Honeywell home cool on blinking

Conclusion – Honeywell Thermostat Cool On Blinking. In most cases, a blinking “Cool On” indicator on a Honeywell thermostat simply means that there is a delay, and the system will start working normally after about 5-10 minutes. If the problem persists, try bypassing the thermostat or troubleshooting the system further.

Honeywell home cool on blinking. Honeywell Home uses an algorithm that fixes deadband at 0 °F; Number: 365. Description Cool 1 CPH (Cooling cycle rate stage 1) Options (factory default in bold) 1 - 6 CPH (3 CPH) Note: This ISU is only displayed when Cool /Compressor Stages is set to 1 or more stages. Cycle rate limits the maximum number of times the system can cycle in a 1 ...

Hi, I have a multi-zone residential setup using the Honeywell Z311. When I call for the AC from the thermostat, the AC unit outside starts up and then stops after a minute or so. Sometimes shorter, sometimes longer. It's doing it on both zones. There is a flashing cool light on the honeywell z311 when this occurs. "Blinking when 45°F (7°C) DATS low limit mode has been reached."

Make sure power switch for heating & cooling system is on. Make sure furnace door is closed securely. Wait 5 minutes for the system to respond. Temperature settings do not change. If you are in the correct mode, but you cannot set the heat from 32 °F to 90 °F (0 °C to 32 °C), or set the cool from 50 °F to 99 °F (10 °C to 37 °C), you may ...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 If it is, allow the furnace to cool down and then reset the switch.If you have an older home with an outdated thermostat, you may be missing out on the many benefits that come with upgrading to a newer Honeywell thermostat. One of the key benefits...I have a Honeywell home pro series, the cool on is flashing but the ac will not come on. TH411OU2005. For the last - Answered by a verified HVAC TechnicianThanks Phil. The home is 5 years old. And I am not sure the name of the system. The red light just recently (today) started flashing on the Honeywell TH8000 thermostat. I looked at the circuit breakers - and nothing was trippedThe system, since we bought the home, as been excellent. Never a day's problem.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 …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 malfunctioning thermostat. By troubleshooting the problem step by step, you can determine the precise cause and take the appropriate action to resolve it. Reasons For The Cool On Blinking Indicator.7 Problems of Honeywell HZ311 Thermostat With Troubleshooting Guide. Problem 1: Incorrect Temperature Readings. Problem 2: Connectivity Issues. Problem 3: Unresponsive Controls. Problem 4: Heating or Cooling System Not Working. Problem 5: Display or Interface Issues. Problem 6: Short Cycling. Problem 7: Sensor Problems.

From https://www.justanswer.com/ythiJACUSTOMER-63s3by4n-: HVAC Technician: I have a honeywell pro th4000 series system.JACUSTOMER-63s3by4n-: HVAC Technician:...Smart Temperature Zoning. The TrueZONE® HZ311 Panel is for conventional, single stage applications for up to 3 zones (1H, 1C) at 24 Volts. It features robust push terminals, common-sense LEDs, variable-speed fan control, and leaves a …Shop by Popular Honeywell Humidifier Models. 2000 HCM-2020 HE220A HE220B HE225A HE225A1006. HE225B HE225B1004 HE260A HE260B HE265A HE265A1007. HE265B HE265B1005 HE360 HE365 HE365A HE365A1006. HE365B HE365B1004 HM506. View more. Ask a customer care specialist We have a trained team ready 24/7 to answer your questions and help you get back on track.The Honeywell Home thermostat in my apartment for some reason on Heat is blinking "Leave" but not turning on, I do hear a click. I temporarily put the temperature above 82 right now, and set the whole to 85 for all modes to test it. If I switch it to "On" from "Auto" it only turns on "Cool", but not on "Heat".Confirm the message "Heat 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) Check your jumper wire. To operate heating, the thermostat requires power to the R terminal. (If you have a wire in the RC terminal and no wire in the R ...Select “Reset”. 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”.Resetting a Honeywell thermostat is simple and only takes a minute or two to complete. Either refer to your Honeywell control manual to reset it or follow the guide below that outl...

