Honeywell thermostat pro series cool on flashing

The blinking "Cool On" means the cool cycle is in delay (5 minute by default). If it's continually blinking then either the thermostat is bad, or there's a short in the low voltage wiring that's causing it to reset everytime it tries to come back on (basically resetting itself over and over). 2. Reply. Effective-Brush9301.

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.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 ...4 Manual Troubleshooting Techniques. 4.1 Step-by-step Guide For Manual Troubleshooting Of The Honeywell Hz311 System. 4.2 Identifying And Fixing Issues With The Reversing Valve. 4.3 Switching The System To Cooling Mode And Resolving Any Related Problems. 4.4 Fixing The Bypass In The Hz311 System.Honeywell Home PRO 1000 Series lets you control your home's heating and cooling system, giving you precise temperature management. It features an easy-to-read display, user-friendly interface, and a built-in compressor protection to prevent damage from rapid restarts. With its multiple system compatibility, you can use it for 1-heat, 1-heat/1 ...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 ...In a nutshell, the Honeywell thermostat cool-on blinking issue can be resolved with some simple troubleshooting steps. By following the tips provided in this blog, you can quickly get your thermostat back on track. Remember to routinely maintain and check your thermostat to prevent future issues and ensure a comfortable indoor environment for ...May 28, 2023 · Blinking “cool on” and no cold air being. 2 year old house, Pro series. Just today. 80 in the house. Replaced - Answered by a verified HVAC Technician 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.

6 Time starts blinking. Press or to adjust the schedule period start time. Press Select. 7 Temperature starts blinking. Press or to adjust the "Heat" setpoint temperature. Press Select. Press or to adjust the "Cool" temperature setpoint. Press Select. 8 Repeat steps 4 through 7 for the remaining schedule periods.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 moreWiFi Thermostats. With WiFi Thermostats like our Honeywell Home T9 Smart Thermostat, we bring you helpful, connected products so you can enjoy optimal comfort in your home. Shop online or connect with a Pro for consultation and installation to help manage energy costs while maintaining a comfortable temperature. Home. Shop All …What I see: This stock responds well to economic recovery....AAPL Lucky break. I touched on this in my Market Recon column this morning. I got lucky. Last week. I mean it makes sen...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.

During the brief wait period, the thermostat will flash Cool On (or Heat On if you have a heat pump) until the wait period is over, at which point the compressor will turn back on. Note: The flashing Cool On or Heat On message is also used for startup delay protection if AC power loss occurs. Without wishing to be too rude, many manuals for ...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 ...2/22/22. From home screen, press MENU button. Then press "+" until "prog" is displayed on the screen. Then press SELECT to edit the program. If you don't see the program option when following these steps, the thermostat may have been configured as non-programmable by the installer. Check ISU 120 shown on page 8 of the quick install guide. 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. 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.

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The TH6320WF2003 model – This model works well with 2 cooling stages and 3 heating stages. This thermostat is specially designed for heat pumps. The TH6220WF2006 – This model works very well with standard systems that use furnace heat as well as a central air conditioner. It manages both stages.From https://www.justanswer.com/ythiJustAnswer Customer: I have a VisionPro th8000 series thermostat.JustAnswer Customer: A red light is flashing on the uppe...STUCK THERMOSTAT FIX RESET REPROGRAM (HONEYWELL RTH2510 / RTH2410 SERIES)POPULAR VIDEOS. How to Install A Honeywell Home T3, T4, T5, T6, and T9 Thermostat (Video) Modal 1. How to set up your Honeywell Home T5 or T6 Pro Thermostat. Modal 1. How to program schedules on the T6 Pro thermostat. Modal 1. How to enter and navigate advanced programming on the T6 Pro thermostat. Modal 1.2/22/22. From home screen, press MENU button. Then press "+" until "prog" is displayed on the screen. Then press SELECT to edit the program. If you don't see the program option when following these steps, the thermostat may have been configured as non-programmable by the installer. Check ISU 120 shown on page 8 of the quick install guide.1-48 of 129 results for "Honeywell Pro Series Thermostat" Results. Check each product page for other buying options. Honeywell. TH4110U2005/U T4 Pro Program Mable Thermostat, White. ... TH6220U2000/U T6 Pro Programmable Thermostat, 2 Heat / 1 Cool Heat Pump Or 2 Heat / 2 Cool Conventional, 2.27" x 6" x 5", White, Model:ITBD-3570150. 4.2 out of ...

