Honeywell home pro series thermostat flashing cool on

Sometimes, you might see the reading on the screen is blinking heat on. Generally, the Honeywell thermostat blinks for protection purposes. A blinking heat on signal indicates that a safety timer’s tripping that will protect the compressor of your thermostat. Sometimes, it might indicate a low battery.

Honeywell home pro series thermostat flashing cool on. 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 ...

T6 Pro Smart Thermostat Multi-Stage 2 Heat/2 Cool. SKU: TH6220WF2006/U. Control Your Comfort. The T6 Pro Smart Thermostat can give you home comfort control from anywhere. Connect to the app to view and change temperature settings, program a 7-day schedule or just let the T6 respond automatically it's designed to work with the heating …

Summary of Contents for Honeywell Home T1 Pro. Page 1 T1 Pro Product TH1110D2009 Information TH1010D2000 Built-in compressor protection Thermostat controls Damage can occur if the Message flashes until safe • System status • Indoor temperature compressor is restarted restart time has elapsed. information setpoint too soon after shutdown.In this video I instructions for the correct and easy way to replace the two AA(double A) batteries in a Honeywell pro series T4 thermostat. When the batteri...17 Feb 2023 ... ... thermostat temperature, there may ... How to program Honeywell Home Pro Series push button thermostat ... Excellent Air Heating and Cooling•147K ...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. The programmable thermostat comes with …Nov 19, 2022 · 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. Jan 25, 2022 · Select your Home Wi-Fi network name and touch “CONNECT”. For hidden networks, touch the “OTHER” button to enter the network name/SSID manually. Enter the password for your Home Wi-Fi network. Touch “NEXT”. You will receive a “Success” message. Step2- Register your thermostat. The 4000 series comes with a reset button. To reset, turn on the thermostat and press the “Program” button thrice. Then find the reset button located inside a small hole on the front panel of the thermostat and use a sharp object to press the button for about 5 seconds. Now your thermostat has been reset.

Make sure function 38 is set to 1, then proceed to function 39. Use the up or down arrow to change function 39 function to 0 then press done. WiFi setup will then be displayed on the screen.*. Step 2 – Connect the thermostat to your home WiFi (via an internet browser on your mobile device) After connecting to the thermostat WiFi ...Low Refrigerant. How to Fix Honeywell Thermostat Cool On Blinking Light. 1. Lower Thermostat Temperature. 2. Check Thermostat Batteries. 3. Inspect Electrical …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. 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 ...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. The programmable thermostat comes with … The FAN selection key has two or three positions: Auto, On, and on select models, Circ (Circulate). The Auto position will allow the system fan to operate whenever the heating or cooling system is turned on by the thermostat. The fan will not blow air unless there is a call from the system. This is the normal setting for a system fan. The On ... Check the Door of the Furnace. The common Honeywell thermostat problem is caused by the door on the furnace, which is not fully shut. So, you have to shut the furnace’s door correctly to get the power to the thermostat back. Then, you can reset the thermostat and use it just like before. Read also: Honeywell Thermostat Vision Pro Troubleshooting.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.

Tie red, yellow and green together and see if unit will stay on. If so, problem is thermostat.If not we need to find what is causing the unit to shut down.It can be a pressure switch, float switch or issue with control board. Furnace, A/C and heat pump specialist.2 Oct 2021 ... ... thermostat dt90e" "how to program honeywell digital thermostat ... Honeywell Home 9000 Series thermostat and Vision Pro ... "Cool On" Is Blin...13 Mar 2022 ... Honeywell RTH2510 Thermostat | Factory RESET & SETUP Menu Options | RTH Series UPDATED ... Honeywell Focus Pro ... Honeywell Home FocusPro ...To reboot other Honeywell Pro Series thermostats, you would have to: Turn the device on. Press and hold the ‘menu’ button for 5 seconds. Scroll to the left and select ‘reset’. You might have to confirm your decision by pressing ‘yes’. When the HVAC system is actively cooling your house, a ‘cool on’ message will get displayed on ...

Tampa bay power outage.

