Furnace Keeps Running After Temp Reached

The colour of the grate indicates the temperature of the furnace. After first use — The crucible should be heated on full power to the desired temperature, however the slow heating phase to 200°C (390°F). A dirty blower wheel could also be the problem. When you turn up the heat after the house has cooled down the furnace will have to run for a long period to get the house back up to temperature. When it shuts off due to high temperature, you should check filter condition first. When the gas valve shuts off; after about 5 minutes the piezo relights and gas valve opens and furnace runs about 5 minutes and turns off again before reaching setpoint. Is there a fix for this (Honeywell thermostat) Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?. If you have it set to "ON" - it'll run 24/7 irrespective of temperature. Open the H 2 and CH 4 valves located on the top of the cylinders. If the fan stays on after this period, then it starts pushing cold air into the house, which could account for the uneven. My blower fan keeps running after the temperature is reached in the room. Automatically the overhead fan comes on ( air only, no cooling) as well as the Furnace. Two things can cause a blower to run continuously: the room thermostat or the limit. Here's what happened after the inside temp became stable at 71 Deg. Most units run for a set amount of time after reaching desired temp. The problem becomes "do you replace your furnace or pay $400. The furnace itself is located underground, with the entrance near the south-east corner of the city, denoted by both an Activity and furnace symbol on the minimap. Check the condenser. Know the Age of Your Furnace. At -20 then yeah, maybe 500. Check and change your air filter during this time. Ensure adequate light oil / atomising air pressure Check boiler expansion is free Control firing rate in such away that steaming starts only after 45 minutes Keep economiser re circulation valve open When drum pressure reaches 2 kg/cm2close drum vents Control firing rate according to start up curve and FOT not exceeding 5400c Start closing S. The magic is that water at this temp carries a lot of heat energy. If a big discrepancy, $250 seems like a steep price. IE all furnaces start the fan after the plenum have reached a preset temperature. As soon as the desired temperature is reached, the thermostat shuts off the burner to conserve energy. I can hear the thermostat kick off when desired temp is reached but it still keeps running!. It’s a never-ending cycle of the furnace turning on and off to keep the home at your desired temperature. Were you on shore power, or depending upon the batteries? Most furnaces are not reliable once the battery voltage drops to 10. If your RV furnace isn’t working right, there are things to check, and you’ll learn about them here. 5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. However, behind the scene the thermostat knows the temp has dropped and it started the furnace. If I go into the app and adjust the temperature +1 then - 1, it will turn the furnace back on again for 15-20 min before shutting off again. Noticed in this winter, the furnace would come on every 5-6 minutes, run for 5 minutes and then off. Suitable With a wide range, can be used for drying various materials, it is common drying equipment. Before you assume you have a furnace problem, do some furnace troubleshooting and check the thermostat to make sure it's actually. A limit switch is a device that’s located under your furnace’s supply plenum. While this control was effective, it resulted in defrost when there was no frost on the coil. Simply backing the screw out, re-tightening, and pressing the RUN PROGRAM key should put your thermostat back into the Fahrenheit mode. In addition, when you turn the thermostat down and the inside temperature begins to drop, the furnace won’t operate at all until it reaches 55 degrees. 2) Furnace overheated Let's say your furnace blows hot air, then cold air, but then stops blowing any air at all after a while. So if you maintain 70 degrees in the home, a heat pump will put out about 90 degree air depending on the outside temperature. 5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. Hello all, I have a problem with my gas furnace. The thermostat temp display will continue to increase after the furnace turns off and eventually after 30 or more minutes will show the correct temp, but by then the house is 3 degrees hotter than it should be. The actually reached temperature varies from sintering furnace to sintering furnace. Simply set the desired temperature and the inverter compressor will speed up and slow down to maintain temperature. Hazard is mitigated by following test procedure, staying behind the protective barricades, and allowing the furnace to cool before handling. We Sell Heating, Air Conditioning Parts & Supplies To You At Low Prices! 