Honeywell cool on flashing thermostat

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 ...

A thermostat with low batteries might have trouble commanding the AC to turn on and off. The AC unit might also not respond to changes you make to the thermostat’s settings. In addition, low batteries can trigger the flashing “cool on” message. Most thermostats will notify you if their batteries are starting to run out.Oct 4, 2023 · 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. Oct 18, 2023 · 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. 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.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.Troubleshoot Honeywell Thermostat Flashing Cool On or Heat On with our clear and concise guide and restore your HVAC system.Final Thoughts. 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 air into your home. The blinking is supposed to go away within 5 minutes.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.

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 …As of 2015, Honeywell manufactures more than 60 thermostat models ranging from seven-day digital programmable thermostats to manual thermostats, and all models can be viewed on the...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.How to lock Honeywell 6000 thermostat. Go to “Up” and “Down” buttons to the right of the LCD display on your Honeywell thermostat. Tap “Up” and “Down” until you get to the desired temperature on the display. Press the button beneath “Hold” on the LCD display. “Permanent Hold” will appear on the screen. Your thermostat is ...In some cases, the “Cool On” message may flash for only a short time, and if it stops after 5 minutes and the cool air is restored, ... Understanding the cause of the Honeywell thermostat cool on blinking issue and following the appropriate troubleshooting steps can help you resolve the problem and bring comfort back to your home.Jul 12, 2021 · 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.’.

Clean The Unit. This may seem like an unlikely and unnecessary solution, but it is not very uncommon either. If the inner components or the thermostat gets dirty or clogged for some reason, it can malfunction and the green light can have issues. So you can try cleaning up the unit properly.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: 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.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 …Confirm the message "Cool On" is solid (not blinking) on the thermostat display. Confirm your wiring is correct, and the wires have good contact in the terminals (tug gently on the wires) Check your jumper / R wire. Thermostats get power on the R and Rc terminals.If you have a wire in the R terminal, and no wire in the RC terminal, use the ...Jul 12, 2021 · 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.’.

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Replacing an old Honeywell thermostat usually involves changing to a newer model or to an energy-efficient programmable digital thermostat. This process is straightforward and can ...show the flashing battery icon until buttons are pressed. If the batteries are not changed 43 days after the thermostat detects low battery voltage, the thermostat screen will only show the flashing battery icon until buttons are pressed and the set points will offset to 85°F/29°C in cooling and 55°F/13°C in heating.We would like to show you a description here but the site won’t allow us.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.Web connected thermostats are great, but they're expensive. If you want to make your own, blogger and engineer Nooganeer shows how to build one using a Raspberry Pi and an old iPho...Why is My Honeywell T5 Thermostat Cool on Blinking? If you have a Honeywell T5 thermostat, then you may have noticed that it appears to be flashing or …

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.Set FAN switch to choose whether the fan runs continuously or only as needed. Set the FAN switch to Auto or On. In “Auto” mode (the most commonly used setting), the fan runs only when the heat-ing or cooling system is on. If set to “On,” the fan runs continuously. About Temperature your new controls thermostat.If you see a cool on blinking on your thermostat it means that there is fault in the thermostat wiring or the battery is dying. The Cool On message also appears on screen when AC gives a 5 minutes cooldown time to the compressor or if blower motor is not working properly. A dirty Air Filter can also be the reason for cool on blinking on …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.Are you experiencing the Honeywell thermostat cool on blinking problem? If so, you’re not alone. This is a common air conditioning issue. While this problem can be …It probably means that the compressor is not turning on. Here's how to fix that: 1. Verify that the set point is below the indoor temperature. 2. Verify the "snow flake" icon is shimmering - which may take 5 minutes or longer due to compressor protection. 3. Click here (link to another article) to make sure the Thermostat Configuration is correct.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.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.Read online Honeywell Thermostat HZ221 User Manual pdf with better navigation. Printable and downloadable Honeywell Thermostat HZ221 user guide pdf. Model:HZ221 Page: 8. Download (PDF, Unknown) Model:HZ432 Page: 16. Download (PDF, Unknown) Note: For opening this Honeywell Thermostat HZ221 Manual, your computer need …

Jun 25, 2023 · 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.