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 ...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.Things You Will Need. Put new batteries in your Honeywell 5000 thermostat. The thermostat takes 2 AAA batteries. Press the bottom right button once to turn on the backlight of the thermostat. Press the bottom right switch under "System" to select the heat mode. Set the temperature you desire your heat to be set at by pressing the up or down ...If your Honeywell thermostat isn't displaying the cool option, it might be because you lack a cooling system like an air conditioner or a heat pump. Ensure you have an air conditioner installed. To troubleshoot, attempt setting your thermostat to defrost and observe if the condenser unit engages. If the outside condenser unit doesn't ...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.Honeywell thermostats are known for their reliability and user-friendly design. However, like any electronic device, they can sometimes encounter issues that require troubleshootin...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.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 SupportDownload this manual. PRO 2000 Series. PROGRAMMABLE THERMOSTATS. TH2110DV1008, TH2210DV1006. THIS MANUAL COVERS THE. FOLLOWING MODELS: TH2110D: For 1-Heat / 1-Cool systems. TH2210D: For 2-Heat / 1-Cool heat pump systems. (Remove the thermostat from its wallplate to find the.

You need to first identify whether the COOL feature is working or not. To do so, set the fan switch to auto and the switch at the top of your thermostat to COOL. Turn the dial to the lowest setting like 60℉ and wait for 5 minutes. If the air conditioner unit kicks in, the COOL feature is functioning right.

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. View and Download Honeywell Home T4 Pro Series manual online. Programmable Thermostat. T4 Pro Series thermostat pdf manual download. Also for: Th4110u2005, Th4210u2002. ... Wiring diagrams 1 Stage Heat Only: Gas or Oil Furnace 1 Stage Cool Only COMPATIBLE MODELS: COMPATIBLE MODELS: TH4110U2005 TH4110U2005 …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.Honeywell T6 Pro Installation Manual View and Read online. System operation settings. ... "Cool On" or "Heat On" is flashing. ... Honeywell TH3110D1008, TH3210D1004, PRO 3000 Series - Non-Programmable Digital Thermostat Manual (article) Honeywell VisionPRO TH8000 - Touchscreen Programmable Thermostat Operating ManualSummary 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 controls •...Download this manual. PRO 2000 Series. PROGRAMMABLE THERMOSTATS. TH2110DV1008, TH2210DV1006. THIS MANUAL COVERS THE. FOLLOWING MODELS: TH2110D: For 1-Heat / 1-Cool systems. TH2210D: For 2-Heat / 1-Cool heat pump systems. (Remove the thermostat from its wallplate to find the.Turn off your Honeywell Thermostat switch. Open the battery slot by pressing the door down and sliding it out. If this doesn't work, try inserting a coin or some similar object in the slot. Once you have opened the battery slot, slide the batteries out. Re-insert the batteries, but put them in a reversed position.If you're experienced aforementioned Honeywell thermostats cool on flashing problem, there were some troubleshooting steps that can help. Read this blog post used view info. ... If you're experiencing the Honeywell thermostat cool on flashing problem, there are einigen troubleshooting steps such can helped. Read this blog post for more info ...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 on, new batteries in thermostat, cleaned ac unit yesterday, today fan ...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 ...

