Honeywell pro series flashing cool on

Remove your thermostat from the wall, and open the battery holder on the side of your thermostat. Remove the old batteries and clean the inside of the holder. Insert the fresh set of batteries and close the battery holder. Remount the Honeywell thermostat on the wall again. Ensure that it clicks into position.

Honeywell pro series flashing cool on. Flashing cool on. Contractor's Assistant: Do you know the model of your Honeywell thermostat? How old is it? 3 years old, honeywell home pro series. Contractor's Assistant: How long has this been going on with your Honeywell thermostat? What have you tried so far? Turned off circuit breakers for ac and furnace, turned back …

In this video I explain what Temporary and Permanent Hold are on a Honeywell Pro Series Thermostat. I show you step by step how to select Temporary Hold and ...

By Mukesh Bhardwaj. -. January 11, 2024. Honeywell Pro Series Thermostat helps to regulate the amount of coolant recirculation to the machine and how much the radiator is cooling before recirculating. So, no matter what the outside temperature is, your engine's coolant remains within a specific temperature range.cool is on. +2 will appear for the second stage of heat. +3 will appear for the third stage of heat. Setpoint: Displays the user selectable setpoint temperature. Hold: is displayed when the thermostat program is permanently overridden. System Operation Indicators: If these or the Fan indicator are flashing, it means that the system is in aCheck 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.There are several possible causes for a Honeywell thermostat blinking heat on message. Some of them are easy to fix, while others may require professional assistance. Here are some of the most common ones: Time Off Delay. Power Loss to the Condenser Unit or the Air Handler. Blown Fuses. Malfunctioning Control Board. Open High Limit Switch.Honeywell 6000 series: When your device is 'ON,' press and hold the 'Fan' button followed by the 'Up' arrow button, hold these buttons for about 5 seconds before releasing. Press the button on the bottom left until the number on the display panel changes to '39'. Next, press the 'Down' arrow button until you see '0' and ...You might see your Honeywell thermostat that says that the heat is on, and yet you get no heat. This can happen for many reasons. A broken thermostat, incorrect wiring, tripped circuit breakers, blown fuses, or a broken HVAC system could cause this. Here, we describe some of these causes, and then offer troubleshooting techniques and repair ...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...2/22/22. When you are in Auto Change Over mode, the display will say either "auto heat" or "auto cool" to the left of the room temperature. If you are trying to change the heat setting when the display says "auto heat", or trying to change the cool setting when it says "auto cool", simply press the + or - button. If you want ...

Honeywell TH4110D1007 Temperature settings do not change. 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). "Cool On" or. "Heat On" is flashing. Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely ...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.https://raleighheatingandairservice.comHow to program a thermostat. Here we show the steps on how to program a Honeywell Focus Pro TH6000 series thermostat. ...1-800-468-1502. 2. Introduction. The Honeywell T6 Pro Z-Wave Programmable Thermostat is a Z-Wave Plus certi- fied thermostat capable of controlling up to three heat and two cool stages of heat pump, (incl. dual fuel heat pump systems) and up to two heat and two cool stages of conventional system (3H/2C HP, 2H/2C Conv.)Testing a Honeywell Thermostat. If the thermostat LED is lit, do a test by turning the thermostat to its maximum setting (in HEAT mode) or minimum setting (in COOL mode), turning the main control to AUTO or FAN and waiting for the blower to start. If it doesn't, remove the thermostat cover and check the wiring.To view the Appears when the setpoint setpoint temperature, press either of temperature is displayed. the temperature adjustment buttons once. Page 9 PRO 2000 Series Set the clock Press the Set button. Set Time will flash on the screen. Set Time Press the button to set the time. Press the Set button again.If you need to reset your Honeywell Home Pro Series thermostat, the process is quite simple. First, locate the control panel on the front of your thermostat and press down firmly for at least 3 seconds until all buttons appear on the display screen. Once they do, look for a button labeled “Reset” or “System Reset” and press it once to ...

