Honeywell pro series thermostat cool on flashing

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. 1. Reply. Pinkskippy.

Honeywell pro series thermostat cool on flashing. On the upper right it saying Cool On. Contractor's Assistant: Do you know the model of your Honeywell thermostat? How old is it? I don't know the model. The house is two years old. Contractor's Assistant: The HVAC Technician can help you find the model number for your thermostat; I'll connect you shortly. How long has this been going on with ...

Mar 16, 2023 · 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 Home TH6210U2001 - T6 Pro Programmable Thermostat, 2H/1C Heat Pump, 1H/1C Conventional- The T Series programmable thermostat streamlines everything from product selection and installation to customer service and support. With a standard footprint and simple interface, the T Series will enhance the entire thermostat experience for you and your customers alike<br> <br><b>Package ...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.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...This 7-Day Programmable Honeywell Home Thermostat is easy to install and operate, ... Our Accessibility Statement. Beat the heat and save this season on a smart home thermostat. Search Button Find a Pro. Toggle navigation Home Products ... T6 Pro Smart Thermostat Support; T5/T5+ Smart Thermostat Support;

View and Download Honeywell PRO TH3000 Series operating manual online. ... (Heat/Cool) PRO TH3110D / TH3210D System switch The SYSTEM switch can be set to control your heating or cooling system, depending on the season. ... Install fresh batteries when the REPLACE BATT warning begins flashing. The Turn thermostat over, insert fresh AA warning ...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.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.2/25/22. To Set your schedule: Touch MENU on the thermostat display, select SCHEDULE. Each Day / Period will be displayed. Touch SELECT to edit each period. Touch the TIME displayed and use the +/ - icons to adjust the start time for the desired period (adjustable in 15-minute increments). Touch the TEMPERATURE displayed to adjust the desired ...Step 1: Check your Honeywell thermostat's mode. In some cases, your thermostat can switch to the "Setup Mode", especially if there has been a recent power cut in your area. Check the settings to make sure your thermostat is in the correct mode. Moreover, you should also ensure that the correct time is set on the device.

Connected to your existing WiFi, the T6 Pro Smart Thermostat is already part of the family. Integration with your Apple Home and Amazon Echo lets you adjust your temperatures as easily as you change songs on your playlist. This smart home thermostat also works with your heating system's stages, up to 3 Heat/2 Cool with a heat pump.Here's an easy four step process to resetting your thermostat after a power outage. 1. Turn off your thermostat. Before doing any other troubleshooting, start by finding your thermostat and turning it off. You don't want your thermostat to be on and signaling the system when completing the later steps in our process that involve electricity.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.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.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.Last updated. 2/22/22. The temporary hold setting is when you change the temperature setting to a different temperature and it stays at that setting until the next schedule change. The permanent hold setting holds the temperature setting you have chosen for an indefinite time. This overrides your scheduled settings.

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STUCK THERMOSTAT FIX RESET REPROGRAM (HONEYWELL RTH2510 / RTH2410 SERIES)Confirm the message "Cool On" is solid (not flashing) on the thermostat display. Confirm your wiring is correct, and the wires have good contact in the terminals (tug gently on the wires) Advanced steps: Using a multimeter, measure the AC voltage between your Rc wire and your Y wire. Your thermostat operates between 20-30VAC, any reading ...A loose wire is one of the common reasons behind the Honeywell thermostat blinking the HEAT ON. When the thermostat blinks the HEAT ON, your device is in a 5-minute delay to give you heat. But more than 5 minutes is abnormal. The device increases the delay when the wires are loose and fail to signal your HVAC properly.Keep the home energy efficient with the FocusPRO® 6000 Programmable Wireless Thermostat. This thermostat is wireless to an equipment Interface module or to a RedLINK® zone panel when used with the wireless adaptor. Add a RedLINK® gateway for Access through the TCC app or website so you can monitor and control your heating and …When COOL ON blinks, it usually indicates a cooling system delay. But when it flashes for over 5 minutes, the primary reasons are power outage, sensor issues, wrong thermostat settings, low batteries, dirty filters and coils, wire problems, and wrong mode selections. If you have ever faced a problem and are searching for solutions, this is the ...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 ...

