Honeywell pro series thermostat cool on flashing

Solve The Honeywell Thermostat Flashing Problem. Before you start with some other method, you should wait for around 5 minutes. Sometimes "Cool On" icon on your Honeywell thermostat is displayed due to a timeout feature in A/C unit.That way your compressor is protected. The pressure difference can sometimes damage the compressor.Such damages are very expensive, so you should take good care ...

Amazon held an event this morning, and wow-oh-wow did they announce a lot. Smart thermostats! Flying security cameras! Robot companions! Didn’t tune in or have time to catch it all...If your thermostat won't go above 70, it's likely because the maximum temperature setting is configured to 70, or there is an active temperature limiter enabled on your thermostat. To address these issues, go to advanced setup settings and adjust the maximum temperature setting or deactivate any active temperature limiter .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.Summary of Contents for Honeywell Home T3 Pro. Page 1 Heat On User Guide Menu Package Includes: Fan Auto • T3 Pro Thermostat • UWP™ Mounting System • Decorative Cover Plate - Small; Size 4.72" H X 5.9" W (120 mm H X 150 mm W) • Screws and Anchors TH3110U2008, •...Keep in mind that the restart process may slightly differ between various thermostat models. If you want to find the exact steps for your specific Honeywell thermostat, don't forget to refer to our list of collated Honeywell user manuals. Step 3: Reset Wi-Fi Settings on the Thermostat. Try resetting the Wi-Fi settings on your thermostat.

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 ...® TH6000 Series 3 69-1921EFS—01 About your new thermostat ENGLISH This thermostat is ready to go! Your new thermostat is pre-programmed and ready to go. All you have to do is set the time and day. Then check the settings below and change if needed: 1. Set time and day (required for proper operation).....See page 6 2.Your thermostat is blinking heat on signal because there might be a problem in the outdoor unit. Moreover, a time delay problem might give blinking signals. Besides, low battery or power loss problems might show blinking results. You can replace the battery or reset it to solve the problem.PRO 4000 Series Programmable Digital Thermostat User Guide Read and save these instructions. Your new thermostat is pre-programmed. Just set the time and day. For help please visit yourhome.honeywell.com Press to set desired temperature. Note: Set SYSTEM switch to the system you want to control (Heat or Cool). Fan Switch is used to control your ...Here's how to replace the batter in a Honeywell T4 Pro Programmable thermostat.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.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...

Unlike some models before, the 9000 series of Honeywell thermostats have a shorter reset route. Here’s how you reset the Honeywell 9000 Wi-Fi thermostat: 1. Press Menu. 2. Scroll to Preferences. 3. Scroll to Restore to Factory Default. 4. Confirm Yes. This will work on your Honeywell RTH9585WF thermostat. Reset Honeywell T …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 ...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 ...Sometimes, a simple reset of the power source can clear up the cool on blinking on thermostat issue. Reset the Thermostat Many minor glitches can be resolved by resetting your thermostat. This can be a soft reset or, in some cases, a hard reset as specified in your Honeywell thermostat manual. Inspect the Air Filters A very common issue that ...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.After that, return to the Menu and pick "Installer Options". Then, input your password/date code. Pick "Installer Setup". After that, follow the prompts to select pick the available options and customize as desired. Finding the password and accessing the installer setup in a Honeywell 8000 series thermostat.

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Turn off the Thermostat: Locate the thermostat's power switch or circuit breaker in your electrical panel. Turn off the power to the thermostat. Wait for a Few Minutes: Leave it off for about five minutes to allow any residual power to dissipate.; Turn the Thermostat Back On: Restore power to the thermostat by flipping the switch or circuit breaker back on.I have a Honeywell Vision Pro TH8000 Series thermostat that is working, buttons respond, but it's not engaging a temperature change. Right now my thermostat is set at 76 and the room is 80 and has bee …The new Honeywell T Series Programmable Thermostat has stages up to 2 Heat/2 Cool for conventional systems and 2 Heat/1 Cool for heat pumps.Features7-day, 5-2, 5-1-1 or non-programmableOn-screen menus with familiar installersetup (ISU) stepsUWP mounting s.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 ...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.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 ...