To reset your Honeywell t4 Pro thermostat, follow these steps: 1. Locate the “MENU” button on the thermostat. 2. Press and hold the “MENU” button until the screen changes. 3. Navigate to “RESET” using the arrow buttons. 4. Select “RESET” and confirm the reset by pressing “YES” when prompted.Summary of Contents for Honeywell Home T6 Pro. Page 1 T6 Pro Programmable Thermostat User Guide – Package Includes: • T6 Pro Thermostat • UWP™ Mounting System • Decorative Cover Plate TH6320U2008, • Screws and Anchors TH6220U2000, • 2 AA Batteries TH6210U2001, • Thermostat Literature Read before installing Thermostat …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.FocusPRO® WiFiSmart Series . The Honeywell Home WiFi FocusPRO® 6000 allows remote access to the thermostat through a computer, tablet, or smart phone with Total Connect Comfort Service. ... Product Information on T6 Pro Smart TH6320WF Wi-Fi Series Programmable Thermostat (English, French, Spanish) View Resource: Product Information on T6 Pro ...The easiest way to create a portable QuickBooks database that you can access from different unconnected computers is to store the company file on a flash drive that you can physcia...

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Wait 5-10 minutes. Your thermostat could be facing a slight delay in restarting and activating …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). "Cool On" or "Heat On" is flashing. Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor (see page 5).It could be that your thermostat is not currently receiving power due to the batteries drying up or a problem with the power source. In either case, if your thermostat uses AA batteries, try replacing the batteries. If it is directly connected to a power source, then check if the power source is working or not. Check Connection Points.Honeywell “cool on” blinking is basically an indicator that tells that the thermostat is under operational mode to cool the temperature. It takes around 5-7 minutes to completely operate. Just leave your thermostat for a couple of minutes and cool on flashing on thermostat would automatically go away.Page 1: Thermostat Controls. Turn thermostat over, insert fresh AA alkaline batteries, then reinstall Product Manuals thermostat. Search online for Honeywell 69-1929EFS for the Installation Guide. Search online for Honeywell 69-1776EFS for the User Guide. 33-00300EFS-01...

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 blinking) on the thermostat display.This Honeywell Home Support page offers steps to bypass the schedule on your TH2210DH, TH2110DH, TH2210DV, or TH2110DV. ... Pro 2000 Horizontal Programmable Thermostat Support; T6 Pro Smart Thermostat Support ... cool switch is set to the desired run mode. Remember, after you set the desired setpoint and select your desired hold the thermostat ...PROA7PLUS ProSeries 7 inch All-in-One Panel. All-in-one Security system serves as a central hub for security and home automation with wireless controller, communicator, microphone, speaker and siren. Supports wide selection of sensors and devices using SiX™ two-way, wireless technology with highly secure AES-128 encryption.Sep 3, 2023 · An incorrect display can cause your Honeywell thermostat cool on to blink. To troubleshoot, verify the thermostat’s settings and programming: Ensure the thermostat is set to “cool” mode. Check if the cool on indicator is blinking or a solid light. Review your programmed temperature settings to ensure they’re accurate. Smart Response Learning. The T6 Pro 7-Day Programmable Thermostat learns your heating and cooling cycle times to deliver the right temperature when you want it. With precise temperature control, the thermostat can automatically change from heating to cooling to help maintain the temperature you like most. Intuitive Design.Here’s How to Fix It. What does the Honeywell thermostat “cool on” indicator mean? If your Honeywell thermostat displays a “Cool On” message, it simply …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.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.

If you're experiencing the Honeywell thermostat cool switch flashing problem, go are some troubleshooting steps ensure can help. Read is blog post fork more get. 914-939-4350