Feb 22, 2022 · 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.Sep 19, 2023 · When COOL ON blinks, it usually indicates a cooling system delay. But when it flashes for over 5 minutes, the primary reasons are power outage, sensor issues, wrong thermostat settings, low batteries, dirty filters and coils, wire problems, and wrong mode selections. If you have ever faced a problem and are searching for solutions, this is the ...If the flashing light on your Honeywell thermostat has been on for more than 5 minutes and there is no cooling,. In such a case, resetting the thermostat may resolve the problem. In this blog, we are going to outline the many measures you may take to address the difficulties with ‘Cool On’ on your Honeywell thermostat.T1 Pro. Non-Programmable Thermostat. User Guide. Package Includes: • T1 Pro Thermostat • UWP™ Mounting System • Honeywell Standard Installation Adapter (J-box adapter) • Honeywell Decorative Cover Plate - Small; size 4-49/64 in x 4-49/64 in x 11/32 in (121 mm x 121 mm x 9 mm) • Screws and anchors • 2 AA Batteries ...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.Oct 4, 2021 · The blinking “Cool On” message on a Honeywell thermostat display indicates that the system is restarting, batteries need replacing in the control panel, or a fault with the system. If the blinking persists for more than five minutes, contact a technician to perform diagnostics. The “Cool On” indicator message on a Honeywell thermostat ...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.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.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 moreStep 3: Reset the Thermostat. If the thermostat is still not turning on, perform a factory reset. This can resolve any software issues that may be causing the problem. Note: Performing a factory reset will erase all settings and restore the thermostat to its default state.

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 …

My Honeywell Home Pro Series thermostat is offline and there is no display. I have two thermostats and the other one is working fine. ... Cool on is flashing in top left corner. 2. A triangle is light in middle of top of display. ... We just installed a Honeywell Pro TH8000 thermostat and it is blowing hot air when it is set to cool ...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.Jan 16, 2022 · 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.Start from the main screen of the Honeywell Home T6 Pro Smart Z-Wave Thermostat. Press the Menu button at the bottom of the screen. Then scroll right or left until you find the Z-Wave Setup option. Press the Select button to continue. Then find the option that asks the user to "put the controller into its pairing mode".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 ...Low 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.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...Recommended Fix. 1. Honeywell AC Won't Work. The wrong setting, dirty condenser coils, or a non-running fan. Set the thermostat on COOL, lower the temperature below room temperature, and set the fan on ON/Auto mode. Clean dirty coils and ensure the fan is running. 2. Honeywell Air Conditioner Not Blowing Cold Air.1. Wait 5-10 minutes. Your thermostat could be facing a slight delay in restarting and activating its compressor protection feature. Make sure to wait at least 5 minutes before further troubleshooting. I recommend waiting for a solid 10 minutes so you can confidently rule out the compressor protection feature. 2.

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A full WiFi Reset can be performed one of two ways: When registered with the Resideo App - Login, select the thermostat, then select the settings icon in the top-right corner. The "Reset WiFi" option is located at the bottom of the screen. Follow the prompts in the app to reconnect, or to connect your thermostat to another WiFi signal.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.I have a Honeywell home pro series, the cool on is flashing but the ac will not come on. ... 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.Jan 11, 2024 · The Honeywell AC thermostat cool on blinking issue can be resolved through a series of troubleshooting steps. Start by inspecting the thermostat wiring for any potential issues. Start by inspecting the thermostat wiring for any potential issues.Setting the fan 1 Touch to display fan settings. 2 Touch On, Auto, Circ, or Follow Schedule. MCR34096 Done 3 Touch to save and exit. On: Fan is always on. Auto Circ Auto: Fan runs only when the heating or cooling system is on. Circ: Fan runs randomly about 35% of MCR34097 the time (residential use only).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 simple ...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.The Honeywell digital thermostat is a popular choice for homeowners looking to efficiently control the temperature in their homes. However, understanding how to properly operate an... ….