111 thoughts on " Gas & Electric Furnace Troubleshooting Simplified Problem is the fan keeps going even after desired temp is reached. They are all very concerned with the cost of energy used in their operations. When you turn up the heat after the house has cooled down the furnace will have to run for a long period to get the house back up to temperature. Be sure not to over fill a furnace with no slag hole or iron and slag will pour into the wind box. ! c queue max run limit reached Fri Sep 20 13:15:00 2013! rescheduling a cron job Fri Sep 20 13:15:00 2013 The reason the jobs are not running is because there are too many simultaneous jobs at the time the daemon tries to run a new job. After adjusting the setting, the furnace will continue to immediately come back on over and over. Fossil fuel forced air heating systems will typically have short run times — a lot of high temperature air for a few minutes followed by a cooling off period, then another blast of hot air and on and on. One sign that your furnace may need some attention is that your furnace fails to turn off and continues to run, even when the temperature reaches the set temp on the thermostat. but when I did the furnace stays on after the click when it reaches temp. I noticed that the furnace at my parent's house is shorty cycling, specifically the burner kicks on, fires for 2 minutes, shuts off for 1 minute, then that cycle repeats continuously until the set temperature is reached and the thermostat turns it off. They stay on until it makes my thermostat setting, say 74. Change your filter. This payoff can take a long time and may not be the best choice for all home owners. After that, the furnace should be able to operate normally. Part 3 - Duration: HVAC Service- Furnace Won't Stop Running - Duration: 7:02. Check Your Thermostat. Soon after, it turns back on and the process repeats. 5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. The control of electri. When the house reaches the desired temperature, the furnace is absolutely fine. KF25 gas outlet and digital vacuum gauge on the right flange and barb gas inlet on the left, allows the furnace to heat sample in vacuum or flowing gas. What you should do next is go and watch your furnace (take the front. The control computer will display the status of the furnace and indicate whether the furnace is in use, or whether it is free for you to use. Re: Furnace Problem?? Originally Posted by navyAZ1 Your burner should ignite and burn until the desired temp is reached in the coach then it goes out and then the blower continues to blow for about 2 minutes, then everything shuts down until the thermostat sends a demand for heat once again. This cycle repeats itself in order to prevent the furnace temperature from going too far above or. Check the condenser. A dirty blower wheel could also be the problem. Get shopping advice from experts, friends and the community! This is a resubmit question for a sears upflow wall furnace Model #867. This usually happens when the temperature is at. Then the fan should shut off. If, for some reason, the temperature probe did not bring the unit out of defrost, a timer would bring the unit out of defrost after 10 to 12 minutes. This switch may power the low-voltage thermostat as well as the furnace. I finial decided to turn it off from the thermostat and still the furnace stayed on. Measurements were taken during the growing season in 2016 in the Upper Biebrza Basin in north-east Poland. Is the furnace working? Does it come on, blow hot air, and cut off when temp is reached (if temp is reached)? I'm trying to figure out from your story, if it will not function, or if it functions but the trailer just will not get warm. Don't go calling your furnace repairman just yet, though. In this mode, the unit will run on HEAT or COOL depending on the room and set temperatures. Then try raising the set temperature 5 degrees and waiting a few minutes. and set the furnace for the desired temperature. When this happens, the burners are shut off, but the fan will (or should) keep running until it reaches the Fan-Off setting. It would then turn off once the temperature was reached, repeating that cycle again and again. Instead, gradually increase the temperature until it reaches the appropriate level of heat (usually 500 °F (260 °C)). Check the filter and replace it if it’s covered in debris. We have the original thermostat also which blinks a code and according to the manuals we got withthe system, there must be either a timer or temperature shutoff on the compressor to protect it. The thermostat is a basic Honeywell digitial. Soon after, it turns back on and the process repeats. Furnace not always starting. Once the thermostat is satisfied, the gas shuts off but the fan will continue to run until the furnace's temperature is cooled to a certain temperature. The furnace is operating at 20 degrees F temperature rise with the proper gas pressure at the manifold. I have been looking around online and a relay could be poss. 9 Furnace Troubleshooting Tips from the Pros The next time your gas furnace stops pumping out the heat, before you call in the pros, try to troubleshoot the problem yourself using this handy. When the furnace's thermostat is set to auto, the fan will only run until the space that is being heated or cooled reaches the preset temperature. It would probably keep running but I turn the thermostat to off, which kind of defeats the purpose of installing a programmable thermostat. On some inspections, the furnace does this: the burners come on, then the blower, but after a few minutes the