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). Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor (see page page 5). temperature (see page 1).Honeywell® T6 Pro Programmable Thermostat ^ White ^ 4.06W x 4.06"H ^ Two Stage Heat/One Stage Cool ^ Flexible Programming (7, 5-2, 5-1-1, 1, Off) ^ Interview Based Installer Setup Through App ^ Large Touchscreen Display ^ Adaptive Intelligent Recovery ^ Uses The UWP Mounting System That's Standard Across All T Series Thermostats ^ Easy Upsell To A Connected Lyric T6 Pro Wi-Fi When Your ...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 message when a delay occurs. This delay can be up to five minutes under normal operating conditions.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.In this video, we will walk you through troubleshooting a Honeywell thermostat with a blinking "Cool On" message. If you're having issues with your thermosta...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.Try Resetting the Thermostat to Factory Settings. 1. Honeywell Lyric Y Family. You must press the reset button and wait for 5-10 seconds, later release the button. 2. Honeywell 4000/6000/8000. Press and hold the “Reset” button for 5-10 seconds. Release the “Reset” button. 3.1-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

On my Honeywell Home Pro Series thermostat there 3 things going on. 1. Cool on is flashing in top left corner. 2. A triangle is light in middle of top of display. 3. Top right corner by Wi-fi there is … read more

1.6K. 150K views 4 years ago. Honeywell thermostat says "cool on" blinking or "heat on" flashing, but not working after changing batteries. Thermostat …Solve The Honeywell Thermostat Flashing Problem. Before you start with some other method, you should wait for around 5 minutes. Sometimes "Cool On" icon on your Honeywell thermostat is displayed due to a timeout feature in A/C unit.That way your compressor is protected. The pressure difference can sometimes damage the compressor.Such damages are very expensive, so you should take good care ...69-1969EFS—09 - PRO 2000 Series. OPERATING MANUAL. 69-1969EFS-09. 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 model number.) CAUTION.Honeywell Home TH3210U2004 - T3 Pro Non-Programmable Thermostat (2H/1C)- The PRO series provides non-programmable thermostats for 24 Vac conventional and heat pump systems or 750 mV heating systems. Features Footprint covers the same space on the wall as the legacy PRO 3000 model. UWP: Uses the same wall plate system as the rest of the T Series portfolio.Contents hide 1 Honeywell T1 Pro Non-Programmable Thermostat 2 Package Includes 2.1 Thermostat controls 2.2 Customer Assistance 3 System operation settings 3.1 Fan operation settings 4 Setting degrees Fahrenheit (F) or Celsius (C) 4.1 Built-in compressor protection 4.2 Battery replacement 5 Troubleshooting 6 5-year limited warranty 7 REFERENCE: Honeywell T1 Pro Non-Programmable Thermostat ...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.A Honeywell thermostat not working after battery change could be caused by misplaced batteries, programming that has been reset or a faulty thermostat. Fixing this problem may include checking if batteries were placed according to their respective terminals or reprogramming your thermostat. In the following chart lets take a quick look at what ...Cool on is flashing on my Honeywell thermostat - Answered by a verified HVAC Technician. We use cookies to give you the best possible experience on our website. ... We noticed that our A/C wasn't working and checked our Honeywell Pro Series model TH411OU2005 Thermostat. The Cool On was flashing and didn't stop flashing.Honeywell Thermostats. If you have a blinking or flashing snowflake on your Honeywell thermostat, or the word heat/cool is blinking, it means your thermostat is in delay mode. Your system should cycle on in five minutes but check the possible causes above for delay mode. Check for possible causes if your thermostat is in delay mode.To factory reset this thermostat, first press the System button. Now you must press and hold the blank box that's in the center of the screen. When the number panel is displayed, set the number on the left to 0710 and the number on the right to one. Once this is done, press the Done button.

