T3 honeywell thermostat manual

Thermostat; T3; Honeywell T3 Manuals Manuals and User Guides for Honeywell T3. We have 1 Honeywell T3 manual available for free PDF download: User Manual . Honeywell T3 User Manual (22 pages) Programmable Thermostat. Brand: Honeywell ...

Screen is blank Replace the batteries (T3 & T3R only). Check the OpenTherm boiler has power (T3M only). Contact installer. Thermostat shows Batteries have less than 10% power and need to be replaced soon. Thermostat shows + Batteries are critically low and need to be replaced immediately - see ‘Changing the Batteries’. Thermostat shows Thermostat Honeywell LYRIC T4 Product Specification Sheet. (10 pages) Thermostat Honeywell T4R Quick Start Installation Manual. Wireless programmable thermostat (2 pages) Thermostat Honeywell T4M Quick Start Installation Manual. Programmable modulating thermostat (2 pages) Thermostat Honeywell Chronotherm T4700 Installation Instructions.manual Honeywell T3 T3 / T3R PROGRAMMABLE THERMOSTAT 1 2 1 1 2 2 2 Screen and button overview Screen and button overview / Overzicht van schermen en knoppen / …We purchased a Honeywell Home T3 programmable thermostats. Installation was easy, and initially the thermostat appeared to work correctly. However, I noticed that the fan ran continuously, and when it was checked by an HVAC specialist (two actually) it was confirmed that the thermostat was defective and was sending heat and cool signals at the ...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. Home. Shop All Products. Air.Honeywell Home. RCHT9610WF T9 + Smart Room Sensor White Thermostat and Room Sensor with Wi-Fi Compatibility. Shop the Set. Model # RCHT9610WFSW2003/W. Find My Store. for pricing and availability. 10. Honeywell Home. 6.5-in x 7.25-in Plastic Lockable Rectangle Thermostat Cover. The first step to understanding a Honeywell T3 Programmable Thermostat Wiring Diagram is to understand the difference between two-wire and three-wire connections. A two-wire connection is used when the thermostat is connected directly to the heating elements. In this case, only two wires are needed to connect the thermostat and the heating ...

Feb 14, 2022 · 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 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 SupportIntuitive user interface, large, clear display with backlight for easier viewing in all light conditions, simple large symbols, and Off/Manual/Auto modes at the touch of a button. Reliable, encrypted, two-way wireless communication between the thermostat and the wireless receiver box. Application That is what I would call a 5-2 programmable thermostat. Second problem is there is no mounting bracket supplied that screws into a standard outlet box. The UWP mount by itself is too small to screw directly over the outlet box. I was replacing an existing non-programmable Honeywell thermostat using an identical UWP mount.View online Operation & user’s manual for Honeywell T3 Thermostat or simply click Download button to examine the Honeywell T3 guidelines offline on your desktop or …

honeywell t3 thermostat installation manual. honeywell thermostat t3r manual. honeywell home thermostat t3 manual. honeywell t3 wireless thermostat manual. honeywell t3 pro series thermostat manual. honeywell t3 thermostat reset. honeywell t3 programmable thermostat wiring diagram. t3r thermostat instructions. t3 …This manual is also suitable for: Ct3455 Honeywell/34 ct3400 Honeywell/34 ct3455. View and Download Honeywell CT3400 instructions manual online. Weekday/Saturday/Sunday Programmable Heat and/or Cool Low Voltage (20 to 30 Vac)Thermostat and Wallplate. CT3400 thermostat pdf manual download. Also for: Ct3455, Honeywell/34 ct3400, …The thermostat then uses the data to change the temperature of the house during the day and night. Many Trane thermostats (like the ComfortControl) have a 7-day programmable feature. The 7-day programmable thermostat is one of the best of its kind. With these thermostats, you can program a separate schedule for all 7 days of the week …3 Remove the old thermostat’s faceplate. On most thermostats, you can take off the faceplate by grasping and gently pulling. Some thermostats may have screws, buttons, or clasps. Do not remove any wires from your thermostat at this time! 75 75 OFF OFF ON OFF OFF ON Breaker box Switch 4 Make sure there are no 120/240V wires. Do you have thick ...