burners go off and the blower stays running. Turn the power back on and check the furnace for proper operation. If it's set to ON, the furnace fan keeps running until the setting is changed. Think about that for a second, no matter how good you take care of it, it’s still going to age after working for so many hours for years. Blower on my furnace keeps turning off after about 5 mins before reaching temp. Then check your oil supply and filter. Your furnace will run until it satisfies that preset temperature. Each room typically has two vents—one for the hot air and one to carry the colder air back to the furnace, where the cycle repeats. We want our furnace to keep running and providing us with good glass. by Premier Heating & Cooling | Nov 2 When your system reaches the temperature you've set for it, the fan will shut off until the next cycle. When it shuts off due to high temperature, you should check filter condition first. A set temperature above 80 degrees strains almost any furnace, especially in a big house or in cold weather. The fan is not shutting off when the temp of the house is above what the thermostat is set for. The furnace works well but after the thermostat reaches the set temperature and the "heat on" indicator clicks off the fan continues running for about two minutes. Single Stage furnaces will kick on, run full blast untile the temp reaches the set point, then kick off. A modulating furnace, on the other hand, consistently keeps the. Recommended Action Try turning off your thermostat controls for 1 to 3 hours to see if the system resets itself. It may be that your home has reached the correct temperature, but the thermostat is not registering the conditions in the home. Get shopping advice from experts, friends and the community! This is a resubmit question for a sears upflow wall furnace Model #867. After time, the monthly savings will add up and make the more efficient furnace a cheaper long term solution. Extreme Temperature Swings. The Room temperature is the temperature inside the furnace, not of the element, the latter always be higher. Immediately after shut-down of the furnace you should see the CO levels drop. you'll get cold air because the fan continues to run as a safety measure, even after the furnace. We’ll also talk about the minimum amount of battery power needed to keep your RV furnace running. I have thermoter beside thermoset to show temp. Don’t go calling your furnace repairman just yet, though. Make sure it wasn't accidentally switched off. Well it really depends on what time of fuel source you have and what type of thermostat you have. Start studying unit 48, unit 49, unit 50, unit 51, unit 52. what might be happening is your furnace runs and then shut off when it reaches the desired temp. It limits the maximum amount of Lbs of pellets an hour you burn. Re: Furnace Problem?? Originally Posted by navyAZ1 Your burner should ignite and burn until the desired temp is reached in the coach then it goes out and then the blower continues to blow for about 2 minutes, then everything shuts down until the thermostat sends a demand for heat once again. s? System keeps running after it reaches its' set point but it is blowing cold air? Have had 3 tries to solve this problem including a new thermostat and though it achieves set point the system still does not shut itself off. My Furnace Keeps Running and Now I'm Sweating! Check your furnace's blower motor. Last night my furnace would not stop running even after the desired temperature had been reached. My house is 1500 sqft (main level) with about 1000 sqft basement (partially finished, heated). Part 3 - Duration: HVAC Service- Furnace Won't Stop Running - Duration: 7:02. With a programmable thermostat, you can automate your thermostat setting for optimal comfort and efficiency. Check the wiring to your furnace's thermostat. I finally had to trip the breaker to turn it off. Soot is an indication that combustion is not occurring cleanly. When it os on the sleep and leave settings it cycles on and off at 15 minute intervals. Then, turn the thermostat to a temperature that's lower than the current room temperature and wait 3 to 4 minutes. I reinstalled the old one, and it does the same thing. Before you assume you have a furnace problem, do some furnace troubleshooting and check the thermostat to make sure it's actually. Run thermostat wires to relay on furnace and connect wires to terminals marked T. "On" tells your furnace to run constantly. As the firebox gets to temp, the fan starts up so as to only blow hot air. Part 3 - Duration: HVAC Service- Furnace Won't Stop Running - Duration: 7:02. That is a lineal process (in reverse). Stage 1 will run longer, but uses less power, and keeps the temperature more constant. In normal operation, your furnace blower fan should come on 1. To do this, feel the air coming from the vents; if it’s warm, the furnace and blower are both running. Recommended Action Try turning off your thermostat controls for 1 to 3 hours to see if the system resets itself. On newer furnaces, if the flame is not sensed, the furnace will think the flame is not on and shut off the burners. I have been looking around online and a relay could be poss. The plenum fan kicks in and distributes the warm air