q Single Stage Heat and Cool q Heat Only or Cool Only Congratulations, you’re done! If your system type is: q Heat pump q High efficiency furnace q Hot water q Electric furnace q Gas/oil steam q Gravity system Continue with Advanced Installation to match your thermostat to your system type. This thermostat works on 24 volt or 750 mV systems.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 SettingThermostat RTH2300/RTH221 keeps flashing return on display screen, ac not working. ... I purchased a RTH2300/RTh221 Honeywell thermostat, and have not been able to install it properly. ... Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics. Rick. HVAC Supervisor. 15,847 satisfied customers.A thermostat can flash “cool on” without blowing air due to electrical surges and dying batteries. 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 ...If the system is set on cool, make sure the temperature is set below the temperature in the room for the air conditioner to turn on. If all of the above factors check out and the thermostat still is not functioning, look for a flashing icon on the display. If you see one, that means the thermostat is currently in delay mode and should work ...If your Honeywell thermostat is blinking the “cool on” indicator but not actually cooling your home, it’s important to verify the functionality of your HVAC system. The fourth step in troubleshooting is to check the circuit breaker or fuse box.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 ...How to Fix Honeywell Thermostat Cool On Blinking Light. 1. Lower Thermostat Temperature. 2. Check Thermostat Batteries. 3. Inspect Electrical Wiring. …

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When engaged, the thermostat screen displays “Waiting for Equipment,” or on older models, you may see “Wait,” a flashing “Cool On,” or “Heat On” message. This feature can help minimize short cycling but only when the system is recovering from a power outage or when the temperature is adjusted manually or via the schedule.A drying battery causes poor performance in thermostat devices and can even cause cool on flashing on thermostat. So it’s important to check this power source in your thermostat or replace the Honeywell thermostat battery.You can easily open the battery compartment and look manually.Fix Honeywell thermostat flashing cool on by turning it down to lowest temperature. Check the mode & the air filter, examine AC coils or reset your thermostat.Oct 15, 2022 · Honeywell Thermostat Flashing Cool On After Changing Batteries Depending on usage, the batteries in your Honeywell thermostat can last for 8-24 months. If your thermostat model does not have a low-battery indicator, then the device will use the ‘cool on’ message to tell you that the batteries are going to die soon. 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 …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 …How to set Honeywell thermostat to cool. Answer: If you wish to make your house cooler, you must manually adjust the Honeywell thermostat’s temperature. To turn the fan on or off, press the “Fan” button. Then, to place the thermostat in Heat, Cool, or Off mode, hit the “System” button. Push the button one more to alter the setting.Last updated. 2/22/22. The thermostat has a built-in 5 minute delay to protect your equipment. If “wait” is in the screen or “cool on” is flashing – wait 5 minutes for the …Honeywell TH8321WF1001 Troubleshooting involves diagnosing and resolving any issues with the thermostat. ... The Honeywell TH8321WF1001 thermostat is a versatile device that allows you to control your HVAC system efficiently. ... Double-check the thermostat settings to ensure that the mode (cool, heat, or auto) and the desired …It probably means that the compressor is not turning on. Here's how to fix that: 1. Verify that the set point is below the indoor temperature. 2. Verify the "snow flake" icon is shimmering - which may take 5 minutes or longer due to compressor protection. 3. Click here (link to another article) to make sure the Thermostat Configuration is correct.Electronic Thermostats. An electronic thermostat runs on an automatic switch, turning your AC on and off at certain temperatures. Common issues include: 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 … ….