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Honeywell Home. RCHT9610WF T9 + Smart Room Sensor White Thermostat and Room Sensor with Wi-Fi Compatibility. Shop the Set. Model # RCHT9610WFSW2003/W. Find My Store. for pricing and availability. 10. Honeywell Home. 6.5-in x 7.25-in Plastic Lockable Rectangle Thermostat Cover. May 5, 2023 · Honeywell Thermostat Instruction Manuals. Honeywell has been in business for over 100 years so they have a lot of Thermostat models! That is why we've provided a powerful search function so you can find the exact manual you need. In case you don't know the specific model number we have also included images of each thermostat below to guide you. When you want to get back to your scheduled program for your HVAC system, you can simply turn off the temporary hold. Before you do that though, you’ll have to unlock your Honeywell Thermostat.Subject to the model you own, you can do this by tapping on one of these options – Cancel, Cancel Hold, Remove Hold, Run, Run …This manual is also suitable for: Ct3455 Honeywell/34 ct3400 Honeywell/34 ct3455. View and Download Honeywell CT3400 instructions manual online. Weekday/Saturday/Sunday Programmable Heat and/or Cool Low Voltage (20 to 30 Vac)Thermostat and Wallplate. CT3400 thermostat pdf manual download. Also for: Ct3455, Honeywell/34 ct3400, …Jan 30, 2023 · Steps to reset Honeywell thermostat 6000 series. Press the FAN button and hold it. Press and hold the UP arrow button without releasing the FAN button. Keep holding both the button for 5-10 seconds. Now release both the button and press the first button from the right.

Read online Honeywell RTH6580WF User’s Manual pdf with better navigation.Printable and downloadable Honeywell RTH6580WF user guide pdf. Brand:Honeywell Product:Thermostats Model:RTH6580WF Page: 140 Page(s) Download (PDF, 4.26MB) Note: For opening this Honeywell Thermostat RTH6580WF User Manual, your …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 SupportSelect “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”.Operating Manual 69-2727ES—01 2 About your new thermostat Your new Honeywell thermostat has been designed to give you many years of reliable service and easy-to-use, push-button climate control. Features • Backlit display on RTH2300 • Displays ambient (measured) temperature at all times • One-touch access to setpoint temperature Honeywell Thermostats AQ1000TN2 User’s Manual (PDF) Honeywell AC-140-7 User’s Manual (PDF) Honeywell rth230b Installation And User Manual (PDF) Honeywell RTH9580 Wi-Fi User Manual (PDF) HONEYWELL FOCUSPRO 6000 USER MANUAL (PDF) Honeywell Pro 3000 Series Installation Manual.Thermostat Honeywell Home T3 Quick Start Installation Manual. Wired programmable thermostat (2 pages) Thermostat Honeywell Home T3 Manual. (11 pages) Thermostat Honeywell Home T3 Pro Installation Instructions Manual. (37 pages) Thermostat Honeywell Home T3 Pro User Manual. (25 pages) Thermostat Honeywell Home T6 Pro User Manual. View online Operation & user’s manual for Honeywell T3 Thermostat or simply click Download button to examine the Honeywell T3 guidelines offline on your desktop or …Learn more about Honeywell Thermostats from Resideo at: https://bit.ly/3mD8GLwLearn how to reset in just a few steps the Lyric T series, Lyric Round and our ...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 SupportIf you want to change the heat set point when it says “auto cool, you must first press the mode button until the mode shows “heat”, then use the + or – to change the heat set-point. Then press the mode button to switch the mode back to Auto Changeover. If you are trying to set the heat and cool set points for your program settings (wake ...RTH6360D1002 Honeywell home T3 / home owners thermostat get it at most home improvement stores. How to wire it up and configure it to your specific needs wea...

This manual is also suitable for: Ct3455 Honeywell/34 ct3400 Honeywell/34 ct3455. View and Download Honeywell CT3400 instructions manual online. Weekday/Saturday/Sunday Programmable Heat and/or Cool Low Voltage (20 to 30 Vac)Thermostat and Wallplate. CT3400 thermostat pdf manual download. Also for: Ct3455, Honeywell/34 ct3400, Honeywell/34 ct3455.