FocusPRO® WiFiSmart Series . The Honeywell Home WiFi FocusPRO® 6000 allows remote access to the thermostat through a computer, tablet, or smart phone with Total Connect Comfort Service. ... Product Information on T6 Pro Smart TH6320WF Wi-Fi Series Programmable Thermostat (English, French, Spanish) View Resource: Product Information on T6 Pro ...Cool on indicator flashing on Honeywell thermostat I have a honeywell pro th4000 series system. the cool on indicator is flashing. I have followed the instructions in the operating manual, however, it still keeps flashing.Even if you put it on Cool it will show Cool On flashing, it's normal operation it's to tell you the command is sent ... I have Honeywell t4 pro series my heat won't go past 77 I don't know why ... I have a Honeywell T4 Pro thermostat (battery, non 3 wire). I am in between seasons and just want to run the fan. I shut off heat/cool and ...The PRO Series 5007 is made to keep on going, supporting and protecting. 14″ Leather/Fabric Pull-on. Structural Boot. Made in the U.S.A. Width: D, E, EEE Full and half sizes 5 to 16. Certification: NFPA 1971 - Structural FF NFPA 1992 - Liquid Splash. Engineered for comfort, safety, and control, PRO Series BT5007 boots are simply unrivaled in ...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...If your Honeywell Thermostat Vision Pro 8000 is having trouble, there are a few things you can do to troubleshoot the issue. First, check the batteries. If the batteries are low, they may need to be replaced. If the batteries are fine, then check the thermostat's settings. Make sure the thermostat is set to the correct mode (heating, cooling ...The T6 Pro Z-Wave Programmable Thermostat is a Z-Wave Plus certified thermostat capable of controlling up to three heat and two cool stages of heat pump, (incl. dual fuel heat pump systems) and up to two heat and two cool stages of conventional system (3H/2C HP, 2H/2C Conv.) It also measures, displays and reports % indoorSelect the Menu and press Schedule . Choose the period you want to set the thermostat for. Adjust using the plus or minus icon. Tap the Temperature tab and choose the heating or cooling temperature you want. Press the Select tab until it says " Done .". Press the Select tab again to save the new temperature. You can easily adjust your phone ...Set Program Schedule For Two Time Periods 1. Select HEAT or COOL with the system key. Note: You have to program heat and cool each separately. 2. Press the MENU button (If menu does not appear first, press RUN SCHED). 3. Press SET SCHED.Note: Monday-Friday (Monday if in 7day) is dis played and the OCCUPIED text is shown.You are now program ming the OCCUPIED time period for that day.Possible reasons for no cool option on thermostat. Reas also: Honeywell Thermostat Not Blowing Cold Air. 1) A thermostat that needs reset. A lot of times honeywell thermostat issues can be cleared by just resetting the unit.

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Filtered Cool Moisture; Filter Free Cool Mist; Filter Free Warm Mist; Dual Comfort Cool + Warm Mist; ... Honeywell takes pride in ensuring effective air cleaning performance. To help ensure stated product performance and effectiveness, use only Genuine and Certified Honeywell replacement filters. ... Allergen Plus Series HEPA Consoles. Model ...View and Download Honeywell PRO TH3000 Series operating manual online. ... inside temperature Temperature setting Inside Set To Em Aux Replace Batt Low battery warning If "Heat On" or "Cool Heat On (see page 9) On" is flashing, com- pressor protection is engaged (see page 8). ... (Heat/Cool) PRO TH3110D / TH3210D System switch The ... 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. (Or the Y and O/B terminal if you have a heat pump system) In addition, the G ... 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 …Thermostats Take control of your home comfort and save on energy costs with a range of Honeywell Home thermostats. From smart WiFi thermostats with room sensors and humidification control, to programmable and non-programmable thermostats, Honeywell Home products meet a variety of needs.I have a honeywell home pro series. The year is flashing in top of screen select is at bottom but none of the buttons - Answered by a verified HVAC Technician ... It has come back on but Honeywell Pro Series control panel only shows month and year. Also an alarm inside is blaring every few seconds. ... fan on and off for cool or heat ...Foreign companies don’t quite know what to make of China’s leadership transition. Maybe that’s why Honeywell CEO David M. Cote’s simple advice tonight—telling businesses not to ove...The most common problem is that your compressor needs 5 minutes to cool down if your Honeywell thermostat is blinking "Cool On". Otherwise, you may need to clean or replace your AC filter if it is clogged with debris. Simply reset your circuit breaker if your Honeywell thermostat says "Cool On" but won't work after a power outage. ….

