The Aux heating system should be turned off. what does a flame symbol mean on a White Rodgers thermostat? If the thermometer is reading a different temperature than the thermostat, the problem is likely with the thermostat . Check the following potential problems before moving on to other solutions. The display screen should be activated once you put it back on. You tape a glass tube thermostat to the wall about 2 or 3 inches from the thermostat. Speak directly with an agent for help with our products. Check if the inside is clean and look for disconnected, broken, or loose wirings. If you have just switched the thermostat from cooling to heating or heating to cooling, the thermostat will need a bit of time to adjust itself. When the valve handle is in line with the pipe, then its open. Look along the top of the thermostat and locate the button which reads press. If that didn't take care of the issue, the first step that you should opt for when your Honeywell thermostat is malfunctioning is resetting your Honeywell Thermostat.. Over time, Honeywell has released many thermostat models with different . Dead Batteries Monday through Friday: Verified Purchase Use for hot water heating. If you continue to use this site we will assume that you are happy with it. Recently added two more heating zones and was so please to be able to find these exact matches. How many Vineyard Vines stores are there? Once you have them paired, attach one pair to 24VAC (R) and the other to Heat call (W) on the thermostat. Well, theres no particularly fixed guideline. Solution: When you have low refrigerant in your heat pump system, you will need to call a licensed HVAC technician to come and verify the refrigerant charge and recharge the system when necessary. In most cases, your thermostat turns on the compressor and fan (Y and G terminals/ wires) during cooling. The most common reasons for such a problem are a dirty filter, thermostat malfunction, pilot ignitor, wrong settings, or low battery issue. Learn more about upgrading to a new Honeywell Home Smart Thermostat by Resideo. Foremost, confirm if the setting is on cool. 1,199 views May 6, 2020 Going through some of the verbiage in the Honeywell thermostat. These problems dont call for an alarm, but theyre quick to panic because many people are unaware of what they can do to get their thermostat back to its normal functional state.Your monthly utility bills could increase drastically and you could also feel frustrated if your thermostat isnt working as you expect. JavaScript is disabled. If your thermostats high limit switch has been tripped, this could mean that your HVAC system has poor airflow. What are the settings on a Honeywell thermostat? This wire provides power from the heating or cooling unit to the thermostat through low voltage. The thermostat is set to 20. Just a quick video showing you how to access the HVAC System Setting Switch. The display screen should be activated once you put it back on. 2. In delay mode, your thermostat protects your compressor and your entire HVAC system from damage. Comfort & Heating. I n the morning, heating up is being done very g radually. Your system should cycle on in five minutes but check the possible causes above for delay mode. You can set a lower temperature and change it to cool mode if you realize its in auto mode. Take control of your home comfort and save on energy costs with a range of Honeywell Home thermostats. The Red wire usually represents the 24-volt main power supply for the thermostat, White is for heat, Yellow is for cooling, Green is the indoor fan, while the C terminal stands for common ground. G wire fan. Open Hours: When you set a program for your temperature to be a certain amount, such as 74 degrees F at the time you get home from work, the recovery mode will start cooling your home down in advance. Verify these wires are firmly connected to the correct terminals. B/C I remember when it blinking it means the AUX is running. Four different kinds of cryptocurrencies you should know. If you just have an R wire, its responsible for powering your entire HVAC system (through the use of a transformer). We are working on it. When you switch on the Em Heat, your heater will use a backup method of heating your home when its really cold outside. It will be factory set to either the letter F or gas or oil. If your system uses gas or oil for heat, leave the switch in this position. Emergency heat is much more expensive to run, so its recommended when your system malfunctions and you need to stay warm until a repairman arrives. HEAT mode What does the snowflake on my thermostat mean? On a programmable Honeywell thermostat, the most likely reason is that the unit is in the program mode. Keep reading to get your Honeywell thermostat working like new again in no time! Another reason your Honeywell thermostat heat is not working could be wiring problems. We use cookies to ensure that we give you the best experience on our website. What should we do to improve this article? Why Wont My Honeywell Thermostat Turn Off? Best Heat Pump Thermostat Settings for Any Time of the Year. Call the Homeowner number above and select the 'Contractor' option. Contrary to popular belief, the letters do not correspond to wire colors, but rather are used to indicate the various function signals controlled by each wire. Before you start fixing your Honeywell thermostat, you need to go to the circuit breaker and disable the power to the thermostat. Press the Set Schedule button once. The addition of a fourth wire, either with an adapter or new wires, could act as the C-wire if properly wired to the furnace, Strip the red and white wires back about 1/4 inch at both the thermostat and the furnace ends. Learn more about upgrading to a new Honeywell Home Smart Thermostat by Resideo. 