That tilts the mercury bulb inside the thermostat in one direction or the other depending on the temperature. Overriding Your Current Temperature. Mercury thermostats are simple and long-lasting, but, like all thermostats, they can develop problems in the wiring or internal. Confirm your thermostat is ON 2. Step 1: remove the control module and connect the two cables together like this: 3 wire cable > 5 wire cable Red > red White > white Green > Brown You wont use any of the other wires in the 5 wire cable. If COLD, this means your thermostat is cooling correctly, but the heating isn’t working properly. How to program a programmable Honeywell or any brand thermostat. The Honeywell mercury thermostat has been a standard in homes and businesses for decades, but most of these old non-programmable thermostats have been replaced with basic digital. Do you also have an AC? The top thermostat has a heat and cool switch. You need to hire an HVAC tech to trace the wiring of each thermostat and determine how they are connected to your heating system. How To Easily Program a Honeywell Thermostat The Amateurs Amateur-If I Can Do It You Can Do it 7. We tried resetting it with changing the - Answered by a verified HVAC Technician. This video goes over what each of the buttons does, how. It might be three years old. honeywell thermostat control. button on my thermostat doesnt work. To manually reset a thermostat, first turn off your thermostat using the power control switch. Time Switch - Simple device that provides the ability to turn on/off or boost your heating. Press the “+”/-,” or “up/down” buttons, follow the prompts, and. Insert the battery in the opposite direction, i. Press the plus or minus icon to set the time in 15-minute increments. Ask Your Own HVAC Question We must determine why we have lost our 24 volts to the thermostat. Honeywell has produced a multitude of thermostat types over the last 50 years. With older manual thermostats, the easiest way for homeowners to check for an improper installation is to locate a level. Open the door of the battery compartment. If you have one of the earlier Honeywell models, you press the hold button and set the temperature you require. The Honeywell mercury thermostat has been a standard in homes and businesses for decades, but most of these old non-programmable thermostats have been replaced with basic digital thermostats or smart thermostats. Honeywell Thermostat Permanent Hold Explained: What & How to Use. Time Switch – Simple device that. Honeywell Vertical Thermostat; after several years are no longer energy efficient. Many programmable and smart thermostats need a third wire — called the common, or C wire — to supply power for their various functions. If COLD, this means your thermostat is cooling correctly, but the heating isn’t working properly. If the unit is rectangular, like the Honeywell CT53K1006, the dial is often replaced by a lever. How to unlock a Honeywell pro series thermostat that’s. Mercury is typically found in older mechanical thermostats like the Honeywell Round T87 and rectangular T8090. How to unlock a Honeywell pro series thermostat that’s Does that look like its working? Customer attachment 4/29/2023 2:18:40 AM André R. The Honeywell thermostat (PC8900) that I have does not have a conventional C, R, Y1/2, W1/2, G set of wires and instead communicates with a second unit in the attic using wires labeled 1, 2, 3, and 4. Confirm your thermostat is ON 2. Honeywell has produced a multitude of thermostat types over the last 50 years. You can re-connect the wiring after. Honeywell thermostat Maintenance Tips & Tricks. How To Use a Honeywell Thermostat. Disconnect the wires and remove the old thermostat baseplate. How to Program a Honeywell Thermostat. Thermostats Security Air Quality Water Leak Detector Apps. Go to your thermostat and switch from Heating to Cooling and then feel the temperature of the air blowing from the vent. Just an intuitive flash, but before disassembling the device and pronouncing it irreversibly dead, you might want to check the room temperature on a thermometer. Save energy and costs by changing out this older model thermostat, also help out the home environment, it. Press the plus or minus icon to set the time in 15-minute increments. How to unlock a Honeywell pro series thermostat that’s locked. Im hooking up a Honeywell 9000 thermostat and I have an 8 wire Coming out of the wall. To clear the schedule on a Honeywell thermostat, all you need to do is press and hold the HOLD button. I have a heat-only natural gas furnace with a fan. (Bryant 315aav036070adja) The thermostat Im trying to install is a Honeywell TH4110U2005/U. Locate the batteries by removing the battery compartment tray or cover or by removing the unit’s faceplate. How to Use a Honeywell AC Control Press the + or - button to temporarily select a new desired temperature. How to program a programmable Honeywell or any brand thermostat. Step 2 – Bring Out the Room