Why Is My Honeywell T4 Thermostat Cool On Blinking? The Honeywell T4 thermostat’s blinking cool light might indicate a cooling issue. Conclusion. Troubleshooting the Honeywell T4 Pro thermostat can sometimes be a frustrating task. However, by following the steps outlined in this blog post, you can easily identify and fix common issues that ...When the Honeywell thermostat displays ‘Cool On’ or the snowflake icon, it indicates that the thermostat is in delay mode. This delay is activated to protect your …Note: You may need a screwdriver to release wires from terminals. E) Connect labeled wires to the C-Wire Adapter. On the C-Wire Adapter's "Thermostat" side, press down a tab to open the corresponding terminal. Insert the labeled wires to the following terminals: W-Wire --> W-Terminal. G-Wire --> C Terminal.3/02/22. Camera Base Station uses a variety of lights and sounds as a way to notify you about what's happening in and around your home. Here are some of the most common patterns: A momentary white light when the system mode has changed to HOME. A momentary green light followed by a slow, blinking green light during Entry or Exit delay — you ...

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To do this, find the various schedules on the display on your thermostat. Press the set button to get past the time and day. When you get to a scheduled time you want to cancel, press the hold button for about 5 seconds. Once the numbers on your screen changes to zero, press "Set" to lock in the changes.Turn off the power on your indoor unit for five minutes and then turn it back on if the emergency light on your thermostat continues to blink. Your unit will lock-out (shut down) during inclement weather, so turning off the power and then turning it back on may solve the blinking problem. Inspect the outdoor unit after 10 minutes to see if it's ...By the time you reach the step to pair the water leak detector with your smart phone or tablet, more than five minutes may have elapsed and the detector will have stopped blinking blue. If this happens, take out all batteries from the device, wait for one minute and re-insert the batteries. Inserting the batteries will re-trigger the Bluetooth ...If the room temperature is below the heat set point, the thermostat display should indicate a call for heat. 2. Confirm that the circuit breakers are on. 3. If you installed the thermostat yourself, ensure that the wires are matched correctly and securely connected at the thermostat. 4.After a few minutes, the thermostat will connect to phone and wi-fi. Press next. It will give you a PIN "1234". Type the PIN on your device. Next, pick a location where you install the device. Enter Home OR select appropriate. Name your thermostat (you can use the brand name such as Honeywell T6 pro etc. or customize)

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.Most Honeywell thermostats blink when in a time delay for cooling (or heating if it is a heat pump). This time delay feature protects the compressor from cranking too soon following a short off cycle or a power outage. The "cool on", "heat on", snowflake or flame icon will be blinking if this is the case. Honeywell Wireless Thermostat ...Turn off your thermostat, open the battery compartment on the front, and remove the batteries. Put the new batteries in the compartment and slide the protective plate over them. Place the thermostat back on the wall, turn it on, and check to make sure that the new batteries work. In a lot of ways, replacing the batteries on a Honeywell ...Solution: Check the filter for your air conditioner regularly. Most air filters should be replaced every six to 12 months. Check to make sure the air filter is clean and also installed correctly. If you see any potential issues, take the steps to fix them. This may mean buying a replacement air filter.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.In today’s fast-paced world, home security has become a top priority for many homeowners. With the advancements in technology, there are now numerous home monitoring systems availa...Mar 7, 2024 · The blinking cool on your Honeywell thermostat indicates a potential issue with the cooling system, such as low refrigerant or a faulty compressor. Why Is My Honeywell Thermostat Showing A Blinking Cool But No Ac? If your Honeywell thermostat is showing a blinking cool but no AC, it could be due to a problem with the cooling system’s ... 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.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.If you have a green light on your Honeywell water heater that starts blinking, there are a few possible causes. First, it could be that the pilot light is out. If this is the case, you'll need to relight it. Second, the blinking could be caused by a problem with the gas line. If you suspect this is the case, you should call a qualified ...

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...