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.Replace the battery: Remove the old battery and replace it with a new one. Be sure to follow the manufacturer’s instructions for inserting the battery correctly. Reattach the thermostat cover: Once the new battery is inserted, snap the thermostat cover back into place. Turn the power back on: Finally, turn the power back on to the thermostat ...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.Make sure function 38 is set to 1, then proceed to function 39. Use the up or down arrow to change function 39 function to 0 then press done. WiFi setup will then be displayed on the screen.*. Step 2 – Connect the thermostat to your home WiFi (via an internet browser on your mobile device) After connecting to the thermostat WiFi ...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 …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 ...

Get live help with your issue. Having trouble with your Honeywell thermostat? Browse Honeywell Home’s library of thermostat troubleshooting resources and guides.Reset procedures vary widely depending on the model of the Honeywell thermostat, but they include pressing System to reconfigure the settings or temporarily inserting the batteries...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.To reboot other Honeywell Pro Series thermostats, you would have to: Turn the device on. Press and hold the ‘menu’ button for 5 seconds. Scroll to the left and select ‘reset’. You might have to confirm your decision by pressing ‘yes’. When the HVAC system is actively cooling your house, a ‘cool on’ message will get displayed on ...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 …Honeywell thermostat is on but not cooling. Troubleshooting a Honeywell thermostat. Check your settings. Be patient. Reset the thermostat. Change the …The simplicity of the Honeywell Home PRO 2000 vertical thermostat from Resideo makes it an easy upgrade from basic up-down temperature controls without committing to a WiFi-connected thermostat. The PRO 2000 vertical thermostat has a large, backlit screen that is easy-to-read and features a real-time clock, with simple push-button controls.Honeywell thermostats are designed to control the heating and cooling systems in your home, making it comfortable and energy-efficient. Honeywell thermostats are equipped with various symbols that help you understand and operate the thermostat. However, understanding these symbols can sometimes be confusing, especially for new users. In this guide, we will discuss the most common...When your Honeywell thermostat works in Recovery Mode, it simply means that the thermostat is trying to adjust towards a previously set temperature according to the schedule you established. For example, if the thermostat is set to cool down a room to 70 degrees at 8 pm, then the HVAC system should start working before …Look for the power button on the thermostat and press and hold it for about 5-10 seconds until the display turns off. Once the display is off, release the power button and wait for a minute or two. Then, press the power button again to turn on the thermostat. This should reset the controls and make them responsive again.Honeywell thermostats are designed to control the heating and cooling systems in your home, making it comfortable and energy-efficient. Honeywell thermostats are equipped with various symbols that help you understand and operate the thermostat. However, understanding these symbols can sometimes be confusing, especially for new users. In this guide, we will discuss the most common...

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.

Change the batteries. Replace air filters. Check the furnace door/power switch. Inspect air conditioner coils. Replace the thermostat. Call in an HVAC specialist. Honeywell thermostat set to cool but heating. Confirm the thermostat is set up properly. Lower the temperature on the thermostat.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.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.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 ...May 27, 2010 · Okay, let's try this: first, turn the thermostat off, then remove the batteries from the thermostat and leave out until the display goes completely blank. Now, reinstall the batteries and turn the switch back to cool and lower the desired temp below the indoor temp. The 'cool on' may flash, but leave the thermostat alone for 5-10 minutes and ... Scroll down to “Thermostat Information. Record the “Date Code”. Press the “back” arrow, then scroll down to “Installer Options”. Enter the Date Code when prompted to “Enter your password”. Select “Reset”. Select “Factory Reset”. PERFORMING A WiFi RESET. Press the Menu icon. Scroll down to “WiFi” and select it.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.PRO 4000 Series Programmable Digital Thermostat Installation Instructions (English, French, Spanish) - Legacy Product Document View Resource: PRO 4000 Series Programmable Digital Thermostat Installation Instructions (English, French, Spanish) - Legacy Product DocumentCar thermostats fail when the valve of the thermostat fails to open, fails to close or gets stuck in a partially-open position. As the thermostat controls the flow of coolant to th...

Dr collins sein waldorf md.

Minnesota reptile expo.