throughout the home. The plenum fan serves two purposes. This gama furnace runs good once it come on spark module replaced flame sensor replace gas valve its getting fire an gas but most of time it won’t light sometime it will on it on cold nights I stick grill sticker it light every time. The second purpose of the plenum fan is to keep the wood. Oil-Furnace Repair and Troubleshooting When your oil furnaces quits, try some home diagnoses before calling in a professional, including these five tips and symptoms. I reinstalled the old one, and it does the same thing. A furnace goes through many different tasks before it will actually supply heat however most tasks won’t begin until a goal has been met. When the stove temperature is hot, it's time to pump air into the furnace. On newer furnaces, if the flame is not sensed, the furnace will think the flame is not on and shut off the burners. Another video further down the page under the discussion of "If your furnace keeps shutting off after about 5 minutes" shows the same project with a different brand of furnace. My furnace is running: sometimes the air is warm and other times its not! Sometimes the furnace ignites and then […]. This isn't Facebook or Twitter, and never will be, if you need trivialities you're in the wrong place. The furnace will stop heating. This is pain , especially at night , because I can't rest knowing this thing is running nonstop. Furnace runs till it reaches temp and shuts off, overhead fan keeps running. That is about one third of the sun’s surface temperature, and this mini furnace reaches its maximum temperature in only 2 minutes. This means that the furnace thinks it has reached the desired temperature before it has, and therefore the furnace is turning off after running for a short time. Similarly, if your thermostat was installed too close to a heat source—like a heat register or direct sunlight—it might tell your furnace to stop running because it thinks the whole house has already reached its set temperature. When heat builds up to excessive amounts inside the furnace the limit temp will be achieved and will break the heating cycle. the slag hole the well is full and the furnace is taped. The thermostat is the device that controls the temperature that the furnace is set at and plays a large part in when the unit comes on and turns off. • If temperature setting is lower than room temperature and SYSTEM ON arrow is displayed, thermostat is operating correctly. As the fine ore injec-tion amount increased, the productivity increased from 2. Get US Stove 1602R Installation Guide. If so, the limit switch, a furnace safety device, turned the furnace burners off. A limit switch is a device that’s located under your furnace’s supply plenum. In addition, when you turn the thermostat down and the inside temperature begins to drop, the furnace won’t operate at all until it reaches 55 degrees. The plenum fan kicks in and distributes the warm air throughout the home. I finial decided to turn it off from the thermostat and still the furnace stayed on. To help keep your furnace from constantly turning on and off, make sure that you change the air filter at the start of each new season and check it monthly. If this continues to happen over time, the high limit control. Test it by setting the temperature five degrees higher than the. Automatically the overhead fan comes on ( air only, no cooling) as well as the Furnace. For the first run keep the furnace on for about 20 minutes and then turn it off. Trying to fix electrical problems on your own could cause more damage or even create a fire hazard. Check and change your air filter during this time. Once interior heat reaches the chosen temperature, the furnace system will go into a "sleep" mode. Why does my 'more effiecient' heat pump furnace keep running after it reaches the temperture set point? i. if gas forced air it is mostlikely triping off on a highlimit temp sensor ,try finding intake airfilters and replace to insure good airflow,also the antisipator setting on the digital t stat might need to be changed for a highgher run time,also a heat vent might be too close to the t stat heating it up before the house, so close that one down, good luck. Furnace runs till it reaches temp and shuts off, overhead fan keeps running. Furnace Won't Shut Off? Here's Why. The furnace is a Concord 90% Efficient, gas fired, forced hot air unit with a White-Rodgers mercury switch thermostat, 5 years old. Change your filter. My furnace keeps running after the set temperature is reached. Is the furnace working? Does it come on, blow hot air, and cut off when temp is reached (if temp is reached)? I'm trying to figure out from your story, if it will not function, or if it functions but the trailer just will not get warm. We turn it on, set it to 68 degrees, and wait. The blower keeps running as the burner. It will try for two more times before it quits trying. We discuss this switch right here. Most times this is because the heater still "thinks" it has not reached the correct temperature and does not shut itself off. There are 3 common reasons why a furnace keeps turning on and off: 1) Dirty air filter. When set temp is reached the burner shuts off, pilot stays lit untill temp falls and furnace