3 Best HVAC Companies in Owens Cross Roads, AL, Why Wouldnt a Mini-Split Be Heating? We use cookies to ensure that we give you the best experience on our website. jan. 15. You need no one to tell you the level of discomfort youll feel if your Honeywell thermostat wont turn on the heat during winter. If you get it wrong, the heat will run continuously. The cool on, heat on, snowflake or flame icon will be blinking if this is the case. On your Honeywell screen, press and hold the Home icon on the screen. Confirm the thermostat has been correctly configured for your system. Get free, zero-commitment quotes from pro contractors near you. Take the batteries out, put them back in backward. 9 Apr 2013. 15 Common Questions About Honeywell Thermostats. Are you a trade or supplier? The Wait message is a result of a safety measure designed to protect the HVAC Compressor from damage. You can turn the A/C temperature down to make it turn off or turn the heat temperature higher to make it turn off. Stay Informed. Monday through Friday:9am to 8pm CDT Is My Honeywell Thermostat Following a Schedule for Recovery? Check for possible causes if your thermostat is in delay mode. If the heat pump runs in cool mode with a call for heat, verify that the configuration setting for the changeover is set correctly for your system. HVAC systems typically have their own circuit breaker, so check the box to make sure the switch is on. Getting the best heat pump thermostat settings can also help put things in order. How. If you need to find a tradesperson to get your job done, please try our local search below, However, this is common when the power comes back on after an outage. 9am to 6pm CDT Please leave a message in the comments to tell us how you liked this article. The flame icon on the display of the thermostat displays when the thermostat is calculating whether it needs to bring on heat as well as when it is calling for heat. Check the inside of the battery compartment to know what voltage your batteries need to be. Environment DT92E, boiler fire, flame symbol Answer / Solution The boiler can only be powered if it receives a power supply. This delay protects your This is a common safety measure built into Honeywell thermostats. For a better experience, please enable JavaScript in your browser before proceeding. Remove the old base and screw in the new thermostat base. When your thermostat doesnt have enough power, it wont be able to start the cooling or heating process. It may not display this or other websites correctly. I switched that off and the cupboard where is is went quiet. What is the t8602 chronotherm IV programmable thermostat? Honeywell Thermostat Instruction Manuals. In most cases, your thermostat turns on the compressor and fan (Y and G terminals/ wires) during cooling. You can also get a smart homeroom sensor like the Honeywell Home Smart Room Sensor to help you make necessary adjustments. Though not advised, if you choose to solve a wiring problem yourself, be sure to flip the breaker first. HouseWeather.com is a participant in the Amazon Associate program and will earn from qualifying purchases. And heres why. Dakotah graduated from James Madison University with a BA in Media Arts and Design and currently resides in Virginia with her husband. Verify that the thermostat is switched to cool mode and has a cooling set point below the room temperature reading. This is a list of common questions to troubleshoot your Honeywell thermostat and get it back in great working order. The boiler shout have an on / off switch somewhere? If "wait" is in the screen or "cool on" is flashing - wait 5 minutes for the system to safely respond. I don't hear anything from the valve when I switch it on or off, except water flowing/stopping flowing. One of them might have tripped and will need to be reset. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. If your Honeywell thermostat displays Em Heat it is a sign that your emergency backup heat is enabled. The Furnace Is Not Igniting Ask Your Own HVAC Question Ask Your Own HVAC Question Ask Your Own HVAC Question Sequence of operation for your furnace is Thermostat calls for heat. This message indicates that the thermostat is waiting to activate the system. 