There might be two reasons in Honeywell thermostat’ blinking: 1.With a heat pump installation process, blinks are replaced with “flashing.”. If the thermostat is installed in this type of system, then compressor protection should be checked. To do so one must see if an “on” message appears when pressing either cool or warm buttons on ...Honeywell Thermostat Cool On Flashing Troubleshooting. Thermostats / By Emmanuel Joseph. For most people, the term “troubleshooting” sounds relatively complicated, especially when it has to do with technology. But what people do not realize is that it is not as difficult as it sounds most times.Jun 3, 2023 · Power outage or any interruptions in the power cause the thermostat to automatically switch to the setup mode. This is also one of the reasons why you find your Honeywell thermostat flashing cool on. Keep an eye on the clock and review all the settings accordingly. 3. Check Whether the Batteries Are Working. 4 Manual Troubleshooting Techniques. 4.1 Step-by-step Guide For Manual Troubleshooting Of The Honeywell Hz311 System. 4.2 Identifying And Fixing Issues With The Reversing Valve. 4.3 Switching The System To Cooling Mode And Resolving Any Related Problems. 4.4 Fixing The Bypass In The Hz311 System. 4 Manual Troubleshooting Techniques. 4.1 Step-by-step Guide For Manual Troubleshooting Of The Honeywell Hz311 System. 4.2 Identifying And Fixing Issues With The Reversing Valve. 4.3 Switching The System To Cooling Mode And Resolving Any Related Problems. 4.4 Fixing The Bypass In The Hz311 System. Verify the fan setting: Set the fan setting to “Auto.”. This ensures that the fan will turn on automatically when the cooling system is activated. Double-check the mode and time settings: Ensure that the thermostat is correctly programmed with the desired mode and time settings. Incorrect settings can cause the “Cool On” message to appear.Is you house HVAC thermostat blinking "cool on" or "heat on" and does not turn on the furnace or air conditioner? This is most often caused because power was...Hello everyone, I bought a honeywell rth6500wf so I can have a smart thermostat instead of the thermostat that came with the house. The one in currently installed is a Honeywell th411ou2005. I removed the old set up. With the green wire going to G. Yellow wire to Y. Blue wire to C. Red wire to R. White going to O/B.A: A) Yes, this unit uses the HAC-504AW filter. These filters need to be replaced every 1-3 months. One is included with the humidifier. I hope this information is helpful! Please contact us at 1-800-477-0457 or [email protected] if you require further assistance. Answered 9 years ago by ManufacturerTechSupport.The filter can improve the system’s performance or cause extensive damage when clogged with a significant amount of dirt. If the Cool On indicator flashes on your Honeywell thermostat, turn the air conditioner off and inspect the filter. A clogged air filter restricts the airflow into and out of the system, causing a malfunction.Due to drained batteries, the heating or cooling feature of thermostats malfunctions. Go to your thermostat’s display and see the battery level. Insert the batteries of the required voltage so that your thermostat performs well. Replacing the batteries can debug the Honeywell thermostat won’t switch to cool. 4.If your Honeywell thermostat says “cool on” but there’s no air blowing, there could be several reasons for the issue. It’s essential to identify the problem’s source to apply the appropriate solution. Here are some of the common causes of a thermostat not blowing air: Faulty thermostat settings. Air conditioning system problems.Some thermostats keep blinking the cool on message, but now you don’t have to worry about it. The Honeywell Pro series thermostat cool on flashing can be fixed differently. Keep trying these steps, and your Honeywell thermostat will start functioning like before and release all your stress by giving out the natural cool-on effect.Honeywell thermostat flashing “cool on”. A/C is not blowing cold air. : r/HVAC. Honeywell thermostat flashing “cool on”. A/C is not blowing cold air. Thermostat is set to 70°. It’s currently 76°. First time I’ve ever seen this. Please help! Two kids are human heaters and need the cool air when they sleep.How to Reset Honeywell Thermostat. Resetting your Honeywell thermostat is a simple and painless process. Begin by pressing the reset button on the side of the thermostat, then wait for the display to clear. Next, press and hold down both the “up” and “down” buttons until all segments of the display flash twice.WIFI SMART COLOR THERMOSTAT Manual & Support. RTH9585WF1006/W, RTH9585WF1004/U. Download Manual. WIFI SMART COLOR THERMOSTAT Product Page. Guided Installation.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.