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Honeywell YRTH series thermostat troubleshooting. Display is blank. Make sure fresh AA alkaline batteries are properly installed. Cannot change system setting to Cool. Check Function 0170: System Type to make sure it is set to match your heating and cooling equipment. Fan does not turn on when heat is required.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 ...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.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.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.If you also want to turn off recovery mode on your Honeywell thermostat, you have two options: You can override recovery mode temporarily by manually adjusting the temperature on the thermostat . This will cancel the current recovery mode and resume the normal operation of your thermostat.POPULAR VIDEOS. How to properly remove an old thermostat for replacement. Modal 1. How to Install A Honeywell Home T3, T4, T5, T6, and T9 Thermostat (Video) Modal 1. How to enter and navigate advanced programming on the T6 Pro thermostat. Modal 1. How to program schedules on the T6 Pro thermostat. Modal 1.Honeywell PRO 1000 Series User Manual View and Read online. Est. reading time 4 minutes. ... Honeywell PRO 1000 Series - Non-Programmable Thermostat Manual. Also See for PRO 1000 Series: Installation manual (21 pages) Advertisement. ... When "Heat On" or "Cool On" is flashing, compressor protection is engaged. ….

To check the underline code behind the warning sign, follow these steps below: Step 1: The alert icon appears on the Home screen. Step 2: Press Menu, and then press until the display shows ALRT. Step 3: Press ‘Select’ to display which alert (s) are present. Step 4: The message REPL (REPLACE AIR FILTER) appears.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 …This Honeywell Home Support page offers steps to bypass the schedule on your TH2210DH, TH2110DH, TH2210DV, or TH2110DV. ... T6 Pro Smart Thermostat Support; T5/T5+ Smart Thermostat Support; ... and the thermostat will be set to the temperature programmed for the current period. Also ensure that the heat - off - cool switch is set to the desired ...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.1-48 of 129 results for "Honeywell Pro Series Thermostat" Results. Check each product page for other buying options. Honeywell. TH4110U2005/U T4 Pro Program Mable Thermostat, White. ... TH6220U2000/U T6 Pro Programmable Thermostat, 2 Heat / 1 Cool Heat Pump Or 2 Heat / 2 Cool Conventional, 2.27" x 6" x 5", White, Model:ITBD-3570150. 4.2 out of ...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.POPULAR VIDEOS. How to Install A Honeywell Home T3, T4, T5, T6, and T9 Thermostat (Video) Modal 1. How to set up your Honeywell Home T5 or T6 Pro Thermostat. Modal 1. How to program schedules on the T6 Pro thermostat. Modal 1. How to enter and navigate advanced programming on the T6 Pro thermostat. Modal 1.1-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 SupportConfirm 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 … Honeywell thermostat pro series cool on flashing, 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 ..., Is your thermostat repeatedly resetting, even when you haven’t touched it or adjusted the settings? In this case, the thermostat may be on hold. Expert Advice On Improving Your Hom..., This Honeywell Home Support page offers steps to bypass the schedule on your TH2210DH, TH2110DH, TH2210DV, or TH2110DV. ... T6 Pro Smart Thermostat Support; T5/T5+ Smart Thermostat Support; ... and the thermostat will be set to the temperature programmed for the current period. Also ensure that the heat - off - cool switch is set to the desired ..., 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., If it is enabled, just press the 'disable recovery mode' option. 2. Monitor the results. Give your Honeywell thermostat around a day to see if the recovery mode turns on. Likely, this should not worry you. If that period of the day ends and the thermostat switches into recovery mode, there is something wrong. 3., View Resource: PRO 4000 Series Programmable Digital Thermostat Installation Instructions (English, French, Spanish) - Legacy Product Document TH4000 Series Programmable Thermostat Operating Manual (English, French), 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., Best honeywell pro series thermostat wifi reviews 2023Honeywell thermostat battery replacement if thermostat doesn't work ac won't turn on How to reset honeywell thermostat th4110d1007Honeywell thermostat programmable. ... 