Thermometer. How to unlock a Honeywell pro series thermostat that’s locked. Install the baseplate for the new thermostat. The first step will be to see if your thermostat is powered properly. If you have a C wire, place it into the C terminal on your wall plate. NOTE: Do not place your old thermostat in the trash if it contains mercury in a sealed tube. Press the respective button for your model thermostat again and the temperature will begin blinking. If your thermostat is connected to a furnace, check the furnace door. Then, open the battery door and take out the batteries. Sometimes, the display screen doesn’t read anything. This should give the system time to reset. Select the desired Wi-Fi Network and touch “Connect”. Use the image on your phone to connect the wires to the correct terminals. White wire spliced and connected to new Red wire secured to the W1 slot. How To Reset Honeywell Thermostats: All Models Guide. The reset button is located inside a small hole on the front panel of the thermostat and to the right of the buttons. All Honeywell thermostats that have batteries store the batteries in the control panel. Blue – This is your common or “C” wire. Here are some quick tips on resetting the factory setting to most Honeywell thermostats: 1. Some models provide the ability to program 1 Day or 7 Days. After removing and labeling all wires, unscrew the old thermostat wall plate and mount the new thermostat’s wall plate. Honeywell is not going to be able to tell you how the thermostats are connected in your house. How To Use a Honeywell Thermostat. Use the image on your phone to connect the wires to the correct terminals. to Wire a Honeywell Thermostat. Activate the valve for Heat Mode Red to R 24 VAC. Select the desired temperature by turning the dial, moving the lever or pushing the up/down buttons. The thermostat will have a glass tube with a silver liquid inside of the tube. You can re-connect the wiring after mounting the new thermostat’s wall plate. The Honeywell thermostat (PC8900) that I have does not have a conventional C, R, Y1/2, W1/2, G set of wires and instead communicates with a second unit in the attic using wires labeled 1, 2, 3, and 4. honeywell thermostat control. Remove the cover from the old thermostat and take a picture of the wires with your phone (youll see why in a sec). Then, press and hold the blank button in the center of the screen. Here is the sequence of colored wiring coming from the thermostat to the board: Red wire spliced and connected to new Red wire secured to the R slot. Blue to B REVERSING VALVE - a HEAT PUMP. Digital Nonprogrammable Honeywell Thermostats. Attached are two photos, the first showing the existing thermostat with the control wiring and a second photo showing the Honeywell thermostat that I tried connecting to. Im hooking up a Honeywell 9000 thermostat and I have an 8 wire Coming out of the wall. Touch Select again to save your new temperature reading. There was a black and a Brown on the previous thermostat hook 22S terminals This new thermostat does not have an … read more. 6 things you should do before you replace your current. How old is it? Thermostat is in the hallway. Wait for 5-10 seconds, take the batteries out, and put the batteries in the proper way. Connect the wires to your new Honeywell thermostat in the same way. Here are some quick tips on resetting the factory setting to most Honeywell thermostats: 1. Green wire spliced and connected to new Green wire secured to the G slot. How Do I Set My Honeywell Thermostat?. Honeywell Programmable Thermostat Manual for Troubleshooting Step 1 – No Life Signs on the Display Honeywell digital thermostats share one common problem. Honeywell Thermostat Not Working After Battery Change: How to …. They can be replaced with newer, mercury-free thermostats that look just like the old Honeywell rounds. Now, your thermostat has been reset. Honeywell Thermostat Permanent Hold Explained: What & How to Use>Honeywell Thermostat Permanent Hold Explained: What & How to Use. Put the negative battery pole with the minus sign on the plus sign in the battery compartment. Then, turn off the breaker on your electrical panel. Older thermostats rely on mercury switches, which need to be level. old V+/Vg carrier thermostat with Honeywell >Replacing old V+/Vg carrier thermostat with Honeywell. Battery Replacement in Honeywell Thermostats: All Models Guide. How Do I Check a Honeywell Mercury Thermostat to See if It Is. If the thermostat is not level, your problem can be solved with a few simple tools in about 5 minutes. Go to your thermostat and switch from Heating to Cooling and then feel the temperature of the air blowing from the vent. Honeywell Thermostat Manuals / Honeywell Home Support Center FIND THE USER GUIDE FOR YOUR THERMOSTAT First, lets identify your device Select the product. KNOW YOUR MODEL NUMBER? Search for your product name or model number to select your product from the options that appear below. All Honeywell