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 message when a delay occurs. This delay can be up to five minutes under normal operating conditions.Adobe Flash is one of the most popular multimedia software programs used for creating interactive content. It is widely used in web design, animation, and video games. With its pow...Aug 8, 2023 · If the flashing light on your Honeywell thermostat has been on for more than 5 minutes and there is no cooling,. In such a case, resetting the thermostat may resolve the problem. In this blog, we are going to outline the many measures you may take to address the difficulties with ‘Cool On’ on your Honeywell thermostat. Also, we will talk ... Step one: Setting the time. Start by pressing and holding down the “SET” function until the date or time flashes. After display flashes, use arrow functions to alter and set the correct time. Honeywell Thermostats are equipped with arrow buttons that are essential and handy.1. Lower Thermostat Temperature. 2. Check Thermostat Batteries. 3. Inspect Electrical Wiring. 4. Reset AC Circuit Breaker. 5. Replace AC Filter. 6. Clean AC Condenser Coils. 7. Verify Thermostat Settings. 8.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 fault with the system. If the blinking persists for more than five minutes, contact a technician to …The “Cool on” message on a Honeywell thermostat is also known as “delay mode”. It often flashes in the form of a blinking snowflake or as the word “wait’ as well. It’s a courtesy message to let you know that the AC will delay in coming on for approximately 5 minutes in order to protect your unit from short cycling which can cause ...Learn why the "Cool on," "Heat on," "Snowflake," or "Flame" is blinking on your thermostat device at the Honeywell Home Support and Resource Center.We would like to show you a description here but the site won’t allow us.The Honeywell 8000 thermostat is a popular choice for homeowners looking to upgrade their heating and cooling systems. With its sleek design and advanced features, this thermostat ...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.However, if the blinking persists, it might signal something that needs your attention. Common Reasons for Honeywell Thermostat Blinking Cool On. System Starting Up The Honeywell cool on blinking is often seen when the system is just starting up. It’s a brief pause to ensure the compressor doesn’t cycle too quickly, usually lasting no more ...2) You have a conventional heating system. Another reason a honeywell thermostat will not display the cool option is that you don’t have a cooling system such as an air conditioner or a heat pump. Be sure that you have an air conditioner. You can try setting your thermostat to defrost and check if the condenser unit will engage.Watch this video to find out how to repair leaking roof flashing around a chimney with step-by-step instructions. Expert Advice On Improving Your Home Videos Latest View All Guides...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 …Jan 11, 2024 · The blinking ‘Cool on’ message on your Honeywell AC thermostat usually indicates an issue with the cooling system. It could be due to a dirty air filter, low refrigerant levels, a faulty thermostat, or a malfunctioning compressor. 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.Jul 10, 2021 · There might be two reasons in Honeywell thermostat’ blinking: 1.With a heat pump installation process, blinks are replaced with “flashing.”. If the thermostat is installed in this type of system, then compressor protection should be checked. To do so one must see if an “on” message appears when pressing either cool or warm buttons on ... As I said in the title, it takes a long time to go to a solid "Cool On" upstairs on the Honeywell thermostat, and when it does the blower comes on. Outside the fan spins up. ... the blinking of "cool on" means the thermostat is in compressor protection mode. usually 5 min until it goes solid. it is supposed to do that if the unit has just ...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.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 message when a delay occurs. This delay can be up to five minutes under normal operating conditions.The “Cool on” message on a Honeywell thermostat is also known as “delay mode”. It often flashes in the form of a blinking snowflake or as the word “wait’ as well. It’s a courtesy message to let you know that the AC will delay in coming on for approximately 5 minutes in order to protect your unit from short cycling which can cause ...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 ...Due to drained batteries, the heating or cooling feature of thermostats malfunctions. Go to your thermostat’s display and see the battery level. Insert the batteries of the required voltage so that your thermostat performs well. Replacing the batteries can debug the Honeywell thermostat won’t switch to cool. 4.View and Download Honeywell 1-Heat/1-Cool - TH5110D1022 Large R operating instructions manual online. Non-programmable Thermostat. 