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.Learn more about Honeywell Thermostats from Resideo at: https://bit.ly/3mD8GLwLearn how to reset in just a few steps. You can also find detailed instructions...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.Hot flashes are a common symptom of menopause, but they can also be a symptom of anxiety. How do you know what’s causing your hot flashes? You can find out here. Figuring out what’...To adjust program schedules (RTH221) Press SET until Set Schedule is displayed. Press s or t to set your Wake time (Mo-Su), then press SET. Press s or t to set the temperature for this time period, then press SET. Set time and temperature for the next time period (Leave). Repeat steps 2 and 3 for each time period.I have a Honeywell programmable thermostat; model Focus Pro TH611OD / TH622OD. I set the fan to the "On" but it keeps cutting out every 3-4 minutes, for about 30 seconds each time. As a result, it is …Source : https://youtube.com/@mike1jagGo check him out ^^ Hope this was some help I don't know what the other settings are for that's the only one that I rea...Learn why the "Cool on," "Heat on," "Snowflake," or "Flame" is blinking on your thermostat device at the Honeywell Home Support and Resource Center.12,038 satisfied customers. Just moved into a new house with a honeywell thermostat. The. Just moved into a new house with a honeywell thermostat. The temp is set at 76. If I try to lower the temp it jumps back to 76. I can't seem to make read more. airheatman. HVAC Technician.If you have forgotten your 4-digit passcode, there are two things that you can try out to unlock your Honeywell thermostat: Insert 1234 as the passcode. If that didn't work, then look inside the thermostat and take note of the 4-digit date code; after that, add 1234 to the number. For example, if the date code is 0919, then insert 2153 as the ... Honeywell pro series flashing cool on, Testing a Honeywell Thermostat. If the thermostat LED is lit, do a test by turning the thermostat to its maximum setting (in HEAT mode) or minimum setting (in COOL mode), turning the main control to AUTO or FAN and waiting for the blower to start. If it doesn't, remove the thermostat cover and check the wiring., Remove the old batteries, noting where the positive and negative ends are placed. Dispose of them properly and then insert your new batteries. Slide the battery compartment back into place, bottom first. A little push, and it should snap back into place. With fresh batteries, your thermostat should automatically turn back on in a few minutes., 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., Troubleshooting guide: Why is your Honeywell thermostat flashing 'Cool on'? Get answers to fix HVAC issues fast..., To factory reset this thermostat, first press the System button. Now you must press and hold the blank box that's in the center of the screen. When the number panel is displayed, set the number on the left to 0710 and the number on the right to one. Once this is done, press the Done button., Honeywell TH6320U2008 T6 Pro Series 3 Heat/2 Cool Programmable Thermostat OPEN. lucky7market (6127) 99.9% positive; Seller's other items Seller's other items; Contact seller; US $27.99. Condition: Used Used. Buy It Now. Honeywell TH6320U2008 T6 Pro Series 3 Heat/2 Cool Programmable Thermostat OPEN. Sign in to check out. Check out as guest. Add ..., In this video, we show you a basic tutorial on how to replace batteries on a T6 Honeywell Thermostat Pro Series. Anytime you do this, make sure to unplug you..., If COLD, this means your thermostat is cooling correctly, but the heating isn't working properly. Contact Support at 1-855-733-5465 to find a pro-installer in your area. If WARM/HOT, this means your reversing valve may not be configured or wired properly. Continue to the Thermostat Wiring section., Page 1: Thermostat Controls. 3000 Digital Thermostat Series User Guide Read and save these instructions. For help please visit yourhome.honeywell.com Thermostat controls Temperature adjustment Press the up or down buttons until you reach the desired temperature. NoTe: Make sure the SYSTEM switch is set to the system you want to control (Heat or ..., 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. Wait 5 minutes for the system to restart safely, without damage to the compressor (see page page 5)., On my Honeywell Home Pro Series thermostat there 3 things going on. 1. Cool on is flashing in top left corner. 2. A triangle is light in middle of top of display. 