The thermostat conditions the indoor climate - the AC, the heat pump or the furnace - to generate the desired temperature. area where there are constant power failures. Step 3: Replace with new battery. Simply pull the plastic tab out of the thermostat. Press and turn 60°clockwise. The unit instructions indicate that a warning will advise of low battery power around 120 days before failure. Granted, each heating and air conditioning system will have unique requirements for connecting a new thermostat, but the general process is pretty much the same. It is easy to setup, plug it in to the mains and your router, pair it with the thermostat, download the app, create an account with Honerywell and the device to your app. Remove the old wallplate from the wall. An electronic thermostat basically runs on an automatic switch. View and Download Honeywell PRO PRO TH4000 operating manual online. FREE next day delivery available, free collection in 5 minutes. The new thermostat that you are looking to buy has a receiver, which is normally mounted near the boiler or wiring center for boiler controls. • T7300A is a fully configurable programmable commer-cial thermostat to be used with a Q7300 Subbase. I have a Goodman furnance and a Janitrol HPT 18 60 thermostat and want to replace it with a Honeywell digital thermostat. With that, I hit the local Lowe's and picked up a new Honeywell (guess they've got quite the corner on the market) and began the installation. You don't need to take the thermostat off the wall to do this. The thermostat conditions the indoor climate - the AC, the heat pump or the furnace - to generate the desired temperature. Inspect the old thermostat wiring. Popular Thermostat & Honeywell videos Old Honeywell T8601D How to Replace the Battery in Honeywell "Round" Thermostats. Although the thermostat has a low battery indicator, replace the batteries once a year to prevent the thermostat and heating/cooling system from shutting down due to a lack of battery power. This likely a heat only thermostat that is either digital or non-digital. Undo the retaining screw B and remove the back of the push. The Honeywell Pro TH3000 is a thermostat designed to regulate domestic heating and cooling systems. Carrier offers thermostats and controls for the highest degree of climate control, from temperature to humidity, while staying energy efficient. In theory you could mount the receiver where the existing stat is, but in my opinion would be better back at boiler/wiring centre. You’ll refer to this later when connecting the wires to your new thermostat. Installation and Performance. Contact the Thermostat Recycling Corporation at www. If the old thermostat had both O and B wires, attach the B wire to the C terminal. FocusPRO™ TH6110D Programmable Thermostat 7 Installation Guide 6 AC Power The thermostat can be powered by 24 VAC power,or by batteries. The Pro TH3000 uses an AC power supply, but you can install batteries as a source of. If you have more than five wires then you have more control points or you have a heat pump. Honeywell TH5110D1006 Honeywell Non-Programmable Thermostat, Up To 1 Heat/1 Cool. But check your owner’s manual…if your thermostat isn’t built this way, you’ll break it!. Im looking to replace my old non programmable thermostat (honeywell t451a), with a 7 day programmable. RE: How do I change the batteries in a Honeywell wall mounted thermostat? What kind of battery does this unit take? I can't figure out how to get the cover off. If you want the power to control your thermostat with your smartphone and save money on your electric bills then installing a smart thermostat is the way to go. How do I change the battery in a Honeywell Thermostat. What's really great about this unit is the programming function and Honeywell have aptly named it the 5-1-1. If anyone has any experience replacing a Dometic CT Thermostat model 3316410. a brown color, an orange color and a blue color wire. When I went to install the unit my wires didn't match with the directions. Only difference in the wiring was the need for the C line 24V. Honeywell RTH2510B1000A Thermostat, White Best Temperature to Set Thermostat in Summer and Winter | Fatherly EPA clarifies stance on thermostat settings after 78. Then, fasten the new thermostat to the wall plate by pushing it gently until it snaps in place. PRO PRO TH4000 Thermostat pdf manual download. Granted, each heating and air conditioning system will have unique requirements for connecting a new thermostat, but the general process is pretty much the same. Popular Thermostat & Honeywell videos Old Honeywell T8601D How to Replace the Battery in Honeywell "Round" Thermostats. It has a minimum voltage requirement of approximately 20 volts AC with a maximum of 30 volts AC, at 60 HZ. Mount the electronic interface module (receiver) to the wall beside the boiler. In case any of you ever find yourself needing to replace an old thermostat, I've documented the steps below, with photos, on how I replaced my old one with a Honeywell Lyric. I read some reviews panning the lack of adjustment for the thermometer, and the inability to change the 10-year lithium battery. The batteries are located on the right side of the thermostat. It is probably a coin