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.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 TechnicianReplace the battery: Remove the old battery and replace it with a new one. Be sure to follow the manufacturer's instructions for inserting the battery correctly. Reattach the thermostat cover: Once the new battery is inserted, snap the thermostat cover back into place. Turn the power back on: Finally, turn the power back on to the thermostat ...Turning off the Honeywell thermostat's permanent hold setting is easy. It is usually the same for turning off a temporary hold. Depending on your model, you can go ahead and press Run, Cancel, Run Schedule, Use Schedule, Remove Hold, or Cancel Hold. For other models such as the T4 Pro, press the +/- or up/down buttons first then press Cancel or ...A blinking “Cool On” message can indicate various causes, such as dying batteries, a power surge, or a power outage. Thermostat batteries generally last for an average of 10 months, making it easy to identify when dead batteries are responsible for the blinking message. However, sometimes a Honeywell thermostat can recuperate after a power ...To reset your Honeywell t4 Pro thermostat, follow these steps: 1. Locate the “MENU” button on the thermostat. 2. Press and hold the “MENU” button until the screen changes. 3. Navigate to “RESET” using the arrow buttons. 4. Select “RESET” and confirm the reset by pressing “YES” when prompted.A blinking "Cool On" message can indicate various causes, such as dying batteries, a power surge, or a power outage. Thermostat batteries generally last for an average of 10 months, making it easy to identify when dead batteries are responsible for the blinking message. However, sometimes a Honeywell thermostat can recuperate after a power ...This highly scalable All-in-One panel features a powerful central hub for security and life safety that can be customized to suit your home and family. From it's brilliant, intuitive 7" touch-screen, you can control security settings, and much more; all with just the touch of a button. Select a Model: PROA7 ProSeries 7 Inch All-In-One Panel.Easy-to-use, elegant design blends with any décor. Multi-lingual display (English, French, Spanish) Voice capable: Amazon Alexa, 2-way voice, status annunciations, chimes. Scenes control of automation and security. Sounder with audible beeps to indicate: system status, entry/exit delay, other alarm situations.1. Lower Thermostat Temperature. 2. Check Thermostat Batteries. 3. Inspect Electrical Wiring. 4. Reset AC Circuit Breaker. 5. Replace AC Filter. 6. Clean AC …Please try again. Check the name or model number of your product to ensure it's correctly written in the search bar above. If you're looking for a product that isn't a thermostat, try checking here.This video shows how to turn the heating on/off from the Honeywell Home app for the T6 range of Smart Thermostats.For more details on all the possible types ...To troubleshoot the Honeywell T4 Pro thermostat, follow these steps: First, check the power supply. Ensure that the thermostat is receiving power. Next, verify the thermostat settings. Make sure they are properly configured for your desired temperature settings. If the thermostat is unresponsive or not functioning properly, try resetting it.I have a honeywell home pro series. The year is flashing in top of screen select is at bottom but none of the buttons work. Contractor's Assistant: Do you know the model of your Honeywell HVAC unit? Th411ou2005. Contractor's Assistant: How long has this been going on with your Honeywell unit? What have you tried so far?This smart home thermostat also works with your heating system's stages, up to 3 Heat/2 Cool with a heat pump. Energy Savings through Smart Solutions. The ENERGY STAR® certified T6 Pro Smart Thermostat can use its responsive settings to help budget your energy use at home by adapting to your schedule rather than operating at peak times.Again, if it does not, this may be what's causing your Honeywell thermostat not heating up your living quarters. For heat pump systems, a faulty or badly wired changeover valve may also cause weak heating. In this case, your HVAC system may deliver chilled air though the thermostat is really calling for heat. 6.SKU: TH6320WF1005/U. FocusPRO® WiFiSmart Series. The Honeywell Home WiFi FocusPRO® 6000 allows remote access to the thermostat through a computer, tablet, or smart phone with Total Connect Comfort Service. SELECT A MODEL: WiFi FocusPRO 6000 Programmable Thermostat. Find a Pro.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.T6 PRO PROGRAMMABLE THERMOSTAT Manual & Support. TH6320U2008/U, TH6220U2000/U, TH6210U2001/U. Download Manual Download Installation Guide. Download Service Datasheet.Honeywell thermostats are among the most popular models available, and resetting them is fairly simple. To reset a Honeywell thermostat, first locate the 'Reset' button on the display panel. Pressing this button will usually revert all settings back to factory defaults, allowing you to start fresh with your temperature control system.Take control of your home comfort and save on energy costs with a range of Honeywell Home thermostats. From smart WiFi thermostats with room sensors and humidification control, to programmable and non-programmable thermostats, Honeywell Home products meet a variety of needs. ProSeries ... Braukmann HCC100 T6 smart thermostat DT4 room 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 ...