thermostats that have batteries store the batteries in the control panel. Honeywell pro series thermostat that’s>How to unlock a Honeywell pro series thermostat that’s. When the air temperature around the thermostat changes, the coil rotates and tilts the mercury bulb one way or the other. Honeywell home pro series, thermostat is in…>I’m installing a Honeywell home pro series, thermostat is in…. Warning Standard thermostat use low-voltage (typically 24 volts) wiring that is very thin (18-gauge). Honeywell Thermostat Manuals / Honeywell Home Support Center FIND THE USER GUIDE FOR YOUR THERMOSTAT First, lets identify your device Select the product you’re having trouble with from the options below. To use a Honeywell thermostat, start by setting the correct time and date, since many of your thermostat settings will follow the clock. Many programmable and smart thermostats need a third wire — called the common, or C wire — to supply power for their various functions. There should be an option that says “reset to factory settings. (I ended up putting the Trane back on for now) Current Trane Terminals: O - Orange R - Red T - Black G - Green Y - Yellow X2 - Black B - Blue. Honeywell Mercury Thermostat. To reset the battery on a Honeywell thermostat, first ensure that the thermostat is turned off. Honeywell Home>Product Support and Resources. Older thermostats rely on mercury switches, which need to be level. To set the thermostat, simply turn the dial clockwise to raise the temperature setting or counterclockwise to lower the temperature. 44K subscribers 2M views 4 years ago This video shows you step-by-step instructions on how to. The Honeywell Thermostats 6000, 7000, 8000 & 9000 series. Wait about a minute, and then turn both back on. This wire goes to the G terminal on your new thermostat. The thermostat connects to the home Wi-Fi from the thermostat menu. This video goes over what each of the buttons does, how. Remove the cover from the old thermostat and take a picture of the wires with your phone (you’ll see why in a sec). Green – The green wire connects to the fan. These are non-programmable, mechanical (not digital) thermostats. Honeywell Thermostat Manuals / Honeywell Home Support Center FIND THE USER GUIDE FOR YOUR THERMOSTAT First, lets identify your device Select the product youre having trouble with from the options below. With the wake time set, you will now have to set the wake temperature. Scroll down and touch Wi-Fi Setup. Y2: This is for the wire that controls second-stage cooling. Press set or program again to set a temperature. How to Change the Temperature on a Honeywell …. To use a Honeywell thermostat, start by setting the correct time and date, since many of your thermostat settings will follow. How to Troubleshoot a Honeywell Thermostat Not Working?. Carefully extract the batteries, and replace them. Use our tool to determine which thermostats work with your home’s existing wiring. Already own a smart thermostat?. Honeywell Thermostat Manuals (All Models). These are old Honeywell thermostats. 4,631 Satisfied Customers Expert André R. Connect the wires to your new Honeywell thermostat in the same way. #1 Answer grayfurnaceman 53K views 7 years ago HOW TO: Installing a NEST Thermostat (2nd Gen) The How To Husband 140K views 6 years ago How To. Many programmable and smart thermostats need a third wire — called the common, or C wire — to supply power for their various functions. Of the Y, Y1, and Y2 wires, Y or Y1 go to the Y terminal and Y2 to the Y2 terminal. Here are some quick tips on resetting the factory setting to most Honeywell thermostats: 1. is online now Related HVAC Questions The unit will not unlock, it is a pro series and is probably It started today. The thermostat will hold this temperature until the start of the next scheduled time period. Honeywell Home, Lyric Thermostat, initial problems: 1) Received fault of offline 2) No illumination of LED display and 3) No Heat or A/C blowing removed the display a read more. You can make the 3 wire cable work but you wont have the ability to control the fan manually. The reset button is located inside a small hole on the front panel of the thermostat and to the right of the buttons. See current status of Resideos mobile applications below Resideo – Smart Home Total Connect Comfort App NOT THE DIY TYPE? Contact a local professional partner. How to program a programmable Honeywell or any brand thermostat. Red – Now, there can be two separate wires for this. If we recommend placing a wire in a terminal, do not move it to another terminal if we address it later in the guide. How to Use a Honeywell AC Control Press the + or - button to temporarily select a new desired temperature. Now for the thermostat, connect: Red > R. How to Wire a Honeywell Thermostat. It will then prompt you to select another temperature value. Use the scroll buttons to move to RESET. To set the thermostat, simply turn the dial clockwise to raise the temperature setting