Honeywell thermostat pro series cool on flashing

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 your common wired ...

1. Check Thermostat Settings. 2. Check Your Thermostat’s Battery. 3. Set Your Thermostat to The Lowest Temperature. 4. Check If Both the Outdoor and Indoor Units Have a Power Supply. 5. Clogged Air …Honeywell Home PRO 1000 Non-Programmable Thermostat. This manual covers the following models: TH1210DV: For 2 Heat/1 Cool heat pump systems (Pull the thermostat from the wallplate and turn it over to find the model number.) To prevent possible compressor damage, do not operate the cooling system when the outdoor temperature is below 50°F (10°C).The T4 Pro Programmable Thermostat is easy to install with on-screen menus to display installation steps and a universal mounting system. It's even easier to use with simple push button controls, allowing you to adjust the temperature or set a heating and cooling schedule. Adaptive Intelligent Recovery. Over time, the T4 Pro Programmable ...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 ...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.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.Curious about your Honeywell thermostat's blinking 'Cool On' indicator? Decode the signal, troubleshoot, and keep your cooling system in check effortlessly. ... When your Honeywell thermostat's 'Cool On' indicator blinks, it's not a cause for panic. This blinking signifies a delay designed to protect your heating and cooling equipment ...A ‘cool on’ message will be flashing on your Honeywell thermostat, in case the system is in delay mode or if the batteries need to be changed; simply wait for 5 minutes or change the batteries and the …

The thermostat then turns on the heating or cooling at just the right time to reach your scheduled temperature at your scheduled time. For example: Set the Wake time to 6 am and the temperature to 70°. The heat will come on before 6 am, so the temperature is 70° by the time you wake at 6.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...Learn how to use your Honeywell T4 Pro Thermostat with Josh from Roy'sThis video details:Power troubleshootingFeaturesBasic OperationCompressor Protection. Honeywell thermostats can read "Cool On" or "Heat On" without working to protect the compressor. This built-in function can trigger when you turn the heat back on too soon after the system turns off. Otherwise, your compressor can overload, and it may break from too much pressure and overuse.Make sure the temperature is set higher than the Inside temperature. Set system switch to Cool. Make sure the temperature is set lower than the Inside temperature. Wait 5 minutes for the system to respond. Check circuit breaker and reset if necessary. Make sure power switch at heating & cooling system is on.

Honeywell RTH2510 Series User Manual View and Read online. Est. reading time 10 minutes. RTH2510 Series Thermostat manuals and instructions online. ... When Cool On is flashing, compressor protection is engaged. ... Honeywell T10 PRO Smart Thermostat Installation Guide (article) Honeywell FocusPRO 5000 Series ManualDo 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.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.An existing 4 wire set-up may create a new C-Wire using the adapter THP9045A1098 . The T Series programmable thermostat streamlines everything from product selection and installation to customer service and support. ... O/B, G, K, E, L/A, S, S Package Includes: Lyric T6 PRO Wi-Fi Thermostat UWP Mounting System Honeywell Standard Installation ...With the Honeywell Home PRO 3000 Non-Programmable Thermostat from Resideo, you can expect years of reliable temperature control. Complete with push-button climate control, an easy-to-read backlit display, and professional installation. Other features include: Displays both room temperature and temperature setting; One-touch temperature controls20 Apr 2020 ... Honeywell Pro Series Thermostat Battery Replacement (BATT) ... How to Use Your Honeywell T4 Pro Thermostat ... HVAC Thermostat Blinking Cool On But ...

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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.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.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.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.Have a Honeywell T4 Pro thermostat. Does not display anything but flashing 2023 in upper LH corner and select in lower - Answered by a verified HVAC Technician ... Honeywell home pro series thermostat. It's not even 2 years old ... Honeywell ProSeries display reads "Cool On" "Fan On" "Permanent Hold" and temp reads 25 degrees. ...