3. Top right corner by Wi-fi there is … read more, Honeywell TH6220WF2006/U Lyric T6 Pro Wi-Fi Programmable Thermostat with Stages Up to 2 Heat/1 Cool Heat Pump or 2 Heat/2 Cool Conventional . Connected, simple and smart, the T6 Smart Thermostat and adapts to your lifestyle. It can learn your preferred comfort levels over time and heats or cools on schedule. ... Honeywell TH6320ZW2003 T6 Pro ..., From https://www.justanswer.com/ythiJACUSTOMER-63s3by4n-: HVAC Technician: I have a honeywell pro th4000 series system.JACUSTOMER-63s3by4n-: HVAC Technician:..., Hello I have a Honeywell T4 Pro that was flashing "Cool On" on the right side of the screen. Nothing seems to help I did replace the batteries and it stopped blinking and now it is solid "Cool On" When I run the test it does kick the AC on. So the AC itself is fine. It seems like it is something with the thermostat. It has fresh batteries., The PRO 3000 series non-programmable digital thermostat has 2 heat/1 cool stage for heat pump systems. ... PRO 3000 Series 2 Heat/1 Cool Non-Programmable Digital Thermostat ... Honeywell Home: Built In Wi-Fi: No: Change/Check Reminders: No: Country of Origin: MEX:, Smart Response Learning. The T6 Pro 7-Day Programmable Thermostat learns your heating and cooling cycle times to deliver the right temperature when you want it. With precise temperature control, the thermostat can automatically change from heating to cooling to help maintain the temperature you like most. Intuitive Design., Heat and cool settings must be at least 3 degrees apart. The thermostat will automatically adjust settings to maintain this 3-degree separation (called "deadband"). The 3-degree separation between heating and cooling set temperatures is fixed, and cannot be changed. Press system button until screen displays "Auto". , Make sure the breaker is in the "ON" position or replace any blown fuses. If the thermostat is battery-powered, check the battery statu s and replace the batteries if necessary. Sometimes, cooling issues can arise if the Honeywell ProSeries thermostat is not correctly connected to the power source., 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 70 ..., All Honeywell thermostats that have batteries store the batteries in the control panel. Locate the batteries by removing the battery compartment tray or cover or by removing the unit's faceplate. Carefully extract the batteries, and replace them. Be sure to place the batteries in the correct orientation. The battery-powered control unit of ..., 12,038 satisfied customers. Just moved into a new house with a honeywell thermostat. The. Just moved into a new house with a honeywell thermostat. The temp is set at 76. If I try to lower the temp it jumps back to 76. I can't seem to make read more. airheatman. HVAC Technician., If your Honeywell thermostat isn't working after you replace the batteries, here are the top 4 things you need to do, in order: Double-check the installation. Examine the batteries. Test the fan. Reset the thermostat. Let's take a look at each of these steps in detail., In that case, you'll just have to set the temperature, and then press the key under "Hold" to activate the "Temporary Hold" feature. Again, depending on what model Honeywell thermostat you're using, the steps you should take may vary. For example, the latest programmable thermostat Honeywell, the Honeywell ZStat Z-Wave Thermostat ..., Honeywell 6000 series: When your device is 'ON,' press and hold the 'Fan' button followed by the 'Up' arrow button, hold these buttons for about 5 seconds before releasing. Press the button on the bottom left until the number on the display panel changes to '39'. Next, press the 'Down' arrow button until you see '0' and ..., 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 point, the thermostat display should indicate a call for cooling. 2. Confirm that the circuit breakers are on., 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 thermostat., Honeywell Th1110D2009 Troubleshooting. 1. Check the power source to make sure it is connected and working properly. 2. Make sure all connections are secure, including any wiring that connects the thermostat to your HVAC unit or other components of your home heating/cooling system. 3., RCHT8612WF2015/U, SMHOM8610KIT, RCHT8612WF2015/W, RTH8800WF2022/U, RCHT8610WF2006/U. Download Manual Download Installation Guide. Download Service Datasheet. T5 SMART THERMOSTAT Product Page., Step 1: Check Wi-Fi Signal Strength. Weak Wi-Fi signals are the primary cause of connectivity issues in smart thermostats, so by improving the signal can make a world of difference. To see if this is the case, check the signal strength using the Wi-Fi signal bars indicator on your smartphone or smart device. If your smartphone shows low Wi-Fi ..., Customer: HONEYWELL PRO SERIES JA: ... I have a Honeywell T4 Pro that was flashing "Cool On" on the. Hello I have a Honeywell T4 Pro that was flashing "Cool On" on the right side of the screen. Nothing seems to help I did replace the batteries and it stopped blinking and now it is solid "Cool On" Whe ..., Position the Cover Plate on wall. Level and mark hole positions. See Figure 1. Drill holes at marked positions, and then lightly tap supplied wall anchors into the wall using a hammer. If your box contains red anchors, drill 7/32” (5.6 mm) holes. If your box contains yellow anchors, drill 3/16” (4.8 mm) holes., How to enable Auto mode on their Honeywell T6 Pro thermostat: How to turn on Auto Change in Honeywell ProSeries Thermostat. 1.Access the advanced settings menu (option 300). 2.Locate the setting that enables Auto mode. 3.Once enabled, use the Mode button on the thermostat to set it to Auto mode., 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.