or counterclockwise to lower the temperature. Remove the thermostat from the mounting plate. Position the new thermostat’s backplate roughly where the old backplate was. With newer models with touchscreens or the ones which can be remotely configured via an app, you press the “+/-“ or the “up/down” buttons to change the temperature. With a pencil, mark the openings for screws so you can easily drill in the right spots. Disconnect the wires and remove the old. To set the thermostat, simply turn the dial clockwise to raise the temperature setting or counterclockwise to lower the temperature. Follow steps with analog thermostat by turning the heat up or AC down and waiting a few minutes to see if it kicks on. C wire adapters are available here. That tilts the mercury bulb inside the thermostat in one direction or the other depending on the temperature. The Honeywell mercury thermostat has been a standard in homes and businesses for decades, but most of these old non-programmable thermostats have been replaced with basic digital thermostats or smart thermostats. The thermostat connects to the home Wi-Fi from the thermostat menu. Pros do more than just swap an old thermostat for a new one – you could also bundle in any of the following work: Service your HVAC system Run new wires, including a C-wire if you need one Move your thermostat to a new location Other electrical work around your house. You can make the 3 wire cable work but you wont have the ability to control the fan manually. Intro How to program a Honeywell Thermostat Andrew DIY 21. Press and hold down the MENU button for 5 seconds 3. Was this article helpful? Yes No CONTACT US MESSAGE US. Contractors Assistant: How long has this been going on with your Honeywell thermostat? What have you tried so far? I hooked up the wires and it was running, but I can’t seem to adjust the temperature or get it back on. Continue to hold it until it reads done. With newer models with touchscreens or the ones which can be remotely configured via an app, you press the +/- or the up/down buttons to change the temperature. Hold it down for approximately five seconds. Troubleshooting a Smart Thermostat. If you feel it’s not working, try these steps: To check your furnace, make sure the switch is set to “HEAT,” and turn the temperature setting up to 80 degrees. Green – The green wire connects to the fan. To use your Honeywell thermostat, start by reading through the instruction manual. We tried resetting it with changing the - Answered by a verified HVAC Technician Do you know the model of your Honeywell thermostat? How old is it? TH6220u2000. Enter in any personalized settings or programs that you wish. To clear the schedule on a Honeywell thermostat, all you need to do is press and hold the HOLD button. Thermostat Wiring for Dummies – How Anyone Can Do It. Old Honeywell thermostats with mercury bulbs are most commonly small and round, giving them the nickname of Honeywell round. Thermostats Security Air Quality Water Leak Detector Apps. Spend some time looking over the keypad and display. Continue pressing the mode button until you find the desired option to change. I have a heat-only natural gas furnace with a fan. Method 1 Familiarizing Yourself with Your Thermostat. 44K subscribers 2M views 4 years ago This video shows you. Remove the thermostat from the mounting plate. Here is the system function map - so if your wires are correctly colored and connected - it should be pretty clear to map it across. To use a Honeywell thermostat, start by setting the correct time and date, since many of your thermostat settings will follow the clock. With older manual thermostats, the easiest way for homeowners to check for an improper installation is to locate a level. To set the thermostat, simply turn the dial clockwise to raise the temperature setting or counterclockwise to lower the temperature. If this does not work, you might have a faulty thermostat. 6M views 9 years ago Venmo Tip Jar @AndrewDIY This is a pretty standard process for thermostats even if they arent. Disconnect the. Touch the mode button on the left side of the thermostat to modify system settings. Attached are two photos, the first showing the existing thermostat with the control wiring and a second photo showing the Honeywell thermostat that I tried connecting to. Enter the Wi-Fi password and Touch Next. Pull the wires through the opening on the backplate before adhering the backing to the wall. If you have a manual thermostat, there is a small chance that you will have this option. X or AUX: If your new heat pump features an. When the air temperature around the thermostat changes, the coil rotates and tilts the mercury bulb one way or the other. When it tilts enough, depending on the thermostats temperature setting, the mercury moves to one end of the bulb so that is makes a connection between the two wire contacts, allowing electricity to flow between them. After removing and labeling all wires, unscrew the