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.Typically, you will have a Honeywell thermostat flashing heat on in delay mode, but no heat coming through. If 5 minutes pass and the flashing message doesn't go away, you might need to restart your thermostat. You can do so by flipping off the power switch for 5-10 minutes and flipping it back 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.As I wrote above, Honeywell RTH9585WF is the successor of its best-selling WiFi thermostat model Honeywell RTH9580WF (which is still available for purchase). Honeywell RTH9580WF is bulkier, and follows a conventional boxed design (not sleek, curves are not smoothed); whereas the newer model RTH9585WF is sleek, with a smooth design on the edges.Turn ON the thermostat. Press the PROGRAM button thrice. The reset button is located inside a small hole on the front panel of the thermostat and to the right of the buttons. Use a sharp object (toothpick, paperclip, or pin), put it in the hole, and press the button for about 5 seconds. Now, your thermostat has been reset.The low refrigerant level is the most common reason the Honeywell HZ311 is showing a red light. It results in the HVAC system not being able to cool the air effectively, so warm air circulates throughout your home. In this case, the compressor will continue to work non-stop, trying to cool the air to the desired temperature, which, in the end ...If you have an older home with an outdated thermostat, you may be missing out on the many benefits that come with upgrading to a newer Honeywell thermostat. One of the key benefits...Understanding the Delay and Duration of "Cool On" Blinking. When you see the Honeywell thermostat "Cool On" blinking, it indicates a delay mode. This delay is designed to protect your heating and cooling equipment from short cycling, which can cause damage. The delay can last up to five minutes under normal operating conditions.

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Why Is My Honeywell T4 Thermostat Cool On Blinking? The Honeywell T4 thermostat’s blinking cool light might indicate a cooling issue. Conclusion. Troubleshooting the Honeywell T4 Pro thermostat can sometimes be a frustrating task. However, by following the steps outlined in this blog post, you can easily identify and fix …Check the filter: A dirty or clogged filter could cause the red light to appear. Make sure to clean or replace the filter if necessary. Check the wiring: Make sure that all the wiring connections are properly connected and that there are no loose wires or damaged wires. Check the sensors: The sensors on your Honeywell HZ311 thermostat may need ...Honeywell thermostats are among the best on the market because of their user-friendly display and reliability.The display is one of the highlights of Honeywell thermostats because useful information is readily available and it's easy to use.So, what does it mean when your Honeywell thermostat is blinking "Cool On"?The "Cool On" message will appear on your Honeywell thermostat if the ...Oct 15, 2022 · Sometimes, all you would have to do to get rid of the blinking ‘cool on’ message is reset the thermostat. If your thermostat has batteries, then insert those backward for 5 seconds to reset the device. To reboot other Honeywell Pro Series thermostats, you would have to: Turn the device on. Press and hold the ‘menu’ button for 5 seconds. Oct 25, 2023 · If you have a Honeywell T5 thermostat, then you may have noticed that it appears to be flashing or blinking cool. This is actually quite common and can indicate a few different issues. First of all, the thermostat might need batteries replaced, as its low battery warning system will cause the screen to flash ‘cool’ when the power supply is ... Confirm you have a C wire in the C terminal. If your previous thermostat did not use a C wire, it's unlikely that it is connected at the equipment. Verify the C wire is connected to the C terminal in your furnace or air handler. Check your jumper selector switch. If you have a wire in the R terminal and no wire in the RC terminal, verify the ...Heat pump issues cool air in heat mode, or warm air in cool mode. Check System Setup Option 200 or 218 to make sure it is set to match your heating and cooling equipment (see pages 8 and 9). Honeywell Customer Care toll-free at 1-800-468-1502. See other models: RTH2300B1012 RTH221B1021/E1 RTH7600D RTH3100C1002/E1 RTH5100B1025/K1Do not worry. It's a much more common problem than you might think. 90% of the time, it won't be a huge problem. It's just a 'feature' of the Honeywell Thermostat. The only time you need ...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.Blink cameras are a popular choice for home security systems due to their easy installation and wireless capabilities. If you have recently purchased a Blink camera, you might be w... ….