The reason why your Honeywell thermostat is reading the wrong temperature could be due to improper placement/alignment inside your home. Problems will also pop up involving your thermostat if you haven’t cleaned it in a while. Older Honeywell thermostats will also have a tougher time reading the temperature accurately.Step 1. Change the Temperature. The first thing you can do if your thermostat display is on, but doesn’t power on the HVAC system, is to adjust the temperature. So, first, try changing the temperature on your Honeywell thermostat. Also, make sure the desired temperature falls within the acceptable ranges.5 Jan 2021 ... ... Honeywell T4R Red Flashing light ... How to Use Your Honeywell T4 Pro Thermostat ... Installing the Honeywell Home T3 series programmable thermostat.Sep 15, 2023 · Change the temperature to the lowest possible. The first thing you should do is to make sure if the thermostat can regulate the temperature or not. Adjust the controller settings and see if the cooling works. Now set the temperature to the lowest possible while the mode is set to ‘Cool’ and the fan setting is on ‘Auto’. The T1 Pro Non-Programmable Thermostat comes with the standard UWP mounting system. The soft key controls (with a 2.37 sq. in. display) and the easy-to-read LED back light make this thermostat from Resideo one of the best choices in temperature control on the market. SELECT A MODEL: T1 Pro Non-Programmable Thermostat - 24 Vac. 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.This is the quickest and easiest method. Simply follow the steps outlined below to reconfigure the thermostat to match your existing system. Step 1. Touch the menu icon (can be 3 horizontal lines at bottom of display) Step 2. Scroll down and touch “Advanced setup”. Step 3. Then touch “modify configuration”. Step 4.You can select which rooms/smart room sensors you want your thermostat to focus on (which rooms it should measure). For example, during nap time, you may want the nursery room prioritized so the baby sleeps at the ideal temperature. In this case, you can set the priority via a simple voice command; or those rooms are prioritized when … ….

