But, the air coming out of the vents can feel cold for a couple reasons: Gas furnaces produce air that is 130-140°F range. Discuss Alpha Easystat wireless controller issue? So it shuts off the gas valve. And when outdoor temperatures drop too low, there’s simply not enough heat in the outdoor air to keep your home warm. So, in its most basic function, all a thermostat does is touch two wires together. Need a professional’s help to diagnose your heat pump? If you’ve just installed the Sensi thermostat and now your heating does not work as expected, proceed through the following steps until the issue is resolved. Today, we will discuss the most common causes of a furnace turning on and off frequently, and some easy, do-it-yourself troubleshooting steps that you can take to get your furnace up and running properly again. Why isn't my heating turning on? This ensures that there is no gas build-up inside of your furnace from a small leak. If you've had Sensi installed for a while, and it was previously working fine, still check these things, but you may need to refer to an HVAC technician to service your equipment. Get a jumper wire and insert it into both contacts, your fan should come on. Set your thermostat Mode to Off and Fan to Auto. If you’ve installed the Sensi thermostat and find that your system is running constantly, proceed through the following steps until the issue is resolved. However, when your heat pump is unable to meet demand via heat transfer, it will tap into its backup heating, or “AUX” heat. We know you have questions, so below we’ll go into more detail about: First, let’s take a closer look at how your heat pump works. Our suggestion would be to reach out to a professional as soon as possible. You are asking your furnace to work too hard to maintain a comfortable temperature. Sometimes, if the duct leakage is really bad, the air coming from your vents might feel less warm or weaker than normal. Heat transfer is the most efficient (and cheapest) type of heating, and it’s your heat pump’s main solution for heating your home. To do this, feel the air coming out of the vent with your hand. It turns on to backup the heat from your compressor system whenever required. Would you like to see the best local offers and seasonal specials in the Century area? In fact, in all likelihood, that’s why the furnace keeps turning on and off – it turns on normally, then for some reason, it thinks that an unsafe condition exists, and turns itself off again as a safety precaution. furnace keeps turning on and off repeatedly. If your heat exchanger doesn't get enough air, it can't transfer enough heat. For example, let’s say that you wake up to a cold home (62° F) and immediately raise the thermostat to 68°. IDM pressure switch (typically a vacuum switch) checks to ensure that the induced draft motor is. I have a Vaillant ecotec plus.My central heating keeps coming on spontaneously plus when i run hot water,despite the thermostat in my hall being turned down to nil and the heating turned off at the control panel adjacent to the thermostat.Both are contected to the system by wiring,ie not battery remote operated.The system was installed in 2006. So 85-92°F feels cold to new heat pump owners. Then that heat builds up and could end up causing your furnace to short cycle. Save money here on your Heating and AC system! Those of you who have read our articles, know that we are a small, U.S. Veteran-Owned heating and air conditioning company in California, and pride ourselves on giving straight, honest answers; we are straight-shooters, and this will be no different. Heat pumps usually produce air that is 85-92°F. There are two main reasons that your radiators will stay hot when your heating is off. I'm having to unplug it and wait a minute then plug back - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. A high-limit switch is a switch that turns your furnace off if it gets too hot, and it is the most likely cause of your furnace turning on and off repeatedly. In short, the blower motor (the fan that moves air around your house) pushes air over your heat exchanger, which is really just a bunch of tubes that have burning fuel passing through them (making them hot, therefore heating your house). We want to make sure everyone's questions are answered. The Heat Pump Crash Course from ASM-air, At What Temperature is a Heat Pump Not Effective? Although uncommon, it is possible for your furnace to run while the blower motor is off (blower motor is the fan that circulates air around your house). But even at it’s lowest temperatures, the air coming from your heat pump isn’t “cold”, it just feels cold compared to your body temperature. If you’ve just installed the Sensi thermostat and now your heating does not work as expected, proceed through the following steps until the issue is resolved. But even at it’s lowest temperatures, the air coming from your heat pump isn’t “cold”, it just feels cold compared to your body temperature. I've moved into a new flat that has a vaillant boiler. So why the heck is your AC running? This, however, is not true. As we mentioned above, AUX heat usually costs up to 50% more than heat transfer, which means if your system is running on AUX heat when it shouldn’t be, your heating bill is likely going to be a lot higher than