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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.Check the batteries and replace them if needed. 2. Reset the circuit breaker. 3. Ensure all panel doors on the indoor unit are closed. 4. Make sure the power switch for the heating/cooling system is on. 5. Check the thermostat’s wiring for any loose connections or damage.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.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.My honeywell pro series thermostat is working incorrectly. Model #TH1110D2009. Someone pushed the middle button, menu - Answered by a verified HVAC Technician. ... The cool on is flashing there is a 100 where the room temperature setting woul ...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 thermostatCool on flashing is usually a time delay before starting the compressor. Yup, it stops flashing once time delay is over and unit is running. Turn the unit off, hose the coil of the outdoor then turn it back on. If it still doesn't work call a technician. Listen to this guy.Pro T701 Thermostat Flashing Cool on . If your Pro T701 thermostat is flashing “COOL” on the display, it indicates that your AC system has been turned off. This could be because you manually switched the system off, or because something in the HVAC system is malfunctioning.® TH5000 Series 7 69-1923EFS—01 ENGLISH Press the SYSTEM button to select: • Heat: Thermostat controls only the heating system. • Cool: Thermostat controls only the cooling system. • Off: Heating and cooling systems are off. • Auto: Thermostat automatically selects heating or cooling depending on the indoor temperature.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.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 ...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 ... ….