1-Heat/1-Cool - TH5110D1022 Large R thermostat pdf manual download. Also for: Th5110d, Focuspro 5000, Th5100d1007/u.If the high limit switch is open due to overheating, it can cause the your Honeywell thermostat to flash “Heat On”. Troubleshooting will typically involve checking the high limit switch to ensure it is not tripped or stuck in the open position. If it is, allow the furnace to cool down and then reset the switch.The flashing "COOL" indicates 5 minute delay. After 5 minutes it should stay continuous cool and unit should come on. the system comes on but short cycles. and then the flashing "cool on" comes back on. thermostat is set to 71, temp is at 77. OK.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 ...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 running low. Alternatively, if you’ve recently changed your filter or had maintenance done on your HVAC unit, then this could also trigger the cool blink as it’s adjusting to new settings.Steps To Troubleshoot Issues With ‘Cool On’: Honeywell Thermostat. The ‘Cool On’ indicator flashing on your Honeywell thermostat should normally resolve itself within 5 minutes. However, if that does not happen, you can use the steps below to troubleshoot the issue and resolve the problem. Set Thermostat To Lowest Temperature …Honeywell Air Comfort provides expert insights and solutions to enhance your cooling experience. Explore our FAQs now regarding troubleshooting, usage, and more! ... CFM of 200, for example, is a spot cooler and can affect a radius of about 50 sq. ft. A cooler with a CFM of 2,000 can cool a space that is about 500 sq. ft. Bear in mind, though ...Compressor protection: A "cool on" or "heat on" message may appear along with a flashing light. Low batteries: Replace the batteries periodically, even if there is no "Replace bat" message . For older analog models, ensure the thermostat is mounted level on the wall and located about 5 feet from the floor.Honeywell Thermostat Cool ON Is Flashing Flashing lights on a thermostat can be extremely unsettling, especially if you are unsure what they mean. One of the most common instances of this is when you need cool air sent to your home, but you see the thermostat’s “Cool ON” or a little snowflake flashing in the corner.Return is when you get back home, and Sleep is for the sleeping period. When your thermostat reads “Return,” it means that the Return schedule is currently working. Return programming makes sure that your home is at an ambient temperature when you get back from work. It follows the Leave time period where the temperature is reduced to lower ...In a matter of minutes, the air should kick on and the snowflake will remain solid. If the blinking does not stop, the next step is to switch the dial to “off.”. Perhaps the thermostat did not properly relay to the HVAC system. By moving the switch to “off” and then back to “cool,” you can start the system up again.Do not worry. It’s a much more common problem than you might think. 90% of the time, it won’t be a huge problem. It’s just a ‘feature’ of the Honeywell Thermostat. The only time you need ...Honeywell AC thermostats have a cool-on blinking light that indicates the unit is working to cool down the room. This could be due to either an incorrectly set temperature or because of an issue with the thermostat itself. If you find your Honeywell AC thermostat’s cool on light blinking, first check and make sure that you have selected a ...Aug 4, 2022 · So, when your Honeywell thermostat is in the blinking stage, it shows Cool-On for more than 5 minutes – But there is a feeling that the surrounding area is not cooling down, there is no cool air coming through the system either; you might need to fix the problem. I just changed the option..waiting for it to come on now The "cool on" is flashing HVAC Technician: HVAC Guru , replied 6 years ago OK make sure you have the crossover valve set to the right one it is 0 or 1 depending on the wiring to the outside unit.Opening your Honeywell thermostat is a fairly simple and quick task. There are two different kinds of openings that Honeywell thermostats have. They either have a slide or swing op...Sep 29, 2021 · A “cool on” message can also appear if the thermostat logs out or times out on its own. Wait 5 minutes, restart your thermostat, and identify and replace fuse or wire damage to make it return to normal. Thermostats can also flash a “cool on” message if it is working hard to produce cool air. This can happen even if there isn’t an ... 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.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.Jul 10, 2021 · There might be two reasons in Honeywell thermostat’ blinking: 1.With a heat pump installation process, blinks are replaced with “flashing.”