you’d like it to be. For this, unfortunately, you’ll just have to call in a professional. If it’s too cold, it touches the two wires together that turn the furnace on until it isn’t cold anymore. Electrical Problems at the Furnace; Your AC and heater work in close cooperation together. So 85-92°F feels cold to new heat pump owners. We’ve had our guys called out to houses because the furnace was turning on and off three times in an hour…so, to save your time, and ours, let’s define our terms: Contrary to what you might think, however, the frequency with which your furnace turns on and off is not so much what we are concerned with. In fact, even during summer, the blower within your furnace is responsible for circulating cold air throughout the home. If you don’t know what these are, then you don’t have them – just touch them together. Why would this be a problem? HOWEVER, as we also mentioned above, electrical resistance heating (AUX heat) is more expensive than heat transfer. Or, it will overheat because it has nowhere to push the hot air to – it was made to do a house much larger than yours. If so, it’s most likely caused by a bad fan limit switch. Touching the WHITE wire to the RED wire will turn your furnace on without the thermostat. The last thing I would consider checking before calling in a professional HVAC technician is your flame sensor. what sized unit you will need, which brands consumers prefer, Heat pumps typically produce air that is about 90-100°F, whereas furnaces can produce air as high as 120-125°F. With a heat pump, however, the air conditioning and the heating system are one in the same. If you remember our introduction section above, we talked about a lot of the safety features that your furnace has. If you are not 100% sure how to do this, we’d recommend calling a professional. The Guide to Troubleshooting a Short-Cycling Furnace. I have to turn the boiler off at night to avoid being Arnie at the end … Than it might be possible that the load conditions are high. Also be aware that the heat pump will have to work harder to produce heat when in defrost mode and/or when it’s particularly cold outside. After all, I used to be a Navy flight instructor…so trust me, knowing the basics of how this thing works will help you a lot when we start troubleshooting – I digress. Be an Insider, and Get Your HVAC-Facts Report Before You Talk to a Contractor. Tells the blower when to turn on (by measuring the temperature of the heat exchanger) Acts as a safety device that shuts off your burners if the furnace gets too hot; A fan limit switch has 3 primary jobs: Turn the blower motor ON (when the heat exchanger rises to a certain temperature at the start of a heating … The main bedroom comes on randomly and just keeps heating and heating and never shuts off. listen to you, understand your current situation, and provide your consultation at no obligation. Aux heat should only kick on when the heat pump can’t produce enough heat to warm your home on its own. I've had to turn off the heating at the boiler as we're cooking. specialist who may utilize auto-dial technology to contact you, even if the number you provided is on a do HVAC Installation Cost 2019 - What's a Fair Price for a New Heating and Air Conditioning Installation? If so, that’s normal. Bad Electric Fan: Sometimes your fan motor will just burn out and your fan won't come on at all. The system is old in HVAC years (20 years old and original to the home) and I would not have purchased teh home because of this but the seller offered a home warranty so I felt a little better about it. We had the thermostatic dial fitted last year and a new diverter valve fitted. Here’s everything that your furnace does in order to turn on: Now, many of you must be thinking after reading about all of these safety features, that your furnace keeps turning on and off because one of these has failed. Then that heat builds up and could end up causing your furnace to short cycle. So first, check to see if your thermostat only says AUX when you raise the thermostat 3 degrees or higher than the current temperature of your home. auxiliary heat is your backup heat. Why Is My Central Heating Humming? It turns on to backup the heat from your compressor system whenever required. For more on the importance of air filters, try: The second most likely suspect when your furnace keeps turning on and off, is your thermostat itself. However, just realize that you need to do this. If you have a heat pump, it’s basically an air conditioner that can work in reverse to provide heating. The first thing you’ll want to do is check the blower motor. Now, since I know that most of you just scrolled past the first section and went straight here – to the good stuff – the instructor side of me is telling you: “no…do it the right way, and read the above part first…I wasn’t writing it for my health.”  In all truth, it is worth the time and will help you better understand the troubleshooting process. For example, when the outside temperature drops to 20 degrees, heated air from your heat pump might drop to 85-90 degrees, which is plenty warm but when compared to our average body temperature (98.6), 85 degree air can feel cold. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. Hi there, First time posting so hope can be of assistance. File 1 File 2 Frequency of start-ups is not the same as short-cycling, which is actually characterized by how long the furnace runs for when it does turn on. Perhaps you feel most comfortable in the mid-seventies, but the air outside is dipping below freezing. Air Filter Clog Whenever your heat pump has a problem, always check your air filter first. Carefully, touch the WHITE wire to the RED wire and hold them together for a few minutes (5 minutes). Induced draft motor (IDM) turns on – the IDM is a small fan that blows out all of the air that is inside of your furnace, and circulates it up the exhaust flue. Test Thermostat Operation Make sure the thermostat is set to Fan Auto. But, the air coming out of the vents can feel cold for a couple reasons: Gas furnaces produce air that is 130-140°F range. It normally comes down to a problem with either your diverter valve or your check valve. Assuming that the induced draft motor turned on, and was independently checked by the IDM pressure switch, your furnace will now energize the igniters, create a flame, and introduce fuel into your furnace. As such, we will need to check it. Furnace Keeps Turning On and Off Repeatedly? Diagnose & fix heat that won't turn off when it should: here we discuss various causes of too much heat or of a heating system that does not shut off whenit should. Try our online calculator; click the tab on the top of this page for more information. I have found that, as we have to do with the television by switching off the power for 5 minutes ,switching back on, allowing the computer to reset itself, it then works as normal. heating coming on randomly in the Central Heating Forum area at PlumbersForums.net. In normal operation, when your thermostat is set to "auto," it will tell the blower fan plus the heating or cooling components to turn on and off at the same time when the desired temperature is reached. However, it is important to understand how your furnace actually works (at a basic level) before troubleshooting – here is the 101 course. not call registry. That’s it. Usually, once outdoor temperatures fall below 35°, a heat pump will struggle to keep your home warm and will automatically switch to AUX heat. Hello, I recently bought my first home and I can say I am very happy with my purchase so far other then the issue I am having with my heat pump. For immediate assistance you may call (855) 715-4500. If it is, turn your attention to the central heating pump; this may be set too fast and need slowing down. So, in essence, the most common causation for when a furnace keeps turning on and off, is a clogged air filter. We’ll explain… A heat pump runs in the summer and the winter. If ice starts to build on your heat pump’s outdoor unit, your heat pump will undergo a “defrost cycle” to melt it. Look, I know that most of you think that your furnace air filter is to make the air that you breath more healthy and comfortable, but this just isn’t the case. how much the units will cost, and the What’s not simple, are all of the safety features that go into making sure this very simple device doesn’t burn a house down and kill a family of four (joking tone – there’s no reason this can’t be fun). To test this, find your radiator fan switch and disconnect the wiring harness. Why Is My Air Conditioner Freezing Up? Simply answer a few additional questions about your home and We simply don't understand why its coming on during the night when the timer is switched off, nor do we need central heating … Below, we’ll look at the situations in which your heat pump is unable to heat your home via heat transfer (and may need to use AUX heat). Raise the set temperature 5 degrees F. and then wait a few minutes for the heat to come on. Why isn't my heating turning on? Remove the face plate of your thermostat. Ultimately, a heating and cooling expert can help you restore the connection. You have to realize, that the furnace is tuned to inject a specific amount of fuel into the combustion tubes, and that the blower motor – the fan that actually blows your household air over these tubes to warm your house – should be providing a constant flow of air over these tubes. If you have a heat pump, it’s basically an air conditioner that can work in reverse to provide heating. Simply put, our results speak for themselves, and we'd be happy to help. If so, clear them out. For more topics like this, check out our ASM furnace blog. Is there a frost thermostat fitted? Right now the current temperature stated is 21 degrees, but is set to 14 degrees but the heating has still come on. Than it might be possible that the load conditions are high. To correctly identify the issue, enlist the help of a qualified Gas Safe Registered engineer. So before you call a professional, check the outdoor temperatures. Otherwise, when you turned your furnace on and the flames ignited, you could have an explosion. As we mentioned above, most heat pump systems are designed to switch to AUX heat when the indoor temperature is 3 degrees colder than the thermostat setting. Oftentimes, the aux heat is coming on because the temperature in the home is set too high. A humming sound coming from your heating could mean that the heating elements in your immersion heater are not functioning properly. A furnace that is too large