cell , if so it will look like a 10p peice. Inspect the old thermostat wiring. Honeywell do provide some adapters which must be ordered separately to fit some of the alternatives (ACH28, M28 1. Check the wires coming from the transformer. Turn off power at the heating and/or cooling system or fuse/circuit breaker panel. The wireless thermostat consists of two parts, a thermostat and a receiver. Remove the cover of your old thermostat (Fig. It took quite a bit of force to remove the faceplate and I had to use a flat screw driver. Insert 2 fresh AA batteries and then reinstall battery holder. Asked by Honeywell Support August 15, 2013 Answer: The thermostat you reference in your question is a Honeywell CT87N. For example, if the battery in a door sensor is dead, it won't tell the system when the door is opened. This message will clear after you replace the battery. Contact the Thermostat Recycling Corporation at www. Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old thermostat. MERCURY NOTICE If you are replacing a thermostat that contains mercury in a. The old WeatherTron was also really ugly. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Replace your thermostat just like it the old one was positioned. Here are the steps to follow when replacing a thermostat: 1. You are now ready to replace the battery of your Honeywell keypad. Can you advise if this is a direct replacement and is the wiring likely to be the same. Failure to follow these instructions can damage the product or cause a hazardous condition. This is from the T4 Pro thermostat manual on pages 6 and 7. need to know how to change batteries. if it's a modern thermostat you would want to save the settings in a power outage and the current draw is so low that a 9V will last a long time. Insert 2 fresh AA batteries and then reinstall battery holder. This Site Might Help You. Also for: Th4210d1005, Th4110d1007 - digital thermostat, 1h, Th4110d, Th4210d, Pro th4110d, Pro th4210d. Always turn off. Press and turn 60°clockwise. I wanted to replace them with a digital thermostat. 6v Ni-MH cell as made by Varta. This Site Might Help You. Remove the screws and carefully pull the thermostat off of its mounted position. A load test is required. This CT87K heat only model provides precise accurate performance with the ease of use that you've grown accustomed to - simply turn the dial to desired temperature and let the thermostat take over. Working around electricity can make anyone a little anxious, and some homeowners might get nervous if they need to replace a thermostat. of this thermostat to Honeywell Consumer Services at 1-800-468-1502, Monday-Friday, 7:00 a. The best WiFi thermostat will come with features like intuitive schedules, automatic temperature changes when you’re away from home, and live weather updates. Honeywell Programmable Thermostat Troubleshooting Low Battery Honeywell 5-2 Day Programmable Thermostat. The place isn’t insulated very well and the summer has been hot so we have been getting some big electric bills because of our air conditioning. If you have a digital Honeywell thermostat, it will likely have a monitor to notify you when the battery is. Step #1: Remove the thermostat from the wallplate. It is not exactly easy but it is possible. Install a programmable thermostat and save between 5% and 15% on your monthly heating and cooling bills. The early 1950s-era gold-painted metal. So you just went out and bought a smart thermostat, and now it’s time to install it. I love these thermostats. Set point retained in memory (in the event of power outage) One-year warranty. MERCURY NOTICE: Do not place your old thermostat in the trash if it contains mercury in a sealed tube. MERCURY NOTICE If this thermostat is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Therefore, it is important that you make sure that you have a c-wire and that your HVAC system is compatible with Honeywell' s thermostat. Thermostats manufactured before. and up and down arrows so you can change the temperature manually. RV Thermostat Upgrade Honeywell FocusPRO 5000. A programmable thermostat lets you customize the heating and cooling of your home to your needs, ensuring the heat and air conditioning aren't running when you don't need them. Alerts If there is an alert or reminder, the alert icon appears on the Home screen. MERCURY NOTICE: Do not place your old thermostat in the trash if it contains mercury in a sealed tube. View and Download Honeywell PRO PRO TH4000 operating manual online. I can't figure out how to get the cover off. To be on the safe side, it's best to replace batteries within two weeks of the low-battery notification. " It sho. replacing old honeywell room stat to a new white one three wires at honeywell(not incl earth which is to back box) wires are red blue and yellow red was. Thermostat wires are low voltage, but it's always advisable to turn off power running to the unit before disconnecting the wires. 