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 SupportNewer WiFi and some connected Honeywell thermostats, like the Lyric T5, VisionPro and certain Prestige models have a date option at the time setup that can include time adjustment for daylight savings time. If you have this feature, the thermostat will automatically update the time based upon the location that the device is registered in.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. Support Center. CHAT WITH A SPECIALIST Online chat. Get support for your RTH2300 5-2 DAY PROGRAMMABLE THERMOSTAT, from installation and manuals to troubleshooting tips and replacement information. Visit https://bit.ly/3eQISe3 for more information about the Resideo Honeywell Home T3 thermostat.This video covers how to enter, navigate, and modify advance...Write down the colors of the wires. Check the boxes and write down the color of the wires connected to terminals in the existing wall plate. Check all that apply (not all will apply). Note: If there are wires in terminals that aren't listed, you will need additional wiring support. Contact Support at 1-855-733-5465.Installing your RTH6360 thermostat. 10. Bundle and insert wires through the UWP. Pull open the UWP and insert the bundle of wires through the back of the UWP. Make sure at least 1/4-inch of each wire is exposed for easy insertion into the wire terminals.Honeywell Home. RCHT9610WF T9 + Smart Room Sensor White Thermostat and Room Sensor with Wi-Fi Compatibility. Shop the Set. Model # RCHT9610WFSW2003/W. Find My Store. for pricing and availability. 10. Honeywell Home. 6.5-in x 7.25-in Plastic Lockable Rectangle Thermostat Cover.

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With the Honeywell Home PRO 3000 Non-Programmable Thermostat from Resideo, you can expect years of reliable temperature control. Complete with push-button climate control, an easy-to-read backlit display, and professional installation. Other features include: Displays both room temperature and temperature setting. One-touch temperature controls.The RTH5160 Simple Display Non-Programmable Thermostat has all the features you love - straightforward readings, single-degree control, basic functions - with a backlit, easy-to-read display that shows both your temperature and set point simultaneously. Change is Good. This thermostat is all about change. How to program a programmable Honeywell or any brand thermostat. Most programmable thermostats have very similar options and settings. This video goes over w...Disconnect the wires and remove the old thermostat baseplate. Install the baseplate for the new thermostat. Use the image on your phone to connect the wires to the correct terminals. Install batteries if necessary, snap on the cover plate and turn the circuit breaker back on. Originally Published: January 04, 2023.Honeywell Home T4 Pro User Manual View and Read online. Thermostat controls. System operation settings. Program Schedule. Est. reading time 10 minutes. T4 Pro Thermostat manuals and instructions online. Download Honeywell Home T4 Pro PDF manual.Popis produktu. 7denní programovatelný kabelový termostat Honeywell Home T3. Plně programovatelný moderní, levný termostat s mnoha funkcemi. Termostat T3 je vytvořen tak, aby byl nejsnadněji instalovatelným termostatem na trhu. Dokonalý pro ty osoby, které preferují ovládat své pohodlí co nejsnadněji.Honeywell CM701. List of available manuals, guides and instructions for Honeywell RTH6360D programmable thermostat (RTH6360, RTH6360D1002). Honeywell T3 & T3R Wired and Wireless Programable Room Thermostat. Honeywell Home.Setup, Programming 5 & 2 Day or 7 Day, Full Operation Covering Everything ...Find out about the Honeywell Wi-Fi Programmable Touchscreen Thermostat that lets you control the temperature in your home through your smartphone or computer. Expert Advice On Improving Your Home Videos Latest View All Guides Latest View Al...Set Alerts: Having your smart thermostat connected to your Wi-Fi lets you set alerts if a room in your home gets too cold or too warm or if the humidity changes too much.You can have the alerts sent via text or email; then you can adjust the temperature no matter where you are.; Use Multiple Thermostats: If you have a thermostat in each …Here are some quick tips on resetting the factory setting to most Honeywell thermostats: 1. Confirm your thermostat is ON. 2. Press and hold down the MENU button for 5 seconds. 3. Use the scroll buttons to move to … ….