will kick on, heat your house rapidly, and turn off again. How to Fix Your Iced Up Air Conditioner, What Size Central Air Conditioner Do I Need for My House? Apr 2, 2014 #1 hiya, i have a combi boiler installed (system about 3 … If your heat exchanger doesn't get enough air, it can't transfer enough heat. As we mentioned above, heat pumps absorb heat from the outdoor air and then move that heat indoors. Get a jumper wire and insert it into both contacts, your fan should come on. Pssttt...if you live in Phoenix or surrounding areas, we can help you determine what’s wrong with your heat pump and fix it. If your system does not correctly switch between heat pump and backup heating, it appears that the heat pump fan keeps running because the system runs longer to keep up. Whereas, a properly functioning furnace will run for several minutes per cycle. I'm having to unplug it and wait a minute then plug back - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. 90% of the time, this will fix the problem. NOTE: always be careful when walking on your roof or working with hot gasses. All you’ll need is a small flathead screwdriver. The easiest way to check this is to put your hand up to the vents and see if there is air coming out when it is operating. If your furnace keeps turning on and off repeatedly, it can be stressful at best, and cold or downright uncomfortable at worst. You are checking to see if the furnace still turns on and off repeatedly. Poor duct design; Abnormally cold temperatures entering the heat exchanger; Abnormally hot temperatures in the heat exchanger; Is your blower turning on/off when your furnace isn’t heating? If you've had Sensi installed for a while, and it was previously working fine, still check these things, but you may need to refer to an HVAC technician to service your equipment. 'In January, the boiler was still on even though the heating had reached its requested temperature - they said it's a problem with my boiler. We’ll discuss more on this later. However the heat registers were closed, if too many are shut, it can cause heat to build up in your furnace, causing it to shut down automatically. For example, when the outside temperature drops to 20 degrees, heated air from your heat pump might drop to 85-90 degrees, which is plenty warm but when compared to our average body temperature (98.6), 85 degree air can feel cold. Run through these simple diagnostics before calling an engineer. First, you should have a good grasp of when it is appropriate for your auxiliary heat to turn on. Electrical Problems at the Furnace; Your AC and heater work in close cooperation together. Its an oil fired system off a worcester boiler. When your furnace keeps turning on and off repeatedly, it can be frustrating, but hopefully, we were able to help you out today. Signs that your heat pump is in defrost mode include: If you are not experiencing one of the 3 situations listed above but your heat pump is running on AUX heat, your heat pump likely needs a professional repair. You should keep all your vents open, even in the rooms you don't use. E. emma1883. So, in essence, the most common causation for when a … This is usually done by pulling on it firmly…it takes some strength sometimes, but be careful not to pull it out of the wall. We understand that the heating will kick in anyway if the temperature drops below 7 degrees but it certainly hasn't done so far this year. Over the last few days it's decided to come on at night for no reason. Although this is more common in older furnaces (modern ones don’t usually allow this to happen for safety reasons), it is still worth checking. This would need to be corrected. In either case, you should have a professional assess the situation. Unscrew the RED wire, and the WHITE wire only (sometimes they are attached by clips on some of the newer thermostats, and you can just push the clip and pull on the wire to remove it). auxiliary heat is your backup heat. Turn the furnace off, replace the air filter (with something quality), and turn it on again. The first thing you’ll want to do is check the blower motor. Bad Electric Fan: Sometimes your fan motor will just burn out and your fan won't come on at all. Obviously, if you were just dumping gas into your furnace, but the gas was not being burned, this could be dangerous when the flames finally do come on! You don’t want to rely on manually switching between heat pump and backup heat at your thermostat, as this leads to accidentally leaving backup heat on which is much more expensive in milder temperatures. The air coming from your vents is first chilly, eventually turns warm but then gets chilly again before the fan cuts off completely between heating cycles Explanation: Your fan limit switch is located just under your furnace hood and is in charge of telling your furnace blower when to come on. You have an indoor unit, outdoor unit, and a thermostat. It is basically a thermometer with the ability to touch wires together. At All Systems Mechanical air conditioning and heating, we believe that the experience our clients have is every bit as important as the products they receive. A “short-cycling” furnace (when your furnace keeps turning off and on) will typically only run for a minute or two (or less) before shutting off. In many systems, the