Why is My Honeywell Thermostat Flashing Cool On? When your Honeywell thermostat displays “Cool On,” it indicates that your cooling system is activated, even though you …Final Thoughts on Fixing a Honeywell Thermostat red Light. While we have seen possible causes for the honeywell thermostat red light, all reasons and possible fixes may apply to other thermostat brands. But If you are still facing the problem after trying out all the tips, it's perhaps a good idea to call local professionals for help 1 About your new thermostat. 1.1 Features. 2 Quick reference to controls. 3 Quick reference to display screen. 4 Set the time and day. 5 Select the system setting. 6 Select the fan setting. 7 Save money by setting program schedules. 8 Energy saving settings for maximum cost savings. 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 lighting conditions. SELECT A MODEL: PRO 3000 1 Heat/1 Cool Non-Programmable Digital Thermostat. 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 ...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.It depends, if the thermostat is powered with a 24 Vac common it can be set to have continuous backlight. If the thermostat is battery powered, it cannot be set for continuous backlight. This is done by the installer in the installer setup settings of the thermostat. (Note, some models always require a common regardless of backlight setting).WIFI SMART COLOR THERMOSTAT Manual & Support. RTH9585WF1006/W, RTH9585WF1004/U. Download Manual. WIFI SMART COLOR THERMOSTAT Product Page.

or call Honeywell Customer Care toll-free at 1-800-468-1502. This manual covers the following models: TH5110D:For 1 Heat/1 Cool systems. TH5220D:For up to 2 Heat/2 Cool systems. TH5320U:For up to 3 Heat/2 Cool systems. MCR29404(Remove battery holder to find model number) FocusPRO. ®TH5000 Series 1 69-1923EFS—01. ENGLISH.

Reason 7. Low on Refrigerant/ Refrigerant Leak. A refrigerant leak or low levels of refrigerant in your Honeywell thermostat can lead to short cycling. In this situation, short cycling occurs when the low-pressure switch shuts off the system when it detects low refrigerant.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 moreMake 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).If you replaced the batteries on your CT3200, CT3300, T8112, T8132 thermostat and are still getting the LOW BAT message, follow these steps: 1. Remove the batteries from the thermostat and place them in the opposite / wrong / incorrect position in the thermostat place the (+) on the (-) and vice versa). 2. Leave the batteries like that …When troubleshooting a Honeywell thermostat blinking cool on but not working issue, it is essential to check the thermostat settings. Start by adjusting the temperature settings to ensure they are accurately reflecting your desired comfort level. Additionally, examine the mode settings to verify that the system is set to cool mode. ...SKU: TH8321WF1001/U. 2.9. |. 20 out of 71 (28%) reviewers recommend this product. With a large touchscreen display, the VisionPRO® 8000 WiFi Programmable Thermostat makes it easy to control your home comfort. Program a schedule for every day of the week or adjust the temperature remotely anytime from the Total Connect Comfort app.First check that the thermostat is set to the Heat position. Make sure the temperature is set higher than the Inside temperature reading. Also check the circuit breaker and reset if necessary. Make sure that the furnace door is closed securely. If “wait” is in the screen or “heat on” is flashing – wait 5 minutes for the system to ...2/22/22. Cycles per hour (cycle rate) is a measure of how many times per hour your heating or cooling system will turn on and off. You do not need to select a cycle rate as part of setting up your Lyric; it will automatically suggest a cycle rate appropriate for your system based on the information you provide.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.yourhome.honeywell.com RTHL2510/RTHL2410 Series Programmable Thermostat Identify System Type This thermostat is compatible with the following systems: • Gas, oil or electric furnace • Central air conditioner • Hot water system with or without pump • Millivolt system • Central heating and cooling system • Heat pump without auxiliary ...