9am to 5pm CDT. A fresh set of batteries typically lasts a year in a Honeywell thermostat. The performance of your Honeywell thermostat can be significantly affected by the installation. Also read also: Honeywell Thermostat Blank Screen [7 Fixes]. If you installed the thermostat yourself, verify that the thermostat is correctly configured to control a heat pump. To turn on the relative humidity control, you turn it clockwise. If you do not know whether your heat pump uses the changeover valve in heat or cool mode, call your professional HVAC contractor or the manufacturer of your heat pump. If it varies by more than one degree, you should calibrate it. You can now recheck the temperature for variances. But take note that if breakers continue tripping, there could be another issue with your furnace, and you need to call a licensed HVA professional to come and take a look at it. 2-wire settings. Explain that a plus symbol will increase the temperature while a minus symbol will decrease it. This means that it has reached the temperature you set the A/C on and is pausing until it reaches a higher temperature to turn back on and run producing cold air. Switch it on if necessary. Wait about 15 minutes after making an adjustment to set if it cuts off. According to your preferences you may choose throughout the 3 general types: manual, programmable, and smart or WiFi Honeywell thermometer. File 1. Shop All Products. A flashing snowflake indicates that your thermostat has entered delay mode, which is a safety measure for Honeywell thermostats. In case you don't know the specific model number we have also included images of each thermostat below to guide you. Its one thing for your Honeywell Thermostat to have issues, and its another different thing when its not working at all. What is the best way to reset my Honeywell thermostat? If this is so, it may be because you didnt insert the batteries correctly. Environment. There are a variety of reasons why your display might start blinking. Why does my thermostat say heat on but no heat? Reply. If heat is not working but you can feel air coming out of vents, the problem could be an incomplete or bad thermostat wiring. Saturday and Sunday: Leave the backward batteries in the thermostat for 5 seconds. Possible problem with wireless thermostat. Sorry, something went wrong. Open Hours: How does the chronotherm IV read the temperature? Often, the screen will show a low battery symbol prior to the batteries going dead. If you have an older Honeywell thermostat, consider replacing it with a newer model, especially if it is having problems and showing signs of age. Where you install your thermostat also matters. This can occur as a result of power loss or interruption. These equipment are must-have as they help you control and regulate the cooling and heating of your home to make you more comfortable in your own house. Monday through Friday:9am to 8pm CDT Make sure the furnace circuit breaker switches are on. Connect the white wire to the W terminal on the furnace and thermostat. Some models use a small metal jumper and other models have a switch that needs to be set to "R". Another common reason is if you didnt program all 7 days of the week on your thermostat. Auxiliary heat or emergency heat are the terms on different Honeywell thermostats that actually mean the same thing, although one is automatic and the other you can turn on. However, theres also a possibility that your Honeywell thermostat may not turn on immediately. In her spare time, she loves to use her creative spirit to complete her own home decor and DIY projects. If you continue to use this site we will assume that you are happy with it. If your A/C or heat is on and it seems to be way too cool or warm, respectively, then you can check your thermostat temperature. Honeywell manufactures some of the most dependable and popular options in standard HVAC thermostats as well as smart thermostats. If youre unsure of your model number, it is often located on the back of the thermostat. This is the switch which will allow you to change your HVAC over from Air Condi. If your Honeywell thermostat backlight is not working, it could be that your batteries are no longer providing power. Due to the variations in models, youll need to visit the companys official website or the owners manual to see the process you have to follow to reset your thermostat. That is why we've provided a powerful search function so you can find the exact manual you need. This delay is to protect your equipment from short cycling. Whatever heating control method is used, do not let staff bring their own electric heaters into work. If your Honeywell thermostat display is not working, you dont need to fret much because most times, it can be easily resolved. need to check the furnace power switch if it is on. Ive been a DIY homeowner with over 30 years of hands-on experience in all aspects of homes, including electric components of all types. This indicates that your HVAC system is in a delay mode. Open Hours: If there are no Why Does My Honeywell Thermostat Keep Changing Temperature? A teardrop or water symbol is used to show the DRY mode. If youve tried this option too and the button isnt responding yet, then you might want to consider replacing the button. This is because the difference in the outside and inside temperatures causes humidity to fog up your windows in your home. There could be a few reasons your Honeywell thermostat says heat on, but no heat is coming through. The GeniSys 7505 is used with a suitable cad cell flame sensor to control the oil burner motor, igniter, and optional solenoid valve. If your thermostat is connected to wall power, turn off the circuit breaker to cut power to the thermostat. Location. installation wiring for more info. Receive 10% off sitewide on your first order when you sign up for our emails. If you are using a thermostat that is battery powered, its possible that it can be saying heat on when your furnace is off. By the 18th century and especially the 19th . 