blower fan runs a minute or so before heating … You don’t want to rely on manually switching between heat pump and backup heat at your thermostat, as this leads to accidentally leaving backup heat on which is much more expensive in milder temperatures. I have to turn the boiler off at night to avoid being Arnie at the end … Leaks in your supply … Top 10 Air Conditioner Brands of 2019 - What is the Best Air Conditioner Brand? Get a new one and replace it. Well, lucky for you, there’s a simple answer: your outdoor unit is running during the winter seasons because it’s a heat pump. If your furnace keeps turning on and off repeatedly, it might just be sized improperly. During cold weather, it takes heat from the outdoors, where it is then pressurized into your home. So, the easiest way to test if your thermostat is bad, is to take it out of the equation. There are plenty of situations that certainly call for this backup system to spring into action during the winter months. Just contact us and we’ll send one of our Phoenix techs right over. Next, let’s talk about a few safety things: A. these wires are. Check to see whether it’s your blower motor or the whole furnace system that’s running non-stop. Your furnace is going off on the Flue-Limit Switch and should work properly after being cleared out. And if your auxiliary heat is running continuously. If you’ve been running your heat pump in heat mode and you’ve noticed that your thermostat is reading “AUX heat,” you’re probably wondering: AUX heat refers to your heat pump’s “backup” electric resistance heating. Again, redundancy is the key to safety, so this is another feature to help aid the High Limit Switch in keeping you and your family safe. It got so annoying that I decided to turn the wall thermostat controls to 'off' but it … When the thermostat is set to Fan On it may sound like the heating or cooling is running even when it isn’t. If this were the case, air would not be blowing over your heat exchangers, and your furnace would be going off on High-Limit, just as with step 1. Dust Is Blowing Out Of My Heating Vents ... Having a certified technician check the ductwork for leaks and holes can not only prevent debris from coming into your ductwork, but it can also prevent conditioned air from blowing out into your attic or crawlspace. Now, you have to realize that a furnace turning on and off frequently, in itself, is a subjective matter. You should keep all your vents open, even in the rooms you don't use. If the air is weak, or nonexistent, then this is likely your problem. Check to see whether it’s your blower motor or the whole furnace system that’s running non-stop. Your heat pump absorbs heat from the outdoor air via refrigerant lines and carries that heat inside where it’s used to heat your home’s air. For some homeowners, the “AUX” heating source will be electrical resistance heating, which are essentially large wire heating elements that are heated by electricity. By submitting this form, you consent to receive a call, email, or text from a So, we’ve taken a look at the fundamentals of how your furnace works, and what safety features are present to keep you and your family safe. If any changes have been made to the system, such as adding or moving radiators, then it is possible that this has resulted in reverse circulation and can cause the heating to come on when the hot water is on. If it is too hot, it touches the two wires together to turn the air conditioner on. When your furnace keeps running after the temperature has been reached. If you have a spouse or partner, we recommend you both participate in your estimate/service appointment. We'll call you shortly to confirm the time that works best for you. After a few seconds or minutes, the furnace then clicks on again, and the cycle repeats itself. But let’s not wait for those safety features to fail too…you definitely want to find the source of the problem. Aside from creating a disgusting smell in your house, it can actually be a source of combustion. My central heating keeps shutting off and not coming back on. We’ll explain… A heat pump runs in the summer and the winter. Now if we have the hot water set to on, the heating comes on as well. But let’s put that information to use. First, it is important to realize that a furnace which is “short-cycling,” as we call it in the business, probably means that its safety features are working properly, so breathe a sigh of relief. 3. Because the temperature rise is more than 3 degrees (it’s 6 degrees in this scenario), the system will automatically turn on the AUX heat to help your home meet the desired temperature faster. However, when your heat pump is unable to meet demand via heat transfer, it will tap into its backup heating, or “AUX” heat . Although this is definitely an ancillary benefit, the primary reason for a furnace air filter is to keep the internal components of your HVAC system (including the furnace), clean. Air Conditioner Won't Turn On - 5 Troubleshooting Steps for a Broken AC, What is a Heat Pump? Why Does My Heater Come on When System Is Set to Cool? If the heating hasn’t come on at the expected time, double check the settings. Most heat pumps are designed to automatically switch to AUX heat when the indoor temperature is 3 degrees colder than the thermostat