. If the thermostat is installed in this type of system, then compressor protection should be checked. To do so one must see if an “on” message appears when pressing either cool or warm buttons on ... How to Reset Honeywell Thermostat. Resetting your Honeywell thermostat is a simple and painless process. Begin by pressing the reset button on the side of the thermostat, then wait for the display to clear. Next, press and hold down both the “up” and “down” buttons until all segments of the display flash twice.Set some occasions, a Honeywell thermostat can may on and bad setting. In instance, if there was an recent strength outage, this can causative your thermostat to switch to the ‘Setup’ switch. Diese canister led to the dreadful Honeywell cool on flashing problem. If they notice the system is in the ‘Setup’ mode, produce the necessary change.Make sure power switch at heating & cooling system is on. Make sure furnace door is closed securely. Wait 5 minutes for the system to respond. Make sure heating and cooling temperatures are set to acceptable ranges: Heat: 40° to 90°F (4.5° to 32°C). Cool: 50° to 99°F (10° to 37°C). Compressor protection feature is engaged.In recent years, Adobe Flash Player has been the go-to software for viewing multimedia content on the web. However, with its discontinuation and the rise of more secure and efficie...Sep 15, 2023 · To set your Honeywell Thermostat to permanent hold, you need to first press the + or – button and adjust the temperature. The thermostat will display ‘temporary hold’ along with a flashing setpoint temperature. While the temperature is flashing, press the ‘hold’ button and change it to permanent hold. I was trying to take a nap on an ... When your Honeywell thermostat continuously displays “Cool On” or “Heat On” alerts without achieving the desired temperature, it unquestionably signals a malfunction. Normally these messages only flash for five minutes and then turn solid to indicate the system has started.PRO 3000 1 Heat/1 Cool Non-Programmable Digital Thermostat. SKU: TH3110D1008/U. Simple Operation. This Honeywell Home PRO 3000 Non-Programmable Thermostat from Resideo offers basic operation such as a slide switch for selecting heat, cool, or operate the fan. The backlit digital display makes temperature and settings easier to read in various ...Crank thermostat down to the lowest temperature. The first step is to determine if your system is cooling at all and if it can control it. To check this, turn down your thermostat to its coldest setting. After setting it to the minimum temp, double-check the mode is set to ‘Cool.’. Also, make sure the fan setting is set to ‘Auto.’.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.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.Try Resetting the Thermostat to Factory Settings. 1. Honeywell Lyric Y Family. You must press the reset button and wait for 5-10 seconds, later release the button. 2. Honeywell 4000/6000/8000. Press and hold the “Reset” button for 5-10 seconds. Release the “Reset” button. 3.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. ...Feb 14, 2021 · Low Batteries. A blinking “Cool On” message can appear due to dying batteries, a power surge, or a power outage. Thermostat batteries last for an average of 10 months, so it is easy to tell when dead batteries are the culprit. Sometimes, a Honeywell thermostat can bounce back after a power outage without requiring a reset. Honeywell thermostats are known for their reliability and advanced features, but sometimes navigating through the user manual can be a bit overwhelming. When you first receive your...Due to drained batteries, the heating or cooling feature of thermostats malfunctions. Go to your thermostat’s display and see the battery level. Insert the batteries of the required voltage so that your thermostat performs well. Replacing the batteries can debug the Honeywell thermostat won’t switch to cool. 4.To set the Honeywell thermostat temperature to cool, follow these steps: Switch to Cool mode by pressing the System button on the thermostat, the Mode icon on the touchscreen, the System icon on the app, or saying a voice command, such as Set the system to cool. Adjust the desired cool temperature by using the up and down arrows …Adobe Flash is one of the most popular multimedia software programs used for creating interactive content. It is widely used in web design, animation, and video games. With its pow...Find out how to properly install metal roof flashing around a chimney. Expert Advice On Improving Your Home Videos Latest View All Guides Latest View All Radio Show Latest View All... 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... Usually, a Honeywell thermostat will enter Recovery mode when it needs to adjust from a mode that is energy-saving. When this happens, it will turn on your HVAC system before the time you scheduled a certain temperature, so it will get the chance to adjust gradually. For instance, if you set up your thermostat to offer you a temperature of …
Honeywell PRO 1000 Series User Manual View and Read online. Est. reading time 4 minutes. PRO 1000 Series Thermostat manuals and instructions online. ... When "Heat On" or "Cool On" is flashing, compressor protection is engaged. Select the system setting * Model TH1110E1000 has a larger display than shown in image.. Dirty myrtle wing company
