the system is restarting, batteries need replacing in the control panel, or a …, Honeywell thermostat says "cool on" blinking or "heat on" flashing, but not working after changing batteries. Thermostat blinks Cool On or Heat On is a safet..., A thermostat blinking “cool on” can be caused by various factors, such as electrical surges, dying batteries, or incorrect settings. It is essential to identify the root cause of the issue to resolve it effectively. Firstly, ensure that the thermostat is in “cool mode” and has the air vent set to “auto mode.” If the issue persists ..., Sensi Touch 2 smart thermostat: Make sure the room temperature number is not blue. Sensi Lite smart thermostat: Make sure the word “ON” is not displayed. Switch the thermostat back to Cool Mode. Lower the set point a few degrees above the room temperature. Within a few seconds, the thermostat should make a soft clicking sound …, Check wiring. Check fuse. Replace with 3 amp fuse if fuse has opened. Thermostat turns on and off too frequently. Increase temperature differential. Display is blank, flashing or constant LO BAT. Replace batteries. System fan does not operate properly. Move fan option switch to either gas or electric, to match system., 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 …, A blinking “cool” light on a thermostat usually indicates that the air conditioning system is not functioning properly. There can be various reasons for this issue, such as a faulty thermostat, a tripped circuit breaker, low refrigerant levels, a clogged air filter, or a malfunctioning compressor., In this video, we will walk you through troubleshooting a Honeywell thermostat with a blinking "Cool On" message. If you're having issues with your thermosta..., Honeywell Thermostats: A blinking snowflake or the word “heat/cool” blinking on a Honeywell thermostat indicates Delay Mode. The system should resume operation after 5 minutes. Emerson Thermostats: Emerson’s thermostat enters lockout mode, preventing the compressor or heat element from cycling too quickly., 10 DIY Ways to Fix Honeywell Thermostat Cool On Blinking. Here are 10 common troubleshooting tips to stop your Honeywell thermostat from blinking Cool On: 1. Wait 10 Minutes; As mentioned if the blinking Cool On goes away after 5-10 minutes, the system likely just needed time to start up and begin cooling your home., Cool = 78°F Leave Heat = 62°F 8:00 AM 8:00 AM Cool = 85°F Return Heat = 70°F 5:00 PM 5:00 PM Cool = 78°F Sleep Heat = 62°F 10:00 PM 10:00 PM Cool = 82°F FAN OPERATION The thermostat has two settings for fan operation, AUTO and ON. PROGRAMMING YOUR THERMOSTAT – MODELS 8363, 8365 & 8366 SET …, Jul 21, 2023 · System Switch not set toHeat or cool. Set system to cool or heat an either raise or lower set point below room temperature. Loose connection tothermostat or system. Ensure wires are securely attached. Malfunctioning thermostat. Replace thermostat. Dirty filter. Replace air filter. Thermostat needs a reset. , The fan seems to be working, but no air comes from the vents and the fan outside for the outside is not spinning like the downstairs one is. HVAC Technician: gotoman for ac. It is probably getting late but check breaker on unit and also check float switch located on inside unit. It is set to open up and trip if drain backs up., A blinking “Cool On” message can indicate various causes, such as dying batteries, a power surge, or a power outage. Thermostat batteries generally last for an average of 10 months, making it easy to identify when dead batteries are responsible for the blinking message. However, sometimes a Honeywell thermostat can recuperate after a power ..., Turn off the Thermostat: Locate the thermostat’s power switch or circuit breaker in your electrical panel. Turn off the power to the thermostat. Wait for a Few Minutes: Leave it off for about five minutes to allow any residual power to dissipate.; Turn the Thermostat Back On: Restore power to the thermostat by flipping the switch or circuit breaker back on., Thermostat Blinking Cool On, But No Air. If the COOL ON message is still flashing even after 5 minutes have passed, then you can try troubleshooting the thermostat. Set the thermostat to the lowest possible temperature. Double-check the thermostat settings – a power outage might have forced your device to switch back to set-up mode. Choose ..., 1. Wait For 10 Minutes. Before you decide to fix the Honeywell thermostat cool-on flashing error, you must wait for about 5 to 10 minutes. As there is a good chance that your thermostat is going through a restart or running some checks. Or it might be facing a slight delay or using the compressor protection feature., May 5, 2022 · Thermostat Blinking Cool On, But No Air. If the COOL ON message is still flashing even after 5 minutes have passed, then you can try troubleshooting the thermostat. Set the thermostat to the lowest possible temperature. Double-check the thermostat settings – a power outage might have forced your device to switch back to set-up mode. Choose ... , 3. The display is stuck- if this happens, the usual source for the problem is a mistake in the configuring process. When you see the display is stuck, you have to reset the thermostat. To do that, you just need to remove the power supply, wait a few minutes and then reconnect the power and re-configure the device., The blinking "Cool On" means the cool cycle is in delay (5 minute by default). If it's continually blinking then either the thermostat is bad, or there's a short in the low voltage wiring that's causing it to reset everytime it tries to come back on (basically resetting itself over and over). 2. Reply. Effective-Brush9301., Honeywell Thermostat cool on blinking will be fixed by 1.Lowering thermostat setting,.2.check if the clock set or is the thermostat in..., A blackout or power outage can also make the thermostat shift to the setup mode, which causes the blinking of the ‘Cool on’ indicator. Also, check whether the thermostat is not set or off because that causes this indicator’s blinking. If yes, review and configure the settings according to the instructions. Check the batteries, 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 …, A blinking snowflake on a Honeywell thermostat is mostly caused by activated delay mode or an activated saver switch (if you are subscribed to one). This issue can be fixed by simply waiting for the delay time to elapse which is typically about 5 minutes or switching the saver switch off, respectively. Also read: Honeywell thermostat blinking ..., The Thermostat Batteries are Low and Need to be Replaced. If your thermostat screen is blinking, it may simply be a sign that the batteries are low and need to be replaced. When your thermostat’s batteries eventually die, you will be presented with a blank display screen — and unable to cool or heat your home., Amazon held an event this morning, and wow-oh-wow did they announce a lot. Smart thermostats! Flying security cameras! Robot companions! Didn’t tune in or have time to catch it all..., Dec 20, 2023 · Check other thermostat settings – something might have made your thermostat switch back to setup mode. Also, check the time on the device, as wrong settings can make the ‘cool on’ indicator start blinking. Replace the batteries or check the wiring (if your device is not battery-operated). If none of these steps make a difference, then you ... , – A faulty thermostat not sending the correct signals. – A malfunctioning compressor that cannot cool the air efficiently. Identifying and addressing these issues can help resolve the blinking ‘Cool on’ problem. Conclusion. To troubleshoot the issue of the Honeywell AC thermostat cool on blinking, you can follow these steps.