If your thermostat is set to “On,” then your fan will keep running, regardless of the heat/cool settings. [9] 3. Adjust the general system settings. Your general choices in this section are: Heat, Cool, Off, or Auto. The “Heat” button activates the heating system, whereas the “Cool” button will turn on your AC.Honeywell T3 User Manual (22 pages) Programmable Thermostat Brand: Honeywell | Category: Thermostat | Size: 0.98 MBThe RTH5160 Simple Display Non-Programmable Thermostat has all the features you love - straightforward readings, single-degree control, basic functions - with a backlit, easy-to-read display that shows both your temperature and set point simultaneously. Change is Good. This thermostat is all about change.honeywell t3 thermostat installation manual. honeywell thermostat t3r manual. honeywell home thermostat t3 manual. honeywell t3 wireless thermostat manual. honeywell t3 pro series thermostat manual. honeywell t3 thermostat reset. honeywell t3 programmable thermostat wiring diagram. t3r thermostat instructions. t3 …1. Turn off the thermostat if possible. It’s generally a good idea to turn your unit off before replacing the batteries. Many Honeywell models have a slider switch, an on/off button, or arrow buttons that allow you to set the system to …Nov 22, 2022 · honeywell t3 thermostat installation manual. honeywell thermostat t3r manual. honeywell home thermostat t3 manual. honeywell t3 wireless thermostat manual. honeywell t3 pro series thermostat manual. honeywell t3 thermostat reset. honeywell t3 programmable thermostat wiring diagram. t3r thermostat instructions. t3 programmable thermostat manual ... 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 SupportHoneywell Home T3 Manual Also See for T3: Quick start user manual (2 pages) , Quick start installation manual (2 pages) , Quick start manual 1 2 3 4 5 6 7 8 9 10 11 page of …For those who want the most flexible and easy way to control their comfort. Contains a battery-powered wireless thermostat (2xAA batteries included with a 2-year lifespan) and a wireless receiver box. Wireless thermostats can be placed anywhere in the home since no wires are needed between the thermostat and the boiler. Includes table stand. T3 honeywell thermostat manual, Jan 30, 2023 · Steps to reset Honeywell thermostat 6000 series. Press the FAN button and hold it. Press and hold the UP arrow button without releasing the FAN button. Keep holding both the button for 5-10 seconds. Now release both the button and press the first button from the right. , 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 , Honeywell T3 User Manual (22 pages) Programmable Thermostat Brand: Honeywell | Category: Thermostat | Size: 0.98 MB, If your thermostat is set to “On,” then your fan will keep running, regardless of the heat/cool settings. [9] 3. Adjust the general system settings. Your general choices in this section are: Heat, Cool, Off, or Auto. The “Heat” button activates the heating system, whereas the “Cool” button will turn on your AC., thermostat that has a blank display, skip this step. 1 Turn power OFF. To protect yourself and your equipment, Turn off the power at the breaker box or switch that controls your heating/cooling system. 3 Remove the old thermostat’s faceplate. On most thermostats, you can take off the faceplate by grasping and gently pulling. Some thermostats , Tighten the calibration screw: Manual thermostats come with a calibration screw. You will need to tighten the calibration screw. You will find this screw inside a curled metal piece in the thermostat. Use a screwdriver that fits the calibration screw. Now you will need to turn the screw back and forth. Wait for a while and turn the screw back ..., SKU: RTH6360D1002/E. Programmable Comfort. You can schedule comfort throughout the week and weekend with the Honeywell Home 5-2 Day Programmable Thermostat. It has Smart Response Technology, so it continually adjusts heating/cooling to be the right temp at your programmed time. SELECT A MODEL:, These thermostats are Wi-Fi-enabled. So you can control them from your phone, tablet, or computer. Here’s how to do a factory reset: Simultaneously press the button showing an up arrow and the fan button. While holding these two buttons, change the number on the left to 90, and the number on the right to 1. Press Done., 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., Honeywell T3: User Manual | Brand: Honeywell | Category: Thermostat | Size: 0.98 MB | Pages: 22. This manual is also suitable for: T3m, T3r ., For those who want the most flexible and easy way to control their comfort. Contains a battery-powered wireless thermostat (2xAA batteries included with a 2-year lifespan) and a wireless receiver box. Wireless thermostats can be placed anywhere in the home since no wires are needed between the thermostat and the boiler. Includes table stand., 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+ …, Honeywell Thermostats AQ1000TN2 User’s Manual (PDF) Honeywell AC-140-7 User’s Manual (PDF) Honeywell rth230b Installation And User Manual (PDF) Honeywell RTH9580 Wi-Fi User Manual (PDF) HONEYWELL FOCUSPRO 6000 USER MANUAL (PDF) Honeywell Pro 3000 Series Installation Manual. , Wire the thermostat. See section 2.2 for terminal designations and section 3 for typical wiring diagrams. 