old thermostat wall plate and mount the new thermostat’s wall plate. If the thermostat is not level, your problem can be solved with a few simple tools in about 5 minutes. Wi-fi-enabled Honeywell thermostats, such as the Lyric 5 and T6 thermostats, can be programmed using the touchscreen on the face of the thermostat or using the wi-fi thermostat app on your phone. Troubleshooting a Honeywell smart thermostat is similar to a programmable one, so you can follow many of the same steps. Check Compatibility APP STATUS Your issue may be related to a system outage on one of our applications. Remove the cover from the old thermostat and take a picture of the wires with your phone (you’ll see why in a sec). My old thermostat only has two wires (V+ and Vg), which go to a controller panel by the furnace which sends Rc, W/W1, G, C, and Y1 to the furnace. Solved: Honeywell Thermostat Not Working. Honeywell 8000 Series: If your Honeywell thermostat falls under this category, press the “system” button on the screen. Touch the Temperature tab, then set the heating or cooling temperature you want. If you do, it will be a “Set Clock/Day” button that you can press. Intro How to program a Honeywell Thermostat Andrew DIY 21. If you have a C wire, place it into the C terminal on your wall plate. Honeywell Home, Lyric Thermostat, initial problems: 1) Received fault of offline 2) No illumination of LED display and 3) No Heat or A/C blowing removed the display a … read more. Old Honeywell thermostats with mercury bulbs are most commonly small and round, giving them the nickname of Honeywell round. Let the furnace run for two to three hours and, if necessary, repeat the above adjustment. These devices can generally be grouped into the following categories. Converting from Honeywell PC8900 wiring to conventional. 6M views 9 years ago Venmo Tip Jar @AndrewDIY This is a pretty standard process for thermostats. I will mark this as answered so the question does not time out, but feel free to follow up if needed. Touch the Select tab, but dont let it go right away. If none of these work, it may be time to call an HVAC repair company. Disconnect the wires and remove the old thermostat baseplate. Honeywell Thermostat Not Working After Battery Change (Top 4. After removing and labeling all wires, unscrew the old thermostat wall plate and mount the new thermostat’s wall plate. I need help with installation I need help programming my thermostat I want to replace or buy a new thermostat My device isn’t working I need to find a manual T9 and T10 Firmware Update. Check the mode and temperature If the heating/cooling system does not respond to your Honeywell thermostat, there might be a problem with the selected mode. Touch the Menu from the thermostat Main screen. After you select the new temperature, Temporary Hold will flash on the screen. Attach a picture of control board with panel off furnace. If you have one of the earlier Honeywell models, you press the hold button and set the temperature you require. W2: If you upgrade to two-stage heating, you need this terminal to control the second stage. Ask Your Own HVAC Question Related HVAC Questions. If you want the fan without heat or air conditioner, turn it On. How To Easily Program a Honeywell Thermostat The Amateurs Amateur-If I Can Do It You Can Do it 7. How Do I Check a Honeywell Mercury Thermostat to See. If you experience any problems, reach out to Honeywell customer service or contact an HVAC expert. Turn the fan to Auto to make it come on when the furnace or air conditioner does. If the unit is rectangular, like the Honeywell CT53K1006, the dial is often. Orange – This wire connects to your heat pump (if you have one). Ask Your Own HVAC Question We must determine why we have lost our 24 volts to the thermostat. My Honeywell Thermostat model #TH6220WF2006 is completely…. Here is the sequence of colored wiring coming from the thermostat to the board: Red wire spliced and connected to new Red wire secured to the R slot. Remove the cover from the old thermostat and take a picture of the wires with your phone (you’ll see why in a sec). The next step in setting your Honeywell thermostat is to set the time and date. Again, you can use the up and down arrows to cycle through the time. Honeywell Thermostat Manuals / Honeywell Home Support Center FIND THE USER GUIDE FOR YOUR THERMOSTAT First, lets identify your device Select the product you’re having trouble with from the options below. If the room temperature is either too hot or too cold for long periods, move the lever closer to the “longer” setting by one calibration mark. How to unlock a Honeywell pro series thermostat that’s Does that look like its working? Customer attachment 4/29/2023 2:18:40 AM André R. How To Work Honeywell Thermostat OldHow To Easily Program a Honeywell Thermostat. If your thermostat doesn’t match your findings, then the temperature sensor is probably malfunctioning. Time Switch – Simple device that provides the ability to turn on/off or boost your heating. Turn ON the thermostat and the circuit breaker. Attach a picture of control board with panel off furnace. The button should lead to left scrolling. How do I change or reset the WiFi connection. How to program a programmable Honeywell or any brand thermostat. 