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...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 …The Honeywell digital thermostat RTH8500 series can handle most HVAC systems. A 181 code is one of the most common because it is a reminder to replace the air filter. This code can be easily reset after you make sure that the filter has been replaced or inspected. To reset the filter replacement code, simply touch the "dismiss" button on the ...In this video, we show you a basic tutorial on how to replace batteries on a T6 Honeywell Thermostat Pro Series. Anytime you do this, make sure to unplug you...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 ...This smart home thermostat also works with your heating system's stages, up to 3 Heat/2 Cool with a heat pump. Energy Savings through Smart Solutions. The ENERGY STAR® certified T6 Pro Smart Thermostat can use its responsive settings to help budget your energy use at home by adapting to your schedule rather than operating at peak times.Demonstrating how to use a Honeywell home pro series thermostat in my opinion. In this video I go over there is controls of a Honeywell home pro series therm...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 point, the thermostat display should indicate a call for cooling. 2. Confirm that the circuit breakers are on.It will blink "heat on" for a few minutes if you've adjusted anything on the thermostat, as a delay to protect the compressor. It's usually 5 minutes. If it just blinks forever then maybe it's a thermostat problem. If it goes steady on, but the outdoor unit doesn't come on, it's something else. 1.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.Nov 19, 2022 · The reason the light is flashing is that the power outage has switched the thermostat back to setup mode. When a Honeywell thermostat is in setup mode it normally causes the “Cool on” light to blink. If the thermostat shows you that it is in setup mode you just have to set your thermostat again and the problem will be solved automatically.If your Honeywell thermostat is not cooling, resetting it may help resolve the issue. Here are the steps to reset your thermostat: Press the "Menu" button on your thermostat. Scroll down and select "Preferences.". Select "Restore Factory Defaults.". Confirm that you want to reset your thermostat to its factory defaults.View and Download Honeywell Home T4 Pro Series manual online. Programmable Thermostat. T4 Pro Series thermostat pdf manual download. Also for: Th4110u2005, Th4210u2002. ... Cool, Fan, Em. Page 18: Troubleshooting Troubleshooting If you have difficulty with your thermostat, please try the following suggestions. Most problems can be corrected ...RCHT8612WF2015/U, SMHOM8610KIT, RCHT8612WF2015/W, RTH8800WF2022/U, RCHT8610WF2006/U. Download Manual Download Installation Guide. Download Service Datasheet. T5 SMART THERMOSTAT Product Page.These symbols might not be as familiar, but their meanings can significantly enhance your thermostat experience. 1. Humidity Control: - Represented by a water droplet icon or the word "Humidity.". - This symbol indicates that the thermostat can control the humidity levels in your home, optimizing comfort. 2.Check Your Breakers. If your breaker trips, it can interrupt the flow of power to the thermostat and leave you with a blank screen. Fixing this solution should be as easy as resetting your breaker. Go to your home electrical panel and flip the breaker back into the correct position. This should resolve the problem and get your screen ...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 ...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 ...Read Before Installing Honeywell T4 Pro Programmable Thermostat. 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 ...If you replaced the batteries on your CT3200, CT3300, T8112, T8132 thermostat and are still getting the LOW BAT message, follow these steps: 1. Remove the batteries from the thermostat and place them in the opposite / wrong / incorrect position in the thermostat place the (+) on the (-) and vice versa). 2. Leave the batteries like that for 30 ...Honeywell thermostats are among the most popular models available, and resetting them is fairly simple. To reset a Honeywell thermostat, first locate the 'Reset' button on the display panel. Pressing this button will usually revert all settings back to factory defaults, allowing you to start fresh with your temperature control system.The Honeywell Home trademark is used under license from Honeywell International, Inc. This product is manufac- tured by Resideo Technologies, Inc. and its affiliates. Page 17 Série PRO 1000 Thermostat non programmable Auto Manuel d'utilisation Cool Cool Heat Série PRO 1000 Thermostat non programmable 69-2798EFS-03...Here are the main reasons why your Honeywell thermostat is blinking "Cool On": A power outage: A power outage or some other interruption associated with a power source can trigger the thermostat's compressor to restart and activate the 'Cool On' icon to blink. Chaining the Set Temperature: Readjusting the temperature manually after ...Cool Only Thermostat- Dual Scale Fahrenheit and Celsius Heat Only - 50-90 F 15-30 C for Vdc and millvoltage systems 1 Heat/1 Cool Thermostat - 7-32 CWhat “Cool On” Blinking Means: The “Cool On” blinking on a Honeywell thermostat indicates it is in a delay mode, often a safety feature, before activating the air …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.Is the “Cool On” message solid (not blinking) on the thermostat display? 