9 hours ago · Find many great new & used options and get the best deals for Honeywell RTH9585WF WiFi Smart Color Thermostat at the best online prices at eBay! Free shipping for many products!. Popping off the old thermostat wasn't any trouble but I did have to be careful because it has in it a vial of liquid mercury that, if broken, could cause some serious cancer. com Non-Programmable RTH3100C Digital Thermostat Installation is Easy 1. If possible, keep the system transformer plugged into the wall outlet during this process. Q: I have a Honeywell ST699 that is 28 years old. 2) Other thing: The unit is very difficult to open to install or replace batteries. my boiler type is Ideal logic 24. On a programmable Honeywell thermostat, lift the thermostat cover outward from the bottom. The digital front needs a battery and then it connects into the panel attached to the wall which is connected to the furnace. In this video, This Old House plumbing and heating expert Richard Trethewey helps a homeowner install a wireless thermostat to control one zone of heating. To Mount Thermostat Align the 4 tabs on the wallplate with corresponding slots on the back of the thermostat,then push gently until the thermostat snaps in place. Its mission is to turn your AC on and off at certain temperatures. Tools Required: Basic Electricians Pouch Hand Tools. In theory you could mount the receiver where the existing stat is, but in my opinion would be better back at boiler/wiring centre. I'll skip the description of the wiring of the a/b switch I'll set up by the boiler. Help Replacing my old Honeywell T87 Thermostat with programmable Touchscreen? Ok So i posted a question about this earlier but I missed some key points. Then there is the slide for the temperature control. FAILURE TO Your new White-Rodgers 5-Day/1-Day/1-Day Digital Thermo- This thermostat is intended for use with a low voltage system, do To replace. Purchased this to replace old dial thermostat. If you want the power to control your thermostat with your smartphone and save money on your electric bills then installing a smart thermostat is the way to go. Thermostat E just installed. a brown color, an orange color and a blue color wire. battery from discharging during shipment and storage, the UtilityPRO is shipped from the factory with a plastic tab inserted in the battery holder. You can set your system for one temperature when you're at home, and another when you're away. Any suggestion? Thanks very much! What is wrong or why the change of t-stat? What do you have for back up heat? Thanks for your response. Electronic Thermostats – Honeywell Thermostat Cool On Flashing and Battery Check. Honeywell TH5110D1006 Honeywell Non-Programmable Thermostat, Up To 1 Heat/1 Cool. The location of the test button will vary. Replace your thermostat just like it the old one was positioned. I am a little confused about the battery replacement procedure. • Install and wire your new thermostat (see pages 9-16). (Adhesive labels are supplied in your thermostat package. We presented the utter variation of this ebook in doc, txt, ePub, PDF, DjVu forms. How to change thermostat or replace Ac thermostats. Thermostats manufactured before. " It sho. Order online at Screwfix. However, Honeywell's Pro versions of the same thermostats do run on 24VAC with battery backup. Call the Honeywell technical support line or refer to the thermostat's manual for exact reset instruction for a particular model. Do not remove the wires. Honeywell RTH2300 Thermostat Installation Instructions We are living in a modular home that still has the original thermostat. To prevent wires from falling back into the wall, wrap the wires around a pencil. 5 If the burner does not ignite, check the continuity of the wires from the thermostat to the furnace. ), number of heating and cooling stages, and fuel source (gas, oil, etc). Can you advise if this is a direct replacement and is the wiring likely to be the same. Replace the CR2032 coincell battery. Remove your old thermostat and take a picture of the wires. In order to change the battery in the Libra + Landscape push button please follow the steps below: Using a ball point pen, press at point A and remove the name plate. Yet another thought is I might leave my old Honeywell Mercury thermostat and its wiring in as a backup. 5 volt, alkaline batteries. Yes, its battery powered by some sort of quarter size flat disc battery sealed up in there. Power options & mounting. • Install and wire your new thermostat (see pages 9-16). An electronic thermostat basically runs on an automatic switch. On a programmable Honeywell thermostat, lift the thermostat cover outward from the bottom. Lux produce a video to demonstrate the installation process. To Mount Thermostat Align the 4 tabs on the wallplate with corresponding slots on the back of the thermostat,then push gently until the thermostat snaps in place. How to Clear Schedule on Honeywell Thermostat? Push the "Set" button 3 times until the message "Set schedule" appears on the screen. It was a 5 minute job. There should be screws / or / it will just pry off the mounting base (not the wall). Then there is the slide for the temperature control. ) Remove the old wallplate only after all wires are labeled. MERCURY NOTICE If you are replacing a thermostat that contains mercury in a sealed tube, do not place your old thermostat in the trash. Remove the cover of your old thermostat (Fig. To wire the thermostat for AC power, connect the common side of the cooling transformer to the "C"terminal as shown at left. Contact your local waste management. Best Answer: You didn't say what model of thermostat. In the case of the Honeywell FocusPRO 5000, it uses a pair of AAA alkaline. Why is the thermostat flashing after I change the battery? How do you replace batteries in a round standard Honeywell Thermostat CT87K for 448? The batteries in my thermostat went dead. Remove the cover from the old thermostat. An electronic thermostat basically runs on an automatic switch. Below we've simply popped off the thermostat face. Contact the Thermostat Recycling Corporation at www. How come there were no wires coming out of the back of the thermostat? I need to know where to connect the thermostat wires from the wall. Remove Old Thermostat 1. STEP 3 Disconnect wiring Most wiring is mounted to a thermostat with a screw and nut. Volia! And dude relax. Install a programmable thermostat and save between 5% and 15% on your monthly heating and cooling bills. There should be screws / or / it will just pry off the mounting base (not the wall). Honeywell and just about any other thermostat manufacturer will give you a set of stick-on labels that you should use to indicate not the actual color of the wire but the ID of the thermostat terminal to which the wire was connected on the old thermostat. com Non-Programmable RTH3100C Digital Thermostat Installation is Easy 1. Then remove your old thermostat cover. How to change the battery on my thermostat Honeywell t8001c The battery is inside the thermostat. Installing a Digital Thermostat I bought two digital thermostat at Lowe's, not knowing that the thermostat upstairs required a thermostat that has some kind of pump. If another wire is attached to the C terminal, call 1-800-468-1502 for help. Honeywell Home T9. Non-sliding Wall Thermostats. If possible, keep the system transformer plugged into the wall outlet during this process. 99) is a feature-packed smart thermostat that uses remote room occupancy sensors to ensure uniform heating and cooling throughout your entire home. There are many models of Honeywell thermostats with different battery. Inspect the old thermostat wiring. Remove the cover of your old thermostat (Fig. I was able to change the downstairs thermostat, but when I tried to do the upstairs I had no success. "I had bought a thermostat device 11 moths back, Suddenly the device has stopped responding properly, Sometimes the display goes out and nothing is shown on the device's display screen, My friends have recommended me to change the battery of the thermostat device. Therefore, it is important that you make sure that you have a c-wire and that your HVAC system is compatible with Honeywell' s thermostat. Check the number and type of wires attached to the old thermostat. Honeywell technical support information, product brochures and more. Change your wall thermostat batteries once a year,. There should be screws / or / it will just pry off the mounting base (not the wall). airtreatmentinc. Purchased this to replace old dial thermostat. TWO SINGLE-STAGE SYSTEM TRANSFORMERS FAN APPLICA- PLUS THERMOSTAT SUPPLY TRANS- FORMER SHOWN. Call 1-800-468-1502 for wiring assistance before returning. One labeled "system" with settings cool, off and heat. Read these instructions carefully. Easy-to-read display. Rang Honeywell and they say the battery cannot be replaced, they advised i should get a new progammable thermostat. So you just went out and bought a smart thermostat, and now it’s time to install it. Open as PDF or of an old control containing mercury in a sealed. I have an old house, the original furnace controller is this one (Honeywell Mercury one, see below) Just few months before, I replace the controller with this one (Battery powered, 2 AA inside, Hunter 42997, 24V compatible) My furnace only has 3 wires, and only 2 wires are really needed to turn on/off, The wires from the wall,. battery-powered: but I was able to change out our old one (different model that is. This information is easily found in the owner's manual, but the manual is often discarded after purchase. Honeywell TH5110D1006 Honeywell Non-Programmable Thermostat, Up To 1 Heat/1 Cool. Installing a Digital Thermostat I bought two digital thermostat at Lowe’s, not knowing that the thermostat upstairs required a thermostat that has some kind of pump. Replace the CR2032 coincell battery. The Hunter we had used AA, and they lasted about a. Popular Thermostat & Honeywell videos Old Honeywell T8601D How to Replace the Battery in Honeywell "Round" Thermostats. The Honeywell FocusPRO 5000 (TH5110D1006) fills the bill. I've got a Honeywell non-battery, non-programmable thermostat (number inside on a decal says T8400C 1008 (2)), and it's getting harder to get the up and down buttons to respond when pushed so that I can change the temperature setting. Honeywell’s been in the thermostat business a long time – and with that longevity comes the expertise needed to hold its own in the hot smart thermostat market. This is from the T4 Pro thermostat manual on pages 6 and 7. A programmable thermostat lets you customize the heating and cooling of your home to your needs, ensuring the heat and air conditioning aren't running when you don't need them. Popping off the old