® TH6000 Series 3 69-1921EFS—03 About your new thermostat ENGLISH This thermostat is ready to go! Your new thermostat is pre-programmed and ready to go. All you have to do is set the time and day. Then check the settings below and change if needed: 1. Set time and day (required for proper operation)..... See page 6 2.Part of the Honeywell Home T Series of thermostats from Resideo, the T4 Pro Programmable Thermostat helps you manage your home heating and cooling in a simple, easy to use device. Designed to streamline everything from installation to user experience, the T4 features push button control and seven-day scheduling, including an option to set …VisionPRO® 8000 with RedLINK® Multi-stage Thermostat. SKU: TH8320R1003/U. 2.3. |. 62 Reviews. 12 out of 53 (23%) reviewers recommend this product. Write a Review. Simplify Your Whole Home Comfort. The VisionPRO® 8000 RedLINK® programmable thermostat allows homeowners to manage their entire home comfort system through one easy-to …® TH6000 Series 3 69-1921EFS—01 About your new thermostat ENGLISH This thermostat is ready to go! Your new thermostat is pre-programmed and ready to go. All you have to do is set the time and day. Then check the settings below and change if needed: 1. Set time and day (required for proper operation).....See page 6 2.Try Resetting the Thermostat to Factory Settings. 1. Honeywell Lyric Y Family. You must press the reset button and wait for 5-10 seconds, later release the button. 2. Honeywell 4000/6000/8000. Press and hold the “Reset” button for 5-10 seconds. Release the “Reset” button. 3.Potential reasons for endless Honeywell thermostat flashing include: ... Wait for blinking to cease after mode changes before expecting heating or cooling startup. ... Scenario 5: Specific Model Issues (e.g., Honeywell Pro Series) Honeywell’s Pro Series and other specialized thermostat lines have unique troubleshooting considerations:The Honeywell ST9400C manual is an essential resource for anyone who owns or operates a Honeywell ST9400C programmable thermostat. This comprehensive guide will help you understand...Due to drained batteries, the heating or cooling feature of thermostats malfunctions. Go to your thermostat’s display and see the battery level. Insert the batteries of the required voltage so that your thermostat performs well. Replacing the batteries can debug the Honeywell thermostat won’t switch to cool. 4. Honeywell pro series thermostat cool on flashing, On my Honeywell Home Pro Series thermostat there 3 things going on. 1. Cool on is flashing in top left corner. 2. A triangle is light in middle of top of display. 3. Top right corner by Wi-fi there is … read more, However, if your thermostat keeps blinking after the reset, you may have an issue like excessive defrosting or a switch in the outside unit that is stuck open. Get in touch with the pros at Metro Express Service and we'll diagnose and fix your problem quickly. Contact us online or call 972-263-2500 to schedule an appointment., 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;, 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, 4. If you installed the thermostat yourself, verify that the thermostat is correctly configured to control a heat pump. The installation instructions for your thermostat show these settings. 5. If the heat pump runs in cool mode with a call for heat, verify that the configuration setting for the changeover is set correctly for your system., A blinking snowflake on a Honeywell thermostat is mostly caused by activated delay mode or an activated saver switch (if you are subscribed to one). This issue can be fixed by simply waiting for the delay time to elapse which is typically about 5 minutes or switching the saver switch off, respectively. Also read: Honeywell thermostat blinking ..., 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..., If not using Wi-Fi you can set the time/date as follows: 1. Page 12 2. Scroll to and select "Wi-Fi" 3. Tap "Choose Network" 4. Select a network Choose Wi-Fi Network Connect to the Honeywell Home App 1. Open the Menu 2. Tap "Connect App" 3. Follow the on-screen instructions Connect 1. Select thermostat model 2., 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. ... Honeywell Pro 1000 Thermostat Troubleshooting: Quick Fixes for Optimal Performance. by Robbert J. Anderson., 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., Page 10: Thermostat Mounting. Thermostat mounting 1.Push excess wire back into the wall opening. 2. Close the UWP door. It should remain closed without bulging. 3. Align the UWP with the thermostat, and push gently until the thermostat snaps in place. 4. Turn the power on at the breaker box or switch., The Honeywell Thermostat Pro Series works well, but sometimes there can be issues. Here are some tips to help you fix them. 5.1. Wi-Fi Connection Problems. ... If your heating or cooling is not working right, ensure the thermostat has the right temperature and mode (heat or cool). Ask a professional HVAC technician for help if it still doesn ..., 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., Cool on flashing is usually a time delay before starting the compressor. Yup, it stops flashing once time delay is over and unit is running. Turn the unit off, hose the coil of the outdoor then turn it back on. If it still doesn't work call a technician. Listen to this guy., 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 ..., HONEYWELL THERMOSTAT NOT TURNING ON AC SYSTEMmerch = https://teespring.com/stores/steve-lavhttps://www.patreon.com/stevenlavimonierelavimoniere productions ..., 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 ..., 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, My honeywell pro series thermostat is working incorrectly. Model #TH1110D2009. Someone pushed the middle button, menu - Answered by a verified HVAC Technician. ... The cool on is flashing there is a 100 where the room temperature setting woul ..., Will resetting my Honeywell thermostat fix a blank screen? • Is your Honeywell thermostat showing a blank screen? Don't worry, we've got you covered! In this..., 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., Replacing thermostat batteries Install fresh batteries when the REPLACE BATTERIES warning begins flashing. The Replace Batteries warning flashes about 60 days before …, 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., 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..., 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 ..., 10 DIY Ways to Fix Honeywell Thermostat Cool On Blinking. Here are 10 common troubleshooting tips to stop your Honeywell thermostat from blinking Cool On: 1. Wait 10 Minutes; As mentioned if the blinking Cool On goes away after 5-10 minutes, the system likely just needed time to start up and begin cooling your home., When the power goes out on your thermostat. This usually happens when your drain line backs up and the drain switch turns off the system. You could have dead..., 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., 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..., 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., 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 ..., 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., The COOL ON, HEAT ON or icon will display when the COOL, HEAT, or (fan) is on. Note: The Compressor delay feature is active if these are flashing. 1 2 3 7 Low Battery Indicator: Replace batteries when this indicator is shown. Button Options Program Time Periods: This thermostat has 4 programmable time periods per day. 2 2 1 8 3 LOW