4. Reinstall the thermostat onto its base and secure with the cap-tive screw. 2.2 Terminal Designations The designations of the terminals vary according to the particular model of thermostat. Refer to the following table for the description, 2 Choose thermostat location and install wall bracket 3 Connect system wiring 4 Activate batteries and attach thermostat cover 5 Restore electric power 6 Setup and test system operation NO NO OK 1.2 — 1.5 m Remove the thermostat cover and use a screwdriver to pry open the tabs as shown at left, then remove the thermostat from the wall bracket. , 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+ …, 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 , Honeywell T3: User Manual | Brand: Honeywell | Category: Thermostat | Size: 0.98 MB | Pages: 22. This manual is also suitable for: T3m, T3r ., honeywell t3 thermostat installation manual. honeywell thermostat t3r manual. honeywell home thermostat t3 manual. honeywell t3 wireless thermostat manual. honeywell t3 pro series thermostat manual. honeywell t3 thermostat reset. honeywell t3 programmable thermostat wiring diagram. t3r thermostat instructions. t3 …, 2 Choose thermostat location and install wall bracket 3 Connect system wiring 4 Activate batteries and attach thermostat cover 5 Restore electric power 6 Setup and test system operation NO NO OK 1.2 — 1.5 m Remove the thermostat cover and use a screwdriver to pry open the tabs as shown at left, then remove the thermostat from the wall bracket. , Non-Programmable Thermostats. For simplicity and comfort control, look to Honeywell Home non-programmable thermostats. From the classic circular dial model to easy-to-use soft-touch buttons and backlit displays, our non-programmable thermostats allow you to easily set your preferred temperature with the touch of your hand. Home. Shop All Products., May 5, 2023 · Honeywell Thermostat Instruction Manuals. Honeywell has been in business for over 100 years so they have a lot of Thermostat models! That is why we've provided a powerful search function so you can find the exact manual you need. In case you don't know the specific model number we have also included images of each thermostat below to guide you. , 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 of digital thermostat models, along with more traditional the..., T3 7 Day Programmable Wired Thermostat. A modern, affordable, fully-programmable and feature-rich thermostat. The T3 is designed to be the easiest to use and install thermostat on the market. Perfect for those who prefer to control their comfort in the simplest way. The T3 is battery-powered, with a 2-year battery lifespan., Honeywell T3 User Manual. Download Operation & user’s manual of Honeywell T3 Thermostat for Free or View it Online on All-Guides.com. Brand: Honeywell. Category: Thermostat. Type: Operation & user’s manual. Model: Honeywell T3 , Honeywell T3M , Honeywell T3R. Pages: 22., Select “Change Network”. Select the new Wi-Fi network and enter the password. PERFORMING A SCHEDULE 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”., Thermostat; T3R; Honeywell T3R Manuals Manuals and User Guides for Honeywell T3R. We have 1 Honeywell T3R manual available for free PDF download: ... (T3 & T3R Only) 16. 7 ) Table Stand and Wall Mount (T3R Only) 19. 8 Wireless Receiver Box (T3R Only) 19. 9 Troubleshooting. 20. Advertisement. Advertisement., Resideo products create the supported home. With products ranging from thermostats to alarms and water to energy solutions, Resideo goes beyond installation to integration of whole home solutions. Solutions. Smart Home Partners Software & Apps Pro Portal. Resources toggle menu. , thermostat that has a blank display, skip this step. 1 Turn power OFF. To protect yourself and your equipment, Turn off the power at the breaker box or switch that controls your heating/cooling system. 3 Remove the old thermostat’s faceplate. On most thermostats, you can take off the faceplate by grasping and gently pulling. Some thermostats , Honeywell Home T3 Pro Installation Instructions Manual Also See for T3 Pro: User manual (25 pages) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30, Honeywell Home. RCHT9610WF T9 + Smart Room Sensor White Thermostat and Room Sensor with Wi-Fi Compatibility. Shop the Set. Model # RCHT9610WFSW2003/W. Find My Store. for pricing and availability. 10. Honeywell Home. 6.5-in x 7.25-in Plastic Lockable Rectangle Thermostat Cover., The Honeywell T9 Smart Thermostat is a technologically advanced device designed to efficiently regulate the temperature in a household. This thermostat boasts a sleek and modern design that can seamlessly integrate into any home decor. Equipped with smart features, the Honeywell T9 allows users to easily control and monitor their home's …, S Not used for T3 thermostat. L/A - A Not used for T3 thermostat. S O/B Changeover valve Y Compressor contactor (stage 1) AUX - W2 Auxiliary heat (TH3210U only) Y2 Not used for T3 thermostat. E Emergency heat (TH3210U only) G Fan W Heat (stage 1) C 24VAC common. For 2 transformer systems, use common wire from cooling transformer. K Not used for ...