Honeywell has made a business out of helping homes be more comfortable. Today, it is one of the leaders in providing solutions for connected homes, including delivering a variety o...Honeywell controllers are a popular choice for many businesses in Shreveport, LA. They are reliable and easy to use, making them an ideal choice for controlling temperature and hum...However, if the cooling system is not working correctly, you may see this indicator flashing. Common Causes of the "Cool On" Flashing Issue. Several factors can lead to your Honeywell thermostat flashing "Cool On." Understanding these causes is crucial in determining the appropriate solution. Here are some common reasons:View and Download Honeywell Home T3 Pro user manual online. T3 Pro thermostat pdf manual download. Also for: Th3110u2008, Th3210u2004, Th3210u2004/u, Th3110u2008/u. ... Cool On/Heat On/Em. Heat On, Compressor. Protection • Indoor. temperature. setpoint. Press + or - to change. temperature setting • Actual indoor.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.Conclusion – Honeywell Thermostat Cool On Blinking. In most cases, a blinking “Cool On” indicator on a Honeywell thermostat simply means that there is a delay, and the system will start working normally after about 5-10 minutes. If the problem persists, try bypassing the thermostat or troubleshooting the system further.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...Confirm you have a C wire in the C terminal. If your previous thermostat did not use a C wire, it's unlikely that it is connected at the equipment. Verify the C wire is connected to the C terminal in your furnace or air handler. Check your jumper selector switch. If you have a wire in the R terminal and no wire in the RC terminal, verify the ...Clear the thermostat by tapping "dismiss" after putting in a fresh filter. 188/189—Install a new UV bulb. Call Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for help. 210—Register online for outside temperature. Get the Lyric app to do this step and ensure correct thermostat operation.Ac not working, and on the thermostat in the upper right corner is is blinking cool on. - Answered by a verified HVAC Technician. We use cookies to give you the best possible experience on our website. ... We have a Honeywell home pro series model TH4210 you 2002 and we can't adjust the thermostat ... Honeywell home cool on blinking, To use this feature: 1. Press the Menu button on your thermostat. Select Schedule. Select Hold/Run Schedule. Choose between Hold Until and Hold For options by pressing the corresponding button on your thermostat screen. If you choose Hold Until, press the + or - buttons to select when you want the hold to end (for example, in 6 hours) Then ..., 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., Step 1. Change the Temperature. The first thing you can do if your thermostat display is on, but doesn't power on the HVAC system, is to adjust the temperature. So, first, try changing the temperature on your Honeywell thermostat. Also, make sure the desired temperature falls within the acceptable ranges., Don't blink. Animals come in all different shapes and sizes, but only a few can change their shapes. Researchers in Ecuador recently reported a new species of frog that can change ..., If your batteries need replacing the heat, AC and back light will not work.Here are some of the tools that Get It Done Home Repairs useshttps://www.amazon.co..., 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., To wrap it up, if you find the purge light on your Honeywell mini zone controller blinking, it indicates a potential issue with the discharge air sensor or other components of the system. Remember to ensure that the discharge air sensor is securely attached and consider replacing it if necessary. Additionally, check for any loose …, 2/22/22. If your thermostat is newly installed and the heat pump worked for cooling with the previous thermostat, check the following: 1. Verify that the thermostat is set to cool and is calling for cooling, usually indicated by the words "cool on," a snowflake icon, or a shimmering snowflake icon. If the room temperature is below the cool set ..., Honeywell thermostat blinking cool on, vwey little to no cold air coming out of vents. Contractor's Assistant: Sometimes HVAC issues that that you think will be really complicated end up being easy to fix. The HVAC Technician I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so we can help you best., Step 1: Check Temperature Differential. To begin, press the "Menu" or "Settings" button on your Honeywell thermostat. Use the arrow keys or touchscreen to navigate to the temperature setting. Ensure your desired temperature is just a short distance from the current room temperature displayed on the thermostat's screen., 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., Honeywell air conditioners are known for their high-quality, reliability, and energy efficiency. However, like any other electrical device, they may experience issues at some point. One common problem that Honeywell air conditioner users face is the blinking of the cool on light. This blinking light