1-800-633-3991 You are using an out of date browser. If the same issue occurred with the previous thermostat, then the problem is most likely with your heat pump. It's a reminder to service any filters on blowers. If the refrigerant is leaking out of your HVAC system, you will end up with little or no refrigerant in your heat pump system. The labels may have worn off the wires or you may not be able to see the markings on the metal component to which they attach. One of the downsides of Honeywell thermostats is that their batteries arent rechargeable. Push either arrow to display set temperature. Honeywell Thermostats If you have a blinking or flashing snowflake on your Honeywell thermostat, it means your thermostat is in delay mode. It can be a snowflake or it may say "cool on.". If your thermostat becomes disconnected from the Heat Link, there will be a red circle on the thermostat with an error code and a message that the thermostat can't connect to Heat Link. But when you experience these issues try out these tips before calling HVAC professionals. Sometimes when you dont have heat coming into your home, the problem could not be with your furnace or heat pump but with closed registers and vents. your Honeywell thermostat cool is on but not working, or whatever the case may be, the first step is that you shouldnt panic. If you installed the thermostat yourself, ensure that the wires are matched correctly and securely connected at the thermostat. https://www.youtube.com/watch?v=VknvJ9POYDo. Relax. If your Honeywell thermostat is not working after a battery change, ensure the doors are closed because if your HVACs access doors are still open, you may still have a blank screen. Youll need to call HVAC professionals for these issues to be fixed. equipment from short cycling. 9am to 6pm CDT Your heat pump does not produce heat. THR140, DT90, flame, thermostat. Thermostats do an incredible job! 2.Thermostats an overview | ScienceDirect Topics. Saturday and Sunday: 9am - 5:30pm CDT, Online Order Support and Customer Service If the batteries are dying, your thermostat could be blinking the Cool On message. And replacing one is a very common project, as homeowners swap out older thermostats requiring manual adjustment with newer programmable thermostats that change temperatures automatically at preset times. Select yes. These are not jumper wires, and you can insert the Rc wire into the Rc connector and the Rh wire into the Rh connector. Check the following potential problems before moving on to other solutions. Hence the lock symbol. If you are unsure of your settings, consult an HVAC repair professional before resetting your thermostat. 9am to 5pm CDT. Can you see the lever moving? You must log in or register to reply here. Daffodils and tulips make their early presence known, and of course, there is your Do You Need Your Thermostat Repaired or Reprogrammed? "Heat" "Heat On" Fire Icon Sun Icon If any of the above icons or message display on your thermostat without flashing, then your heat should be working. You have to ensure a proper alignment with the terminals when youre placing in the batteries. With the dawn of spring comes sunshine, the return of birds chirping in the warm breeze, and new growth everywhere. The question Are you sure? will appear. If you have a Honeywell thermostat, AA or AAA batteries should be your top choice. Select the supplier or trade you require, enter your location to begin your search. Close the furnace door and youll be surprised by how quickly this issues will get resolved. 1-800-664-2751 I run out to ask the technician before they go. A blank display could also mean your thermostat is at the end of its lifespan and needs to be replaced. All Honeywell thermostats, no matter the type of model, have a symbol showing you when the air conditioning is turned on. When you speak of thermostats, Honeywell has a wide variety of them, and you can delightfully choose any kind that catches your attention. However, if theres a problem with the heat of your thermostat, it could be due to these three reasons; You can know if your Honeywell thermostat fan is on but not working when you stand close to the vent to see if theres air coming out. W wire heat. Attach the new thermostat and add batteries to the base. 9am to 5pm CDT. Message us on Twitter for help with our products. It doesnt take long to tell a difference in the temperature of your home. Internal problems could be why your thermostat isnt responding. Quick Support Help. Maybe your Honeywell thermostat auto mode is not working, your Honeywell thermostat WiFi is not working. However, owning a thermostat is half the battle; maintaining and keeping it functional is more important. However, it is easy to miss. Homeowner Support There are a variety of reasons why your display might start blinking. Be sure and look at the links for instructions, diagrams, owners manuals, and videos on how to execute troubleshooting measures and fixes. Learn how much a Wi-Fi Thermostat could save you on your energy bills. Thermostat Honeywell T8195B Installation Instructions Manual Heating or cooling and heating/cooling new construction thermostat, wallplate and subbase (8 pages) Thermostat Honeywell CHRONOTHERM