To troubleshoot a Braeburn thermostat that’s not cooling; Check if it’s set to cool mode and if the system is in delay. Verify that the furnace power switch or circuit breakers are not off or tripped. Inspect the thermostat wiring for loose wires or broken connections. Ensure that the thermostat is configured for the correct system type.Nov 3, 2023 · The battery of the thermostat is low. When the cool light on your Honeywell thermostat keeps flashing, it may mean that the batteries are running low. The new thermostat has separate lights that show when the battery is low, but the old one still shows when the battery is low by flashing a message. On average, thermostat batteries last for 10 ... Feb 16, 2023 · Once it is complete, it will stop the blinking. Also, see if the thermostat is set to clock and working correctly. 3. REPLACEMENT OF LOW BATTERIES: Honeywell Thermostat not cooling functions for almost two months before showing the low battery indicator. Low batteries can be one of the causes your thermostat ‘cool on’ keeps blinking. Confirm the message "Cool On" is solid (not blinking) on the thermostat display. Confirm your wiring is correct, and the wires have good contact in the terminals (tug gently on the wires) Check your jumper / R wire. Thermostats get power on the R and Rc terminals.If you have a wire in the R terminal, and no wire in the RC terminal, use the ...When the “Cool on” light blinks on your Honeywell thermostat, it’s not necessarily a sign that there is something that needs fixing. When the light blinks only for …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.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 ...Honeywell Thermostat Flashing Cool On: Quick Fix. Reviewed By Leticia Haupt Latest Updated August 8, 2023. Your Honeywell thermostat will send you a message “cool on,” which means your AC will push some cool air into your house.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 ... Honeywell cool on flashing thermostat, Oct 4, 2023 · 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. , When a honeywell thermostat says waiting for equipment, it is an indication that the thermostat is in delay mode. Delay mode is a built-in feature on a HVAC system that works with your thermostat to prevent your compressor from starting too soon after a shut off, thereby preventing your HVAC equipment from damage. ... “Cool On” (flashing), If your Honeywell thermostat is flashing cool on, it could be due to a delay mode, a clogged air filter, a shorted contactor, or other issues. Troubleshooting steps include resetting the thermostat, checking the contactor, and cleaning or replacing the air filter. Clogged Air Filters. One of the most prevalent causes of a Honeywell thermostat ..., 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 ..., 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., CLICK LINKS BELOW FOR ITEMS IN/RELATED TO VIDEO🍒 Here's my thermostat https://amzn.to/3cMWO9X🍒 Upgrade to this one? https://amzn.to/3Sc8L9v🍒 This one al..., Oct 4, 2021 · 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 perform diagnostics. The “Cool On” indicator message on a Honeywell thermostat ... , Oct 25, 2023 · 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 ... , 1-Week Programmable Thermostat Support; 5-2 Day Programmable Thermostat Support; Single-stage Programmable Thermostat Support; Pro 2000 Horizontal Programmable Thermostat Support; T6 Pro Smart Thermostat Support; T5/T5+ Smart Thermostat Support , 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., Feb 10, 2021 · A sudden change from cool to heat, or heat to cool. Changing the batteries in your system may also cause this to happen. Honeywell thermostats are equipped with a second line of defense in addition to the delay timer. If you try to start your HVAC system before the set delay time, the thermostat will flash cool on and won’t allow you to turn ... , 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., The first thing you want to check when your honeywell thermostat is flashing a red light is look at the settings on your thermostat and ensure that you have not turned on emergency heat. On most thermostats that are connected to zone controllers or equipment monitors, when emergency heat is manually turned on, it will flash a red light …, Web connected thermostats are great, but they're expensive. If you want to make your own, blogger and engineer Nooganeer shows how to build one using a Raspberry Pi and an old iPho..., 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, …, 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 from 50 °F to 99 °F (10 °C to 37 °C), you may ..., 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., Feb 10, 2021 · A sudden change from cool to heat, or heat to cool. Changing the batteries in your system may also cause this to happen. Honeywell thermostats are equipped with a second line of defense in addition to the delay timer. If you try to start your HVAC system before the set delay time, the thermostat will flash cool on and won’t allow you to turn ... , Heat On / Cool On flashing on the screen: Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor. ... Honeywell T10 PRO Smart Thermostat Installation Guide (article) Honeywell FocusPRO 5000 Series Manual (article) Honeywell Lyric T6 Pro Wi-Fi Programmable Thermostat Manual, Oct 4, 2021 · 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 perform diagnostics. The “Cool On” indicator message on a Honeywell thermostat ... , Read online Honeywell Thermostat HZ221 User Manual pdf with better navigation. Printable and downloadable Honeywell Thermostat HZ221 user guide pdf. Model:HZ221 Page: 8. Download (PDF, Unknown) Model:HZ432 Page: 16. Download (PDF, Unknown) Note: For opening this Honeywell Thermostat HZ221 Manual, your computer need …, Aug 4, 2022 · How to set Honeywell thermostat to cool. Answer: If you wish to make your house cooler, you must manually adjust the Honeywell thermostat’s temperature. To turn the fan on or off, press the “Fan” button. Then, to place the thermostat in Heat, Cool, or Off mode, hit the “System” button. Push the button one more to alter the setting. , 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., A sudden change from cool to heat, or heat to cool. Changing the batteries in your system may also cause this to happen. Honeywell thermostats are equipped with a second line of defense in addition to the delay timer. If you try to start your HVAC system before the set delay time, the thermostat will flash cool on and won’t allow you to turn ..., 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 ..., Sep 19, 2023 · The Honeywell thermostat in your house will act as the HVAC system’s control panel. It detects the surrounding temperature and sends signals to the HVAC system to give you the desired temperature when you set it. The COOL ON indicator blinking is usual if that is only for 4-5 minutes. But more than 5 minutes is abnormal. , 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 ..., Thermostat RTH2300/RTH221 keeps flashing return on display screen, ac not working. ... I purchased a RTH2300/RTh221 Honeywell thermostat, and have not been able to install it properly. ... Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics. Rick. HVAC Supervisor. 15,847 satisfied customers., Here are the main reasons why your Honeywell thermostat is blinking “Cool On”: A power outage: A power outage or some other interruption associated with a power source can trigger the thermostat’s compressor to restart and activate the ‘Cool On’ icon to blink. Chaining the Set Temperature: Readjusting the temperature manually after ..., The most common reason for a Honeywell thermostat “cool on” blinking light is that the AC compressor needs 5 minutes to restart safely after a power interruption. This delay allows the pressure inside the AC system to equalize before the compressor turns back on, preventing damage., 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. , Are you experiencing the Honeywell thermostat cool on blinking problem? If so, you’re not alone. This is a common air conditioning issue. While this problem can be …, 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.