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.Learn about Honeywell Home smart thermostat integration with Amazon Echo, and view a list of Alexa thermostat commands available for your Honeywell thermostat. ... (Heat/Cool/Auto/Off)" "Alexa, set [group or thermostat name] to x degrees until 7 PM" * "Alexa, set the Living Room to 72 degrees until 7:15PM".INSTALLING YOUR THERMOSTAT. First, let's identify your device. Select the product you're having trouble with from the options below. BUOY™ WHOLE HOME WATER CONTROLLER. Buoy™ Whole Home Water Controller. SiX® Two-Way Wireless Motion Detector.Unsure if Honeywell Home thermostats from Resideo are compatible with your home? Use our tool to determine which thermostats work with your home's existing wiring. Check Compatibility. APP STATUS. Your issue may be related to a system outage on one of our applications. See current status of Resideo's mobile applications belowSome 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.What “Cool On” Blinking Means: The “Cool On” blinking on a Honeywell thermostat indicates it is in a delay mode, often a safety feature, before activating the air …In a matter of minutes, the air should kick on and the snowflake will remain solid. If the blinking does not stop, the next step is to switch the dial to "off.". Perhaps the thermostat did not properly relay to the HVAC system. By moving the switch to "off" and then back to "cool," you can start the system up again.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.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 ...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.Setting it to “On” will keep the fan running continuously, which may not resolve the cool on blinking issue. 4. Verifying the schedule settings. If you have programmed a schedule on your thermostat, ensure that the cooling schedule aligns with your desired comfort settings. A conflicting schedule may result in the cool on blinking …Temperature settings do not change. Make sure heating and cooling temperatures are set to acceptable ranges: • Heat: 40 °F to 90 °F (4.5 °C to 32.0 °C) • Cool: 50 °F to 99 °F (10.0 °C to 37.0 °C) "Cool On" or "Heat On" is flashing. • Compressor protection feature is engaged.To activate cool mode on your thermostat, tap Mode on the device screen until the mode changes to Cool. Also, press the minus button on the left side of the screen to achieve your preferred temperature setting. Note that the procedure for activating Cool mode on your Honeywell thermostat depends on the model you have.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...SKU: RTH221B1039/U1. Easy to Install and Program With the Honeywell Home 1-Week Programmable Thermostat from Resideo, you can customize comfort to fit your weekly schedule. It's easy to install and works with all standard home HVAC systems. SELECT A MODEL: 1-Week Programmable Thermostat.A ‘cool on’ message will be flashing on your Honeywell thermostat, in case the system is in delay mode or if the batteries need to be changed; simply wait for 5 …Turning off the Honeywell thermostat's permanent hold setting is easy. It is usually the same for turning off a temporary hold. Depending on your model, you can go ahead and press Run, Cancel, Run Schedule, Use Schedule, Remove Hold, or Cancel Hold. For other models such as the T4 Pro, press the +/- or up/down buttons first then press Cancel or ...Your Honeywell thermostat says heat on but no heat because there could be several reasons for this issue. First, check if the thermostat temperature setting is higher than the current room temperature. Ensure it's in " Heat" mode and not set to "Cool" or "Off.". Confirm the thermostat has power, including checking the circuit breaker.Cool on indicator flashing on Honeywell thermostat I have a honeywell pro th4000 series system. the cool on indicator is flashing. I have followed the instructions in the operating manual, however, it still keeps flashing.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.The 4000 series comes with a reset button. To reset, turn on the thermostat and press the "Program" button thrice. Then find the reset button located inside a small hole on the front panel of the thermostat and use a sharp object to press the button for about 5 seconds. Now your thermostat has been reset.The most common problem is that your compressor needs 5 minutes to cool down if your Honeywell thermostat is blinking “Cool On”. Otherwise, you may need to clean or replace your AC filter if it is clogged with debris. Simply reset your circuit breaker if your Honeywell thermostat says “Cool On” but won’t work after a power outage.The T1 Pro Non-Programmable Thermostat comes with the standard UWP mounting system. The soft key controls (with a 2.37 sq. in. display) and the easy-to-read LED back light make this thermostat from Resideo one of the best choices in temperature control on the market. SELECT A MODEL: T1 Pro Non-Programmable Thermostat - 24 Vac.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.La boîte comprend : Thermostat T6 Pro. Système de montage UWP. 