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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 SupportA 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 ...Installing your RTH7400/RTH7500 thermostat. Bundle and insert wires through the UWP. Pull open the UWP and insert the bundle of wires through the back of the UWP. Make sure at least 1/4-inch (6.3 mm) of each wire is exposed for easy insertion into the wire terminals. Insert the wall anchors.1 Common Issues With Honeywell Pro Series Thermostats. 1.1 Thermostat Not Working. 1.2 Blank Screen Or Unresponsive. 1.3 Thermostat Not Heating Up. 2 Troubleshooting Solutions. 2.1 Check Power Source And Batteries. 2.2 Inspect Circuit Breaker. 2.3 Ensure Indoor Unit Doors Are Closed. 2.4 Restart The Thermostat.From the locked home screen, press the center button. Users will need to enter the passcode. The default passcode when the Honeywell T4 Pro is partially or...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 ...2/22/22. Cycles per hour (cycle rate) is a measure of how many times per hour your heating or cooling system will turn on and off. You do not need to select a cycle rate as part of setting up your Lyric; it will automatically suggest a cycle rate appropriate for your system based on the information you provide.La boîte comprend : Thermostat T4 Pro. Système de montage UWPTM. Adaptateur d'installation standard Honeywell (adaptateur boîtier de raccordement) Plaque de couvercle décorative Honeywell - Petite; dimension 4-49/64 po x 4-49/64 po x 11/32 po (121 mm x 121 mm x 9 mm) Vis et chevilles. 2 piles AA.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 …Thermostat non programmables. Termostatos no programables. PRO 1000 Series. This manual covers the following models: TH1100D: For 1-Heat systems TH1110D: For 1-Heat / 1-Cool systems. TH1210D: For 2-Heat / 1-Cool heat pump systems. (Remove the thermostat from its wallplate to find the model number.) CAUTION: EQUIPMENT … ….