If you use a touchscreen model, press the “Menu” button to access the settings. On settings, scroll through the menu to find the “Reset” or “Factory Reset” option. Once you find it, select it. Now, your thermostat should prompt you to input your password to confirm the reset. Input your correct password now.Aug 8, 2023 · How to Reset Honeywell Thermostat. Resetting your Honeywell thermostat is a simple and painless process. Begin by pressing the reset button on the side of the thermostat, then wait for the display to clear. Next, press and hold down both the “up” and “down” buttons until all segments of the display flash twice. A blinking ‘Cool On’ thermostat might be resolved by performing a reset and reprogramming the thermostat. To do this, consult your thermostat’s manual for instructions on resetting and reprogramming. It may involve a simple restart or a complete factory reset, which would erase all previously programmed settings.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 …Check circuit breaker and reset if necessary. Make sure power switch for heating & cooling system is on. Make sure furnace door is closed securely. Wait 5 minutes for the system to respond. Temperature settings do not change. If you are in the correct mode, but you cannot set the heat from 32 °F to 90 °F (0 °C to 32 °C), or set the cool ...Solve The Honeywell Thermostat Flashing Problem. Before you start with some other method, you should wait for around 5 minutes. Sometimes “Cool On” icon on your Honeywell thermostat is displayed due to a timeout feature in A/C unit.That way your compressor is protected. The pressure difference can sometimes damage the … 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. 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.Honeywell AC Thermostat Flashing “Cool on”. Any idea why it’s doing this? I checked the wiring and they’re all in the correct ports and secure. I’m not sure what else to check. Any help is appreciated! 1 upvote · 1 comment. 1. If you see Honeywell thermostat flashing cool on, give it a time, around 15 to 20 minutes. Just turn everything off and wait. After the minute has passed, try to turn it on again. If nothing happens, contact the manufacturer’s customer service. But if the system works again, you know that you only need to give it time. II. Cool On Blinking on Honeywell AC Thermostat A. Overview of the Cool On Blinking issue. The cool on blinking issue on a Honeywell AC thermostat is one of the most common problems reported by users. When the cool on indicator light blinks, it indicates that there is an issue with the cooling system or thermostat that needs attention.Check circuit breaker and reset if necessary. Make sure power switch for heating & cooling system is on. Make sure furnace door is closed securely. Wait 5 minutes for the system to respond. Temperature settings do not change. If you are in the correct mode, but you cannot set the heat from 32 °F to 90 °F (0 °C to 32 °C), or set the cool ...The filter can improve the system’s performance or cause extensive damage when clogged with a significant amount of dirt. If the Cool On indicator flashes on your Honeywell thermostat, turn the air conditioner off and inspect the filter. A clogged air filter restricts the airflow into and out of the system, causing a malfunction.The Honeywell digital thermostat is a popular choice for homeowners looking to efficiently control the temperature in their homes. However, understanding how to properly operate an...When the cool light is blinking on your thermostat, it means that the unit is not receiving enough power to operate. This could be caused by a number of things, including a tripped circuit breaker or a faulty power cord. If you suspect that the problem is with the power supply, you should first check the circuit breaker and reset it if necessary.Sep 26, 2023 · If you return from a vacation and find your Honeywell thermostat repeatedly flashing “cool on,” there’s no need to be alarmed. This occurrence can often be attributed to a power outage during your absence. When such an interruption happens, your thermostat may revert to setup mode, leading to the persistent blinking of the “cool on ... 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.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 …Nov 16, 2023 · Easy Fixes for the “Cool On” Flashing Issue. Now that we have identified the potential causes, let’s explore seven easy fixes to resolve the “Cool On” flashing issue with your Honeywell thermostat: 1. Check Thermostat Settings: Ensure that the thermostat is set to the correct mode (cooling mode). The 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. To resolve it, check settings, ensure the cooling system is functional, and consider professional assistance if needed.During the brief wait period, the thermostat will flash Cool On (or Heat On if you have a heat pump) until the wait period is over, at which point the compressor will turn back on. Note: The flashing Cool On or Heat On message is also used for startup delay protection if AC power loss occurs. 1. Reply. Pinkskippy..