thermostat wasn't any trouble but I did have to be careful because it has in it a vial of liquid mercury that, if broken, could cause some serious cancer. How do i open the cover to see the type of battery For the air conditioning/furnance unit for cooling and heating. I would like to disable the hold button on a Honeywell T8112c1023(1) thermostat (5/2 programmable). Re: Honeywell 'The Round' CT87K battery question The CT87K is a power stealing stat (it powers it self from the r Terminal power) so I doubt the battery has anything to do with it's operation other than to keep the settings in case of a power interruption. This 5-2 day programmable thermostat is easy to use and offers features like a backlit display, precise temperature control and weekday/weekend Honeywell 5-2 Day Programmable Thermostat at Lowes. The battery of the thermostat keeps your programming saved and prevents your heating and cooling control system from turning off when the power goes out. This easier to understand guidelines is for low voltage residential thermostat. If you can get the cover off, then do so, see if there is anything that is obiously a battery. replacing old honeywell room stat to a new white one three wires at honeywell(not incl earth which is to back box) wires are red blue and yellow red was. Remove the cover from the old thermostat. Honeywell Home T9. 226c quality rs key old battery to be replaced may be 193933 or 193933a black union carbide battery (approximately 1-1/8 in. IMPORTANT: Replace the batteries once a year to prevent the heating/cooling system from shutting down due to lack of battery power in the thermostat. Check the number and type of wires attached to the old thermostat. A programmable thermostat lets you customize the heating and cooling of your home to your needs, ensuring the heat and air conditioning aren't running when you don't need them. If you are leaving home for longer than a month, change the batteries before leaving to prevent the system from shutting down due to lack of power. Easy-to-read display. a brown color, an orange color and a blue color wire. Wiring Guide for a Honeywell Thermostat Electrical Question #1: How do I connect the wires for a heater thermostat? I bought a Honeywell Heating thermostat. To replace the battery, remove the battery tray using a screw driver. You can’t use a low voltage thermostat (like Nest, Ecobee or other popular models used for furnaces or heat pumps) with a baseboard heater. From here on out, it's mainly a matter of reassembly -- the easy stuff. The best WiFi thermostat will come with features like intuitive schedules, automatic temperature changes when you’re away from home, and live weather updates. Unscrew and remove the old thermostat's mounting plate fromthe wall, but do not disconnect the wires. Important: Remove R/Rc jumper for 2-transformer systems only. Easy-access battery replacement. Installation and Performance. Honeywell's reliable and highly-rated app allows you to program your thermostat from your computer, tablet and smartphone, whether you're across the room or around the world. Criteria to Choose the right Baseboard Heater Thermostat. Just remove the old thermostat and wire the wires to the TX9600TS, fix to the wall and it is done. 25 to include one. However my old Thermostat was battery powered and does not use the "C" wire. Re: Honeywell 'The Round' CT87K battery question The CT87K is a power stealing stat (it powers it self from the r Terminal power) so I doubt the battery has anything to do with it's operation other than to keep the settings in case of a power interruption. MERCURY NOTICE: Do not place your old thermostat in the trash if it contains mercury in a sealed tube. Make sure the terminal screws are tight. For more than a century, homeowners have been depending upon Honeywell home comfort innovations. Honeywell Programmable Thermostat RTH2300B. shown here) or 195044. This product from Honeywell is aimed to increase your energy savings. your old thermostat. Honeywell Digital Room T/Stat With ECO Feature DT90E1012. my thermostat is set at 70 but the ac doesn’t kick on till temp is 74 or 75 degrees in the house, thermostat is 11-12 yrs old, ac blows fine once it turns on but it’s not turning on till 74/75, time to replace thermostat?. Excellent replacement. Start by opening up the Nest app and tapping on the settings gear icon in the top-right corner of the screen. Why is the thermostat flashing after I change the battery? How do you replace batteries in a round standard Honeywell Thermostat CT87K for 448? The batteries in my thermostat went dead. All in all, you get a thermostat that’s simple to use and keeps you comfortable. Honeywell technical support information, product brochures and more. I have a Grant Vortex Combi 21e and the current stat is connected via terminal blocks 25 & 26. would you please help to show me how to connect the Relay Box to the boiler. Q: I have a Honeywell ST699 that is 28 years old. Honeywell TH5110D1006 Honeywell Non-Programmable Thermostat, Up To 1 Heat/1 Cool. The thermostat shouldn’t be located over a lamp, over a TV, or near any heat source. Low Battery Warning 1 The batteries need to be replaced when BATT, the alert icon , and the battery icon. This