https://raleighheatingandairservice.comHow to program a thermostat. Here we show the steps on how to program a Honeywell Focus Pro TH6000 series thermostat. ...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 …Google’s Nest unit today launched its newest thermostat. At $129, the Nest Thermostat is the company’s most affordable one yet, but it’s also the first to feature a new swipe and t...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.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 ...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.2. Broken Thermostat Wiring Honeywell Smart Thermostat RTH9580WF wall plate, mounted, with wires connected. Problem. The solid copper wires in the thermostat cable can break if flexed too often. Or, perhaps the installer stapled the cable with too much pressure or stapler misalignment, and nicked the cable.Luckily this is an easy enough thing to fix. All you need to do is change the batteries in the thermostat. Take a look at the display to see if the "battery low" light is flashing. As soon as your thermostat starts to display this warning, you normally have around 2 months before the power will start to fail.The fan symbol on a Honeywell thermostat represents the fan mode. It indicates whether the fan is set to “auto” or “on” mode. If the fan symbol is illuminated, it means that the fan is set to the “on” mode and will run continuously, even when the temperature is not being regulated. If the fan symbol is not illuminated, it means that ...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. Honeywell thermostat pro series cool on flashing, Operating Manual Fan switch 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. Use this setting for improved air circula- tion, or for more efficient air cleaning., 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 ..., Honeywell is one of the biggest names in home heating. Whether it’s a basic analog thermostat found in an older house or a state-of-the-art smart home interface that manages heatin..., Aspect 4: Check whether you've installed the batteries correctly. If you've tested the batteries in other household devices and the batteries have worked in every device except the thermostat, you might have installed the batteries incorrectly. Put the batteries back again after you've verified the orientation they should be in., 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., Description. Use Honeywell TH8320U VisionPro 8000 Series touch-screen programmable thermostat (TH8320U1008, TH8320U1016) to set the correct temperature in your home. Thanks to the large number of settings, you will be able to choose the right mode and convenient parameters. In the operating manual on 32 pages you will find all the information ..., 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 6000 Series: If your thermostat falls under the Honeywell 6000 Series category, make sure the thermostat is turned on. Then, press and hold the "Fan" button as well as the "Up" arrow. Hold these for about five seconds, then release them. Press the button on the bottom left until you see "39" on the display., Different ways to secure the panel for Honeywell Thermostats. 3. Check the Batteries. One of the most common causes of issues with thermostats is the battery running out or being faulty. Honeywell thermostats are no exception. Faulty batteries could be causing your thermostat's screen to go blank and unresponsive., A Honeywell thermostat will go blank, in case the device is off (there is no power, the circuit breaker had tripped, the batteries are dead), there are issues with the wiring, or the safety switch had tripped. Low display brightness can also be the root cause of the problem. Why Does Honeywell Thermostat Go Blank?. The thermostat might simply be off; There is no power to the thermostat, 8 Set fan operation switch. Move the switch to the proper setting: Gas or Oil: For gas or oil heating systems, leave the fan operation switch in this factory-set position (for systems that control the fan in a call for heat). Electric or Heat Pump: Change the switch to this setting for heat pump or electric heat systems., If your Honeywell Thermostat is flashing ‘Cool On’ , set the temperature to the lowest setting. Then reset your Honeywell Thermostat. I’ve also gone into detail …, If you notice a blinking snowflake or flame emblem on the screen of your thermostat when you try to turn on your air conditioner that means that your system just recently shut off and the thermostat is in delay. When you try and start your air conditioner before the delay timer has gone off it will show the snowflake emblem on your thermostat ..., If your new Honeywell thermostat is blowing hot air on the cool setting, there are a few possible solutions. First, check to make sure that the thermostat is set to cool mode and not heat mode. If it is set to heat mode, the thermostat will blow hot air. Second, check the settings to make sure that the temperature is set correctly., Why is the "Cool On," "Heat On," "Snowflake," or "Flame" blinking on the thermostat display? 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 system to safely respond., 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 ..., 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 ..., 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., 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 ..., If you replaced the batteries on your CT3200, CT3300, T8112, T8132 thermostat and are still getting the LOW BAT message, follow these steps: 1. Remove the batteries from the thermostat and place them in the opposite / wrong / incorrect position in the thermostat place the (+) on the (-) and vice versa). 2. Leave the batteries like that …, 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 ..., If your Honeywell thermostat won't go above 70, it is likely due to the temperature limit setting. You can adjust this setting using the up and down arrows on your thermostat. To do this, press "Settings" and then select "System.". From there you will need to scroll down until you see "Heat/Cool Limit Set.". Once selected, use the ..., Contents hide 1 Honeywell Home T4 Pro Thermostat Wiring Diagrams 2 WIRING DIAGRAMS 2.1 Stage Cool Only 3 Transformer System, 1H/1C: Oil Furnace 3.1 Hot Water Boiler, Heat Only 3.2 Hot Water Heat with Power Open/ Power Closed, Series 20 Zone Valve 4 2H/1C: Heat Pump with Electric Aux Heat 5 References: Honeywell Home T4 […], Honeywell Home TH1110DH1003 - PRO 1000 Horizontal Non-Programmable Thermostats (1 Heat/1 Cool)- Overview: The PRO non-programmable family of thermostats provides basic and simple operation with specific models for conventional and heat pump systems. Features: Non-programmable digital thermostat. Easy-to-read backlit display - easy to read in various lighting conditions., 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 ..., Just purchased a honeywell rth6350/rth6450 thermostat to replace my old one. The wiring on the old one was as follows: R - red G - green Y - yellow W2- white X - black (1) E - black (2) O - blue orang …, 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 ..., A programmable thermostat saves energy by automatically raising and lowering the temperature of your home while you’re away. Watch this video to learn more. Expert Advice On Improv..., How to unlock a Honeywell pro series thermostat that's locked. TH6220u2000. We tried resetting it with changing the - Answered by a verified HVAC Technician, Follow in these steps. Step 1. Go to the thermostat configuration and enter the correct system type and change the reversing valve setting. Step 2. Remove the thermostat cover from the wall and don't forget to take a snap of the current wiring (you may need to restore your wiring to the current one.) Step 3., If your Honeywell thermostat won't stop flashing 'Cool On', follow these steps to troubleshoot: Reset the Thermostat: First, try resetting the thermostat. This can often resolve any minor technical glitches. Check the Wiring: Check the wiring between the thermostat and your HVAC system for any visible damage., 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., 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 an x. ... When Cool on is flashing, it means the command was sent to start the AC unit, it is just the delay for it to kick in. Once it stops ...