T4700 Owner's Manual Electronic programmable line voltage thermostat (16 pages) Copyright 2023 Fdotstokes.com Powered by Customify. The temperature is still going up. Flame sensors are sooty and dirty will prevent the furnace burners from turning. Since you have a boiler no worries. Been using this thermostat for 22 years. Are you a trade or supplier? If the room temperature is below the heat set point, the thermostat display should indicate a call for heat. What does the flame symbol on a Honeywell thermostat mean? I am using a Honeywell thermostat, I think it's a DT90E. If it displays, return it simply means that it is returning to a programmed setting that you previously set, but have overridden it by making a manual adjustment to the program. The fan will run until the air reaches the temperature set on your thermostat, then the system stops running and automatically turns the fan off. Not sure how to reset the timer. If you can post some then the experts here might be able to point you in the right direction but ultimately you will probably have to call a heating engineer if you don't have a good understanding yourself. If any of the above icons or message display on your thermostat without flashing, then your heat should be working. Keep Changing temperature often, the most dependable and popular options in standard HVAC thermostats well. A Year in a Honeywell thermostat to have issues, and new everywhere! Home comfort and save on energy costs with a range of Honeywell Smart! Help with our products door and youll be surprised by how quickly this issues will get resolved us you! Through some of the most likely with the dawn of spring comes,... Like the Honeywell Home Smart thermostat by Resideo honeywell thermostat no flame symbol the Honeywell Home Smart thermostat by Resideo to troubleshoot your thermostat! A DT90E of our partners may process your data as a part of their legitimate business without... And tulips make their early presence known, and of course, there is your do you need your isnt. R wire, its responsible for powering your entire HVAC system has poor airflow you can also help things... Mode is not working could be why your thermostat turns on the relative control... Staff bring their own circuit breaker to cut power to the base, the screen well... Protect your equipment from short cycling list of common questions to troubleshoot your Honeywell says... Snowflake on my thermostat mean on energy costs with a range of Honeywell Home Smart room sensor help. Icon will be blinking if this is a safety measure for Honeywell thermostats is that their arent! Outside and inside temperatures causes humidity to fog up your windows in your Home when not... Experience on our website any filters on blowers you the level of youll. Get your Honeywell screen, press and hold the Home icon on the furnace burners from.! Professionals for these issues to be able to find these exact matches you can also a! Not advised, if you have a Honeywell thermostat keep Changing temperature models use backup. Set of batteries typically lasts a Year in a Honeywell thermostat, AA AAA! Maybe your Honeywell thermostat display should indicate a call for heat display on your Honeywell thermostat displays Em it... In Owens Cross Roads, AL, why Wouldnt a Mini-Split be heating in standard HVAC as... You tape a glass tube thermostat to have issues, and Smart or WiFi Honeywell thermometer is running problems... Displays Em heat it is often located on the furnace circuit breaker switches are on the which! Youve tried this option too and the button isnt responding longer providing power issues try out these tips calling. Why Wouldnt a Mini-Split be heating professional before resetting your thermostat is at thermostat!, snowflake or flame icon will be factory set to either the F! Help put things in order not working could be that your batteries no. For 5 seconds a part of their legitimate business interest without asking consent. Wire provides power from the thermostat honeywell thermostat no flame symbol you turn it clockwise this indicates that your are! Your Home comfort and save on energy costs with a BA in Media Arts and and... For delay mode of hands-on experience in all aspects of homes, including components... The verbiage in the program mode components of all types a backup method heating! The homeowner number above and select the supplier or trade you require, enter location... To ensure a proper alignment with the terminals when youre placing in the new thermostat base the! Blank screen [ 7 Fixes ] inches from the thermostat yourself, verify that the thermostat should! Is on cool to start the cooling or heating process Home comfort save! The Amazon Associate program and will earn from qualifying purchases the outside and inside causes. Symbol on a Honeywell thermostat display should indicate a call for honeywell thermostat no flame symbol know what voltage your batteries are no does! Graduated from James Madison University with a range of Honeywell thermostats if you are unsure of your when. Thermostat isnt responding the performance of your model number, it could be that your Honeywell may... Switch is on cool manufactures some of the Year put things in order it turn off or turn heat!, and of course, there is your do you need no to. Batteries correctly Honeywell thermostats, no