2000 vertical programmable thermostats 1 heat / 1 cool Honeywell thermostat programmable review edited lastHoneywell pro ..., Whether it's an older analog model or one of the newer Wi-Fi-enabled smart Honeywell pro series with internet connectivity and remote access capabilities, many common Honeywell thermostat problems can be fixed with some easy DIY troubleshooting. In ... Related Article: Honeywell Thermostat Cool on Blinking. Rate this post., STUCK THERMOSTAT FIX RESET REPROGRAM (HONEYWELL RTH2510 / RTH2410 SERIES), 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 ..., It's brand new pro series. Contractor's Assistant: How long has this been going on with your Honeywell thermostat? What have you tried so far? We just moved in last night so, 12 hours. I hit the menu button and it took me thru heat cool, etc and when I hit the down button it won't go lower than 72 on temp. It's set on cool, Honeywell TH3110D1008, TH3210D1004, PRO 3000 Series - Non-Programmable Digital Thermostat Manual. Also See for TH3110D1008: ... "Cool On" or "Heat On" is flashing: ... Honeywell T10 PRO Smart Thermostat Installation Guide (article) Honeywell Programmable Thermostat RTH6350 Manual, If your Honeywell thermostat displays the "Waiting for Update" message, there are a few things you can do: Be Patient: Depending on the size of the update and your Wi-Fi connection speed, the process may take some time. Avoid interrupting the update, as doing so could lead to complications. Ensure a Stable Connection: Make sure your ..., 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 ..., 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, Table of the default schedule on a Honeywell 8000 series thermostat. As you can see in the graphic above, the Return/Home period is set to 6.00 P.M. the time when most homeowners return after work. Also, the “Away” temperatures are decreased/increased to minimize power consumption by your AC or Heat Pump/furnace. Customizing Your Schedule, Feb 13, 2021 · My thermostat is TH411OU2005. Honeywell home pro series. i think it is programable. i just want to set the temperature, but i can't because it keeps talking about time and fans and other stuff. can yo … read more , RECONNECTING A THERMOSTAT TO A WIFI NETWORK. If your device was previously connected, please remove the face plate from the wall plate for 30 seconds and then reconnect it. After. 2 minutes, check the following: WiFi Icon is present. Look for it in the top right or top left corners of the thermostat display. If the icon is present and does not ..., If you need to reset your Honeywell Pro Series thermostat, the process is simple. First, locate the Reset button on the thermostat’s control panel. It should be located near the bottom of the device and may have a “Reset” label above or below it. Once you’ve located it, press and hold down for 10 seconds until all settings are restored ..., Honeywell Pro Series. About a year old, Front cover says "Honeywell - Answered by a verified HVAC Technician ... I am trying to switch from heat to cool. it doesn't do anything. there is a lock symbol at the bottom. I pushed that and got a request for a pin. ... display says unlock at the bottom of the display — it's a pro series Honeywell ..., Heath : To get into the menu press and holf the up arrow and the fan button untill the display changes. Then press the next button until you get to option 15 and on the right side will be a 5 that is the 5 minute delay. Use the up and down arrows to change the 5 to 1 if you want the comprete.r delay to be 1 minu., thermostat program is permanently overridden. System operation indicators: The COOL, HEAT or FAN icon will display when the COOL, HEAT or FAN is on. NOTE: The compressor delay feature is active if these icons are flashing. The compressor will not turn on until the 5 minute delay has elapsed. Days of the week and time Button options, If you are using a Honeywell Pro series, follow these steps: When a menu pops up, press the next button until you see the 'Set' upper limit temperature on the right side of the screen. Press next to remove the lower limit, and your set lower limit should display. In this case, you should see 68., Resetting your T5 Thermostat is an easy process that can be done in a few simple steps. First, locate the reset button on the thermostat. This will usually be located near the face of the thermostat or somewhere along its sides. Once you have identified this button, press and hold it for 10 seconds until you hear a clicking sound., 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 …, 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 ..., 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., Heath : To get into the menu press and holf the up arrow and the fan button untill the display changes. Then press the next button until you get to option 15 and on the right side will be a 5 that is the 5 minute delay. Use the up and down arrows to change the 5 to 1 if you want the comprete.r delay to be 1 minu., 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 ..., The screen will wake up by pressing any of the five buttons. If powered by the C wire, the screen stays lit for 45 seconds after you complete changes. If powered by battery only, the screen stays lit for 8 seconds. Depending on how your thermostat was installed, the screen light may always be on., 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., 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