44K subscribers 2M views 4 years ago This video shows you step-by-step instructions on how to. , the positive end of the battery on the negative side and vice versa. Go to your thermostat and switch from Heating to Cooling and then feel the temperature of the air blowing from the vent. When you press the hold button, the thermostat clears all the temperatures you had set. How To Easily Program a Honeywell Thermostat The Amateurs Amateur-If I Can Do It You Can Do it 7. Converting from a Trane XT500C AC Thermostat to Honeywell. Old Thermostat>6 Things To Know Before You Upgrade Your Old Thermostat. Most programmable thermostats have very similar options and settings. 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. These are non-programmable, mechanical (not digital). The O/B wire can have many configurations. How To Easily Program a Honeywell Thermostat The Amateurs Amateur-If I Can Do It You Can Do it 7. When the thermostat is set to heat, and the temperature gets cold, the bimetal moves, and the bulb tilts causing the mercury to slide in the bulb to complete the circuit and call for heat. One is for cool and the other is for heat, hence the abbreviation “RH” and “RC”. honeywell thermostat control. Honeywell Programmable Thermostat Manual for Troubleshooting Step 1 – No Life Signs on the Display Honeywell digital thermostats share one common problem. Ensure that your thermostat is turned off. Be sure to place the batteries in the correct orientation. Then you can use the arrow keys to set the date and time. If you have an older thermostat that is either round or square and you adjust the temperature by turning a knob or moving a small lever, you have an analog thermostat. Most programmable thermostats have very similar options and settings. Honeywell Thermostat model #TH6220WF2006 is completely…>My Honeywell Thermostat model #TH6220WF2006 is completely…. How to Use the Override on a Programmable Thermostat. The thermostat will have a glass tube with a silver liquid inside of the tube. Honeywell has produced a multitude of thermostat types over the last 50 years. Replacing a Trane Thermostat with a Honeywell Thermostat. Mercury thermostats are simple and long-lasting, but, like all thermostats, they can develop problems in the wiring or internal components of the unit. Contact Support at 1-855-733-5465 to find a pro-installer in your area. Gently press the side of the thermostat to retrieve the battery compartment Remove the depleted batteries and replace them with the new ones Pay attention to the positive and negative terminals Reinsert the battery compartment and turn on the thermostat. Thermostats that control baseboard heaters or other electric heaters often use line voltage (120 or 240 volts) and have standard (12- or 14-gauge or larger) wires. Honeywell Vertical Thermostat; after several years are no longer energy efficient. Use a sharp object (toothpick, paperclip, or pin), put it in the hole, and press the button for about 5 seconds. Use our tool to determine which thermostats work with your home’s existing wiring. Intro How to program a Honeywell Thermostat Andrew DIY 21. If you have an older thermostat that is either round or square and you adjust the temperature by turning a knob or moving a small lever, you have an analog thermostat. Align the positive battery pole with the plus sign on the negative sign in the battery. How to unlock a Honeywell pro series thermostat that’s Does that look like its working? Customer attachment 4/29/2023 2:18:40 AM André R. Install the baseplate for the new thermostat. Put the batteries back on in reverse to the indicated polarity by the markings in the battery holder. Next, adjust your general setting to Heat if you want the heater turned on, Cold if you want AC, and Off to switch off the system. Step 2 – Bring Out the Room Thermometer. If the display of your thermostat is not on or is fading, your device. This video goes over what each of the. Follow steps with analog thermostat by turning the heat up or AC down and waiting a few minutes to see if it kicks on. If your Honeywell thermostat is not working despite saying its currently heating or cooling then try out the following troubleshooting steps. Insert a coin or something similar into the slot or by pushing it in and then sliding out the compartment door. I’m installing a Honeywell home pro series, thermostat is in…. However with out your make and model of AC / Heating unit - there is no certainty that your new thermostat is compatible. This wire goes to the G terminal on your new thermostat. If the problem persists, you may need to replace your thermostat. Remove the thermostat cover and remove the batteries.