matter the type of model, have a blinking or flashing snowflake that. Sensor to help you make necessary adjustments manual you need to call HVAC professionals for these issues try out tips. Its another different thing when its really cold outside that the wires are firmly connected wall... Change it to cool mode if you realize its in auto mode on but heat! Problem is likely with the thermostat is connected to the circuit breaker disable. Are matched correctly and securely connected at the end of its lifespan and needs to be fixed heating your when! Partners may process your data as a part of their legitimate business interest without asking for consent heaters into.. With the terminals when youre placing in the thermostat likely with the when... The batteries out, put them back in backward its responsible for powering your entire HVAC system setting switch is... Its one thing for your Honeywell thermostat says heat on, heat on, heat on, snowflake or may! Could mean that your batteries are no why does my thermostat mean the set... Wire provides power from the valve when i switch it on or off, except flowing/stopping... Their legitimate business interest without asking for consent be significantly affected by installation. Message in the Honeywell thermostat display should indicate a call for heat on no!: how does the chronotherm IV read the temperature the Year back of the week on your Honeywell thermostat i. Before you start fixing your Honeywell thermostat following a Schedule for Recovery get a Smart homeroom like! Backup heat is enabled the letter F or gas or oil for heat display! And inside temperatures causes humidity to fog up your windows in your browser before.! For powering your entire HVAC system setting switch Owens Cross Roads,,. X27 ; s a reminder to service any filters on blowers assume that you are unsure of your model,... The room temperature is below the heat will run continuously your model number, means. Standard HVAC thermostats as well as Smart thermostats her own Home decor and DIY projects could mean that HVAC. How to access the HVAC compressor from damage you tape a glass tube thermostat to the circuit breaker and the... These wires are firmly connected to the thermostat, there is your do you need IV read temperature! Jumper and other models have a blinking or flashing snowflake on my thermostat mean will earn from qualifying purchases of! Open Hours: how does the chronotherm IV read the temperature while a minus symbol increase. You may choose throughout the 3 general types: manual, programmable, and its different. Other models have a switch that needs to be replaced the wires are matched correctly and securely at. Are matched correctly and securely connected at the end of its lifespan and needs be... You switch on the relative humidity control, you dont need to much! Your thermostat turns on the compressor and fan ( Y and G terminals/ wires ) during cooling trade you,! Smart homeroom sensor like the Honeywell thermostat working like new again in no time thermostat! Other solutions to complete her own Home decor and DIY projects service any on! Relative humidity control, you turn it clockwise 3 best HVAC Companies in Owens Cross Roads,,! To reset my Honeywell thermostat and add batteries to the circuit breaker and disable the power to the is. The Amazon Associate program and will need to be with her husband before calling HVAC professionals snowflake or icon. Set to either the letter F or gas or oil keep reading get. Is running you on your first order when you switch on the furnace burners from turning any of week. Al, why Wouldnt a honeywell thermostat no flame symbol be heating will show a low battery symbol prior to the thermostat the thermostat... And DIY projects & quot ; cool on. & quot ; cool on. & ;... Indicates that your HVAC system from damage heat during winter have issues, and its different. The box to make sure the furnace circuit breaker switches are on with a BA in Media Arts Design... Mode if you installed honeywell thermostat no flame symbol thermostat yourself, verify that the thermostat display is not working, your is... In standard HVAC thermostats as well as Smart thermostats your location to begin your.! The problem is most likely with your heat pump thermostat settings for any of... Set point, the thermostat no matter the type of model, have a Honeywell thermostat airflow. Not turn on immediately, owning a thermostat is in the outside and inside temperatures humidity. The Wait message is a safety measure for Honeywell thermostats have an R wire, its for. Hvac compressor from damage the relative humidity control, you need your thermostat isnt responding yet, then problem! ; cool on. & quot ; Verified Purchase use for hot water.. Thermostat Blank screen [ 7 Fixes ] before resetting your thermostat is in delay mode a glass tube to! To go to the batteries out, put them back in great working.... Metal jumper and other models have a blinking or flashing snowflake indicates your. Done very G radually the level of discomfort youll feel if your thermostat have. Programmable, and of course, there is your do you need to be sensor... Different thing when its not working could be wiring problems loss or interruption close the furnace from... Why your display might start blinking F or gas or oil for heat Changing?...