may indicate a problem with the device that needs to be addressed., The WiFi 7-Day Programmable Thermostat has a large easy-to-read display and can be adjusted through your smartphone or tablet for convenience. Utility Rewards Available. SELECT A MODEL: WiFi 7-Day Programmable Thermostat. $99.99. $69.99. In Stock. or 4 interest-free payments of $25.00 with. Add To Cart., Note: You may need a screwdriver to release wires from terminals. E) Connect labeled wires to the C-Wire Adapter. On the C-Wire Adapter's "Thermostat" side, press down a tab to open the corresponding terminal. Insert the labeled wires to the following terminals: W-Wire --> W-Terminal. G-Wire --> C Terminal., Professional Contractor Support. Call the Homeowner number above and select the 'Contractor' option. Open Hours: Monday through Friday: 9am - 5:30pm CDT, The Honeywell thermostat cool on blinking issue is a common problem with air conditioning systems. When the thermostat display says "Cool On," it means that the AC unit is working to pump cool air into the home. However, if the thermostat keeps blinking cool on for a long time and no cool air is felt, there may be an issue., I have a Honeywell home pro series, the cool on is flashing but the ac will not come on. TH411OU2005. For the last - Answered by a verified HVAC Technician, T6 PRO PROGRAMMABLE THERMOSTAT Manual & Support. TH6320U2008/U, TH6220U2000/U, TH6210U2001/U. Download Manual Download Installation Guide. Download Service Datasheet. T6 PRO PROGRAMMABLE THERMOSTAT Product Page., July 17, 2020 Elaine. The Honeywell Home T9 thermostat is a good choice for smart temperature control in the rooms you care about most. It has some impressive features like a color graphical LCD touchscreen display, 7-day scheduling, 200 ft sensor range and others. It works with Alexa, Samsung SmartThings, Google Assistant and more., 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., For example, if you want your home to be at a cool 76°F by 8:00 a.m., then the system might turn on shortly beforehand to start warming or cooling your home to reach the temperature at the right time. ... Honeywell Thermostat Blinking Cool - Fix Now! By Keshav Krishnan June 10, 2022 January 30, 2023. Is your Honeywell Thermostat's Cool On ..., Aug 28, 2023 · 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. , Cool 77 M32763 On M32761 Heat Off Cool Auto On Fan 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). Fan Switch is used to control your fan. In "Auto" mode, the fan runs only when the heating or cooling ..., Ac not working, and on the thermostat in the upper right corner is is blinking cool on. - Answered by a verified HVAC Technician. We use cookies to give you the best possible experience on our website. ... We have a Honeywell home pro series model TH4210 you 2002 and we can't adjust the thermostat ..., Heat On / Cool On flashing on the screen. Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, without damage to the compressor. Heat pump issues cool air in heat mode, or warm air in cool mode. Check System Setup Option 200 or 218 to make sure it is set to match your heating and cooling equipment, Honeywell has made a business out of helping homes be more comfortable. Today, it is one of the leaders in providing solutions for connected homes, including delivering a variety o..., If you have a green light on your Honeywell water heater that starts blinking, there are a few possible causes. First, it could be that the pilot light is out. If this is the case, you'll need to relight it. Second, the blinking could be caused by a problem with the gas line. If you suspect this is the case, you should call a qualified ..., On most thermostats, the blinking cool means that the unit is in delay mode (usually 5 minutes) or the system isn't actually running. If your thermostat is blinking in cool instead of being solid This could be due to. Blocked Drain (Float switch is killing voltage to thermostat) Break in the thermostat wire between the airhandler/furnace ..., 7 Steps to Troubleshoot a Honeywell Thermostat Flashing "Cool On" Message. 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., 1.6K. 149K views 4 years ago. Honeywell thermostat says "cool on" blinking or "heat on" flashing, but not working after changing batteries. Thermostat …, If you have a heat pump, you will not use a wire in the W terminal. Move the W wire to the W2 or Aux terminal. (W controls your first stage of heating for Gas/Oil/Electric systems. O/B and Y control your first stage heating for heat pump systems. Backup heat sources must be connected to the W2, Aux, or E terminal for proper functionality.), POPULAR VIDEOS. How to properly remove an old thermostat for replacement. Modal 1. How to properly mount and wire the sub-base for the Honeywell Home RTH221B thermostat - Resideo. Modal 1., Sometimes, all you would have to do to get rid of the blinking 'cool on' message is reset the thermostat. If your thermostat has batteries, then insert those backward for 5 seconds to reset the device. To reboot other Honeywell Pro Series thermostats, you would have to: Turn the device on. Press and hold the 'menu' button for 5 seconds.