video will show you how to replace the batteries in a Honeywell thermostat. How to Change the Batteries You should consult the owner's manual for your individual thermostat, because the proper procedure to replace batteries may vary by model and manufacturer. Read these instructions carefully. With that, I hit the local Lowe's and picked up a new Honeywell (guess they've got quite the corner on the market) and began the installation. The logic is the Mercury ones work well and never had issues, and they are hard to buy. If there are only two wires, the simplest solution is to get a replacement with a battery-powered display. Use three AA, 1. This likely a heat only thermostat that is either digital or non-digital. Honeywell has a couple of bonus features that add a splash of modernity. Remove Old Thermostat Fig. IMPORTANT: Replace the batteries once a year to prevent the heating/cooling system from shutting down due to lack of battery power in the thermostat. Honeywell warrants this product, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period of one (1) year from the date of purchase by the consumer. Once the thermostat becomes loose you can slide it up off the base. It comes with a 7-day programmable memory that can be used to reduce your energy consumption. To be on the safe side, it's best to replace batteries within two weeks of the low-battery notification. I had to remove the face plate and replug it back into the mount. You are most likely familiar with the old Honeywell thermostat, especially if you are looking to replace one. I replied that it was so you could still adjust the air conditioning even during a power outage. Honeywell Wi-Fi Smart Thermostat RTH9580WF Review Common functions are easily accessed via the Honeywell 9580’s touch screen display. These programmable thermostats allow. On Vista 15P, Vista 20P, and Vista 21ip systems, low system battery causes rapid beeping with a display of SYSTEM LO BAT or BAT without a zone number. Very easy installation, I am in no way technical and I managed to change from my old Honeywell thermostat (much older) just by taking a picture of how it was wired and matching the numbers inscribed on the old one to the new one. Read these instructions carefully. The Honeywell Chronotherm thermostat is described in this 1950's HONEYWELL THERMOSTAT GUIDE [PDF] produced by the Minneapolis-Honeywell Regulator Company, Minneapolis 8, Minnesota, (1950) reproduced from a Dodge building products catalog. The app allows you to save easy templates for common occurrences that you can use each day, like a sequence for leaving home to go to work or another as you're about to go to bed. Whether your current thermostat simply needs replacement or you’re upgrading for better energy efficiency, Honeywell *If used as directed. With most types, you pull the thermostat’s body straight out from its baseplate and find the batteries mounted to the back side of the body. The thermostat shouldn’t be located over a lamp, over a TV, or near any heat source. Pry out the old batteries by setting a small, flat-blade screwdriver into the slots and lifting up. Turn off power: At above left, here's the old thermostat that we're going to replace. The thermostat as you know is battery powered and requires no wires. Q: I have a Thorn EMI central heating controller that is 25 yr old and needs replacing, it is identical in looks and function to the Honeywell ST699B time controller. I was able to change the downstairs thermostat, but when I tried to do the upstairs I had no success. To Mount Thermostat Align the 4 tabs on the wallplate with corresponding slots on the back of the thermostat,then push gently until the thermostat snaps in place. Full-featured devices like the Prestige need power from a third wire, something best installed by an HVAC or electrical contractor. FPO app screen showing terminal configuration process R W Y G R W Y G 3 4 5 6. Rosen Twice a year when the clocks change between daylight and standard time, public service announcements and fire departments remind people to change the batteries in their smoke detectors. Most test buttons require you to press the button for a few seconds to engage the test. I assume that you mean an electronic programmable model. If replacing an existing thermostat: a. Replace the battery with a CR-2032 battery. Step 2: Remove the old battery. Rang Honeywell and they say the battery cannot be replaced, they advised i should get a new progammable thermostat. Without applying too much force you should be able to pry it open. You don't need to take the thermostat off the wall to do this. my thermostat is set at 70 but the ac doesn’t kick on till temp is 74 or 75 degrees in the house, thermostat is 11-12 yrs old, ac blows fine once it turns on but it’s not turning on till 74/75, time to replace thermostat?. Unscrew and remove the old thermostat’s mounting plate from the wall, but do not disconnect the wires. Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old thermostat. How do I change the battery in a Honeywell Thermostat. There should be screws / or / it will just pry off the mounting base (not the wall). Battery voltage can tell you if the battery is bad, but cannot tell you if the battery is good.