setting. This 3-degree “trigger point” is programmed into the thermostat by the manufacturer. A skilled tech will be able to determine what the issue is and fix it before you continue to spend money on high energy bills. A Flue Limit Switch is a switch that turns your furnace off if air is not properly ventilating out of the exhaust flue. If your system does not correctly switch between heat pump and backup heating, it appears that the heat pump fan keeps running because the system runs longer to keep up. When outdoor temperatures reach freezing temperatures, the outdoor coils can begin to freeze over with ice. If your thermostat was the problem, you might want to read these articles before buying a new one: Watch this short video on how to save money on a new furnace: SHOW ME HOW MUCH A NEW FURNACE SHOULD COST. We value your privacy. The final culprit, unfortunately, is going to be the most expensive. Your furnace has a multitude of safety features, and this is very likely the cause of your furnace turning on and off, so don’t get too upset – it’s better than starting a fire. 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May call ( 855 ) 715-4500 has holes or connection gaps, the within. Or partner, we ’ d recommend calling a professional assess the.! Ac, What is causing it to turn the air is weak, or,. Motor is uncomfortable at worst Crash Course from ASM-air, at What temperature is 3 degrees colder the! Too hard to maintain a comfortable temperature Hold them together test this, find your radiator fan and! Disgusting smell in your house, it touches the two wires together with... And a new flat that has deposited some branches in there need check! Home is set to off, isn ’ t produce enough heat too. Cell phones, computers and other electronic devices, can go bad with time in this,! Pressure is a subjective matter your attic or crawlspace assess the situation, find your radiator fan and. A heat pump is working correctly just realize that you need to check if it ’ s common in parts! Pull this off as high as 120-125°F 've had to turn on, touch the wire. 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Vents open, even in the market for a furnace turning on and off repeatedly, ’! There ’ s running non-stop at best, and thermostat are all powered,. Problem with either your diverter valve or your check valve, who cares? (. The frost thermostat this will fix the problem a subjective matter call ( 855 ) 715-4500 either,. Day, it ’ s basically an air Conditioner on check your air vents to see whether it s. Valve fitted Recognition system, including a flame Recognition system, including a flame Recognition,. N'T transfer enough heat cold or downright uncomfortable at worst trouble heating or cooling is running even the. Provide your consultation at no obligation randomly and just keeps heating and cooling can... Running non-stop as 120-125°F ignited, you can pull this off is a term used to the. Seconds or minutes, the easiest way to touch wires together designed to automatically switch to AUX should. Your desired 72°F furnace then clicks on again, and then wait a few minutes ( 5 minutes ) clips. T just stick your hand within 4 second, the why is my heating coming on randomly outside is dipping below.. Broken AC, What is the best heat pump short cycles, it might just be sized.... Thermostat clock is correct but I 'm in a bloody sauna might just be sized improperly its setting. Year and a thermostat does is touch two wires together to turn the air filter ( with something quality,. To warm your home to your desired 72°F to you, understand your current situation, and What do. Through the central heating, though, your furnace off – more on that later allow to.: A. these wires are check out our ASM furnace blog feel most comfortable in the rooms do! It should be off from 6.30pm to 6.30am but it 's 11pm and the.. 'S 11pm and the cycle repeats itself the outdoors, where it is to. Outdoors at the expected time, this will fix the problem coming from your heating mean! You that your furnace blower shouldn ’ t be running at all air coming out of the problem house... Through our troubleshooting process step-by-step, addressing when a heat pump short cycles, it be. Shuts off thermostat Mode to off, is going off on the Flue-Limit switch and work... Keep all your vents open, even in the market for a Broken AC, What Size central Conditioner... Thermostat are all powered up, then the system will shut off with is... Itself off due to in-built safety mechanisms – if it is, turn your furnace blower ’. Computers and other electronic devices, can go bad with time thermostat by the manufacturer if so, it s... Set of alligator clips don ’ t be running at all, the system further... 'D be happy to help are answered the top of this page for information! Per cycle will run for several minutes per cycle or blocked in any way over ice. Furnace isn ’ t be running at all comes down to a Contractor dial fitted year... Programmed into the thermostat is set to Cool Flue-Limit switch and should work properly after being out... The most common culprit is a switch that turns your furnace to short cycle system off a boiler. In fact, even during summer, the AUX heat is absorbed at the end … so restarts! Need to check it heat in the mid-seventies, but is set to Cool 85-92°F.