Resetting the Honeywell thermostat to the default factory setting will delete all your saved settings. Follow the steps below to reset the Honeywell Vision Pro 8000 series. Press the “MENU” button. Go to the “PREFERENCES” tab. Scroll down and click on “RESTORE TO FACTORY DEFAULT.”. Tap “YES” to confirm the factory reset.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.Press and hold the Fan Button and Up Arrow for about 5 seconds to change the screen. Press Back Button or Next Button until 39 appears on the left. Press the Up or Down Arrows to change the number on the right to 0. Press Done Button. “WiFi Setup” will appear on the thermostat screen after 1-2 minutes. To reconnect the thermostat to WiFi.Incomplete thermostat wiring could cause a Honeywell thermostat to flash heat on, but no heat is coming. 4. Thermostat Settings Could Cause a Honeywell Thermostat Flashing Heat On But No Heat. One of the commonest issues that homeowners overlook is the thermostat setting. You need to make sure that the …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".Here’s how to fix it: Make sure the thermostat is set to the desired temperature for heating. Try to change your thermostat settings manually. This can be done by pressing the “Up” arrow. After that, press the option that says “Switch to Permanent Hold.”. Your thermostat setting will then switch by matching the outdoor temperature.COLUMBIA THERMOSTAT FUND INSTITUTIONAL 3 CLASS- Performance charts including intraday, historical charts and prices and keydata. Indices Commodities Currencies StocksLow 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. Remove the cover and check for dust, dirt, or corrosion, cleaning it with a soft brush or cloth if necessary.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, usually indicated by the words “cool on” or a snowflake icon. If these icons are flashing, the thermostat is in delay mode, which can last up to 5 minutes.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. Honeywell home pro series thermostat flashing cool on, Return mode starts flashing whenever the Honeywell thermostat is preparing in advance for the “Return” or “Home” schedule periods. ... Via the Honeywell Home App. Schedule Mode: Options between 1-Week, 5+2, and 7-day programming. Relabeled as “Grouped Days,” “Schedule” and “Single Days.” ... PRO 4000 and RTH 2300 ..., Option 1: Soft Resetting Procedure. Sometimes, all it takes is a soft reset to get your Honeywell Thermostat Pro Series back on track. Think of it as a gentle nudge to remind your thermostat who’s in charge. With just a few simple button presses, you can clear minor issues and restore your thermostat to its optimal state., Connected to your existing WiFi, the T6 Pro Smart Thermostat is already part of the family. Integration with your Apple HomeKit and Amazon Echo lets you adjust your temperatures as easily as you change songs on your playlist. This thermostat also works with your heating systems stages, up to 3 Heat/2 Cool with heat pump. Energy Savings., Look for the power button on the thermostat and press and hold it for about 5-10 seconds until the display turns off. Once the display is off, release the power button and wait for a minute or two. Then, press the power button again to turn on the thermostat. This should reset the controls and make them responsive again., Sep 30, 2023 · Reason 1: Incorrect Temperature Setting. When your thermostat displays “Heat On” but doesn’t produce warmth, it’s often because the temperature setting isn’t above the room’s current temperature. This causes the heating system to remain idle, despite the thermostat’s indication. The thermostat’s primary function is to maintain ... , 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., Press the 'Up" or "Down" arrows until the right side of the screen changes from 1 to 0. Select "Done." Allow two minutes for "WiFi Set-up" to appear on the thermostat screen. On your mobile device, turn on Airplane mode, turn on WiFi, then select and connect to the “New Thermostat xxxxxx” network., 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., How do I fix a blank display on my TH6210U2001, TH6220U2000, TH6320U2008 thermostat? If the thermostat is battery powered, check/replace your batteries. If the device is common wired, try and power it up with batteries. If that fails to power up the thermostat, you may need to involve a technician. If batteries do power up …, 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.’., 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., If your thermostat is blinking “cool on” one of three things has taken place. Someone tried to restart the compressor before the refrigerant had time to settle. 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 ..., 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 ..., 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., The simplicity of the Honeywell Home PRO 2000 Horizontal thermostat from Resideo makes it an easy upgrade from basic up-down temperature controls without committing to a WiFi-connected thermostat. The PRO 2000 thermostat has a large, backlit screen that is easy-to-read and features a real-time clock, with simple push-button controls., Dec 15, 2022 · 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. , 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 ..., Reduce the temperature setting on the thermostat to the minimum possible value. Set your gadget to the lowest temperature possible and ensure that the ‘Cool’ mode is selected. In case, if your Honeywell Thermostat indicates cool on but no air is coming out. You should verify that the fan setting is set to Automatic., 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., 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., Oct 15, 2022 · To reboot other Honeywell Pro Series thermostats, you would have to: Turn the device on. Press and hold the ‘menu’ button for 5 seconds. Scroll to the left and select ‘reset’. You might have to confirm your decision by pressing ‘yes’. When the HVAC system is actively cooling your house, a ‘cool on’ message will get displayed on ... , 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 …, Details: Download the Honeywell Home app and follow the steps to link your thermostat to your Wi-Fi network. 546: Problem: (For Z-Wave models) Z-Wave Not Configured Details: The thermostat has not yet been configured to receive commands from your Z-Wave network. Check the user guide to enroll the thermostat to your Z-Wave network., Set your thermostat to the lowest temperature reading while making sure the mode is set to Cool. Also, make sure that the fan setting is set to Auto, especially if your Honeywell Thermostat says cool on but no air seems to come out. Doing this will let you check if your thermostat can reliably control the cooling within your home., Do all the fixes fail for you? Don’t worry; one last troubleshooting is available. Try a factory reset to your thermostat. Sometimes, smart devices develop irregular glitches and function unusually. It is obvious for old devices, so power cycling or resetting the thermostat would fix the honeywell pro series thermostat cool on flashing problem., Summary of Contents for Honeywell Home T1 Pro. Page 1 T1 Pro Product TH1110D2009 Information TH1010D2000 Built-in compressor protection Thermostat controls Damage can occur if the Message flashes until safe • System status • Indoor temperature compressor is restarted restart time has elapsed. information setpoint too soon after shutdown., 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 ..., 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., Get live help with your issue. Having trouble with your Honeywell thermostat? Browse Honeywell Home’s library of thermostat troubleshooting resources and guides., Troubleshooting guide: Why is your Honeywell thermostat flashing 'Cool on'? Get answers to fix HVAC issues fast..., Contents hide 1 Honeywell Home PRO 1000 Non-Programmable Thermostat 2 About your new thermostat 2.1 Features 3 A quick reference to controls 3.1 Select the system setting 4 Built-in compressor protection 4.1 Battery replacement 5 In case of difficulty 6 2-year limited warranty 7 Reference Honeywell Home PRO 1000 Non …, 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., 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.