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.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.Why does my T9/T10 Thermostat fail to power on? Check your wiring to see if you have a C-wire. If you do not see a wire in the C terminal, refer to your Installation Guide / C-Wire Adaptor Guide to install using the c-wire adapter. Then, reset your thermostat by either gently pulling it off the wall near the base of the thermostat, allowing for ...Honeywell 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 5 stars 106 35 offers from $59.99T4 Pro Programmable Thermostat, 1 Heat/1 Cool. SKU: TH4110U2005/U. Simple Control with Smart Learning. Easy to install and intuitive to use, the T4 Pro Programmable Thermostat learns how long it takes your system to reach the desired temperature and activates the system earlier to help you feel comfortable sooner. SELECT A MODEL:How do I switch my TH1110D2009, TH1010D2000 between heating and cooling? Last updated. 2/25/22. Pressing the Menu button will cause the Mode and Fan menus to appear. Press Mode (-) to cycle through the available modes. Please note the TH1010D2000 will only have the options of heating or cooling and off.By following the guide below, you can identify and resolve the problem, ensuring your home stays cool and comfortable during hot summer months. Page Contents. 1 Understanding Your Honeywell Thermostat; ... The Honeywell AC thermostat cool on blinking issue can be resolved through a series of troubleshooting steps. Start by inspecting the ...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.The 4000 series comes with a reset button. To reset, turn on the thermostat and press the "Program" button thrice. Then find the reset button located inside a small hole on the front panel of the thermostat and use a sharp object to press the button for about 5 seconds. Now your thermostat has been reset.Blowing hot air on cool mode. HONEYWELL PRO SERIES. 1 HOUR I tried turning it down and still ... Ok now COOL ON is blinking Customer attachment 10/23/2023 3 ... I have a Honeywell home pro series thermostat an the reset was hit an now it's blowing hot air and I don't know what to do but I have two disabled people living here ...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)When you see "Wait" or "Waiting for Equipment" on your Honeywell thermostat, it's signaling that the system is currently in a safety delay. This built-in safeguard pauses the operation of your HVAC equipment, specifically, the compressor, to allow for a proper cooldown and reduce the strain on the hardware. Implementing this pause ...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: 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.Honeywell Thermostat Flashing “Cool On” Basics. A Honeywell thermostat is a user-friendly device designed to control and regulates indoor temperature settings in homes and businesses. It helps maintain comfortable and energy-efficient environments by allowing users to customize heating and cooling systems.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)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 moreIf your Honeywell thermostat won't go above 70, it is likely due to the temperature limit setting. You can adjust this setting using the up and down arrows on your thermostat. To do this, press "Settings" and then select "System.". From there you will need to scroll down until you see "Heat/Cool Limit Set.". Once selected, use the ...The fix. If your thermostat is flashing cool on, wait for 5 minutes until the delay is over. Usually the thermostat delay should not take more than 5 minutes. However, if your thermostat is not blowing cold air after the delay period, there could be issues causing this problem. Let's go to the next step to find out more.I have a Honeywell Pro Series Thermostat, both Thermostat and furnace are 1 year old. The heat is 'on', above the 'Auto Fan' is a triangle with an ! mark in the middle. I can't find what the problem w …Confirm the message "Cool On" is solid (not blinking) on, We're coming to the end of another Evil Week here at Lifehacker and, as usual, it, The cool on is blinking but ac not on, pro series 1-2 years old, it was off to - Answered by a verified H, Try Resetting the Thermostat to Factory Settings. 1. Honeywell Lyric Y Family. , In this video, we will walk you through troubleshooting a Honeywell thermostat with a blinking "Cool On" messa, Select "Schedule Reset". PERFORMING A HOMEKIT RESET. Press the Menu Icon. Scroll down to "Thermos, Here’s How to Fix It. What does the Honeywell thermostat “cool on” indicat, 1-800-468-1502. Introduction. The Honeywell T6 Pro Z-Wave Programma, Fix 1: Check if the batteries were installed correctly. Fix 2: Chang, If you see Honeywell thermostat flashing cool on, give it a time, arou, A full WiFi Reset can be performed one of two ways: When registere, If you replaced the batteries on your CT3200, CT3300, T8112, T8, Honeywell Thermostat Cool ON Is Flashing Flashing lights on a t, Press the button below System on your Honeywell thermosta, How often do you hear from customers who say their Honeywell , Honeywell thermostat flashing “cool on”. A/C is not bl, To reset your Honeywell t4 Pro thermostat, follow these steps:, TROUBLESHOOTING YOUR THERMOSTAT. First, let's identify your de.