All Honeywell thermostats, no matter the type of model, have a symbol showing you when the air conditioning is turned on. It can be a snowflake or it may say "cool on.". When the air conditioner is actually running it will be a steady symbol, but you may notice it flashing at times. This indicates that your HVAC system is in a delay mode.Aug 3, 2020 · 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.T10 Pro Smart Thermostat with RedLINK® includes room sensor. SKU: THX321WFS2001W/U. Sense the temperatures and humidity in the places that matter most with the T10+ Pro Smart Thermostat. Focus on the rooms you choose by adding Smart Room Sensors and setting a schedule, or let the sensors respond to your lifestyle. Utility …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 ...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 ...Honeywell/pro series Th4110u2005 is not working. It was fine and then my husband who has very limited sight tried to increase the temp. He touched a button and now the face of the screen in the upper …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 ConfiguredIf you have a Honeywell Pro Series thermostat, you may have noticed that the "cool on" indicator is blinking. This is normal behavior and indicates that the thermostat is in cooling mode. The reason the light blinks is because the thermostat is constantly making minor adjustments to maintain the set temperature. Honeywell Thermostat Cool on ...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... Honeywell pro series thermostat cool on flashing, Press the Menu button and keep pressing until you see ALRT on the screen. 2. Press Select to check what alerts are there. 3. If you see the message REPL (REPLACE AIR FILTER), it means you need to change the air filter. 4. To reset or clear this message, press Select and go to CLER (Clear). 5. Press Select again to remove the air filter reminder., Cooling Off: Setting Your Honeywell Thermostat to Cool • Cooling Off • Learn how to easily set your Honeywell thermostat to cool and get your space comfortab..., PRO 1000 Series Non Programmable Thermostat 69-2607EFS-06 Heat Off Cool Auto On Fan ... When "Heat On" or "Cool On" is flashing, compressor protection is engaged (see page 8). Setpoint indicator ... The Honeywell Home trademark is used under license from Honeywell International, Inc. This product is manufactured by Resideo Technologies ..., 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 ... The thermostat is showing a flashing year date and a low battery condition on my Honeywell thermostat and the air conditioning of course has stopped ... fan on and off for cool or ..., 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 ..., 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., Dying batteries could prevent your Honeywell thermostat from turning on heat. If your thermostat is not flashing any ‘heat on’ messages or icons, the problem of your thermostat not turning on heat could be with dying batteries. Another issue that could help you tell if batteries are flat is a faint display on your thermostat., 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., 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., Wait at least 10 seconds and put the batteries inside the thermostat device in correct order. No need to push any button or do anything to reset the device. Turning it on after changing the batteries will bring it to the default setting. Once you reset the device, it will fix the “cool on” issue as well., Leave the unit for a while and check whether the system is going to start cooling or not. Check other thermostat settings – something might have made your thermostat switch back to setup mode. Also, check the time on the device, as wrong settings can make the ‘cool on’ indicator start blinking. Replace the batteries or check the wiring ..., Reasons a Honeywell thermostat keeps rebooting. Replace dead batteries, tighten loose wiring, or replace a failing transformer. Check installation and wiring, replace damaged wiring. Replace faulty high limit switch. Update the thermostat's software. Replace faulty sensor or relay., Jan 1, 2024 · Check 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., Select "Schedule Reset". PERFORMING A HOMEKIT RESET. Press the Menu Icon. 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 "HomeKit"., Nov 12, 2019 · Honeywell thermostat says "cool on" blinking or "heat on" flashing, but not working after changing batteries. Thermostat blinks Cool On or Heat On is a safet..., 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., The compressor protection will not turn off on my honeywell fous pro th6000 series thermostat - Answered by a verified HVAC Technician. ... Hello, the cool on is still flashing on our ac after my husband vacuumed it out , we replaced the batteries and rest the Honeywell pro., 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., The Honeywell 8000 thermostat is a popular choice for homeowners looking to upgrade their heating and cooling systems. With its sleek design and advanced features, this thermostat ..., 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..., 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 Cool)., On the upper right it saying Cool On. Contractor's Assistant: Do you know the model of your Honeywell thermostat? How old is it? I don't know the model. The house is two years old. Contractor's Assistant: The HVAC Technician can help you find the model number for your thermostat; I'll connect you shortly. How long has this been going on with ..., 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., With the WiFi 9000 Color Touchscreen Thermostat, you gain access to a programmable mode, allowing you to adjust the temperature to a level that promotes saving on annual utility expenses. Additionally, you have the option to enroll in our Energy Savings Program, enhancing your energy efficiency even further. Personalized Comfort and Style., 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., Return mode starts flashing whenever the Honeywell thermostat is preparing in advance for the "Return" or "Home" schedule periods. ... PRO 4000 and RTH 2300 Series. Programmable thermostats. Schedule Mode: 5+2; ... 10 Steps to Fix a Honeywell Thermostat Flashing Cool On or Heat On. Disclaimer: You are responsible for your own safety. ..., 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, 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., Press the Menu button and keep pressing until you see ALRT on the screen. 2. Press Select to check what alerts are there. 3. If you see the message REPL (REPLACE AIR FILTER), it means you need to change the air filter. 4. To reset or clear this message, press Select and go to CLER (Clear). 5. Press Select again to remove the air filter reminder., Honeywell thermostat says "cool on" blinking or "heat on" flashing, but not working after changing batteries. Thermostat blinks Cool On or Heat On is a safet..., T6 PRO PROGRAMMABLE THERMOSTAT Manual & Support. TH6320U2008/U, TH6220U2000/U, TH6210U2001/U. Download Manual Download Installation Guide. Download Service Datasheet., Apr 4, 2023 · If your thermostat has been flashing “cool on” for several minutes and no cool air is coming out, check your thermostat’s settings. A recent power outage could have triggered the thermostat’s “set-up mode,” explaining the blinking message. If it is in set-up mode, change it back to the correct setting. You can go through the ..., Step 2 – Check to See if the Thermostat or the Clock are Set. Your thermostat could go into setup mode if you had a recent power outage or no power for a while. This can cause the “cool on” indicator to keep blinking. So, if you did have a power outage, the first thing to do is check your settings.