trys to fire up but pilot blows goes out. At -20 then yeah, maybe 500. set on themastat? let the furnace run and see if the blower comes back on, It will turn off the burner if it gets too hot. Blower on my furnace keeps turning off after about 5 mins before reaching temp. I've been noticing that since I've had my heat on these past few cold days, my furnace kicks off before it has even reached the set temp on the thermostat, and a min or two later, turns back on, and keeps doing it. And, the greater the rate of heat loss, the more the furnace has to work to keep the house warm. Your furnace turns on, runs for a few minutes and then shuts off. Your thermostat senses the temperature drop below your requested threshold. Furnace Won't Shut Off. Let it run for 60 to 90 minutes. Be sure that wrong times. I finial decided to turn it off from the thermostat and still the furnace stayed on. The aquastat keeps the boiler up to temperature. It is perfectly normal for the burner to continue to cycle on and off while the furnace is running. I've checked to make sure the thermostat is on AUTO but it won't turn off unless I lower the temperature manually. Understanding Furnace Blower. This is done to allow any remaining moisture to escape the refractory without causing excessive pressure inside the refractory. Shut down the furnace, check the belt, and put just a few drops of electric-motor oil in any oiling ports on your firing assembly fan (some sealed units run oil free, so you may not have ports). Like we stated above dirty filters are one of the biggest causes for this problem. In addition, when you turn the thermostat down and the inside temperature begins to drop, the furnace won’t operate at all until it reaches 55 degrees. Don't wait to have your heater inspected by a professional. The furnace will run for eight to ten minutes, and then the RV will be at a comfortable temperature for moving around and starting your morning. What should happen after that is that when the RV reaches the temperature you’ve set on the thermostat the burner should shut off and the fan should keep running another minute or two until the furnace has had a chance to cool down somewhat. It turns on fine when the thermostat tells it to, blows fine and the heat stops once the set temp is reached but the fan keeps running. I simply backed the tow vehicle up to the hitch, connected the umbilical and left the TV idling. All is good, as soon as the temp I've set is reached the furnace (when working correctly) turns the gas off and shortly after that the main fan powers down. A dirty blower wheel could also be the problem. If your furnace isn't staying on, your thermostat may not be calibrated correctly. The cron daemon has a limit of how many jobs it will run simultaneously. approved fireproof protector under furnace. The furnace keeps cycling and the temperature goes into the mid-70s. This is a goodman heatpump/furnace. The furnace keeps cycling and the temperature goes into the mid-70s. After you've completed step #9 below, you will come back to verify all these measurements again. Temperature consistency - Single- and two-stage furnaces turn on only after the interior temperature has dropped three or four degrees, then they run until the temperature reaches a degree or two above the temperature set on the thermostat, leading to wide temperature swings. Clean the surface and the cavity dust, keep the body clean and health. They control how long the blower runs after reaching the desired temp. Is the furnace working? Does it come on, blow hot air, and cut off when temp is reached (if temp is reached)? I'm trying to figure out from your story, if it will not function, or if it functions but the trailer just will not get warm. Post to Facebook. Well, there’s a world of difference. Furnace runs till it reaches temp and shuts off, overhead fan keeps running. If so I have been told that there is a kit that will replace all the gas valve and other components. I am having this same issue. The blower keeps blowing to cool the furnace down to a safe level. put the temp at 68 at Tstat, gas heat comes on room temp passes 68 but the unit never shuts off. Those problems are explained at THERMOSTAT WON'T TURN OFF. What sometimes happens if there is a large difference is that the heater appears to keep running after your desired room temperature is achieved. While this control was effective, it resulted in defrost when there was no frost on the coil. 5F), then it would cycle back on in a few minutes. I've checked to make sure the thermostat is on AUTO but it won't turn off unless I lower the temperature manually. Thermostat dropped to 70 Deg. For a safe and fast repair, contact Petro Home Services. Allow 5-10 minutes after changing setting before air conditioner starts. Understanding how a furnace works will help you to determine what the cause of the problem might be. Settings such as low, medium or high cause the fan to run continuously regardless of the temperature that is reached in the space. Just as the heat in your home turns on when a certain temperature is reached, it also turns off after the rooms are warm enough, thanks to your thermostat. within seconds (~15 - 30 seconds) 5. Instead, it continues to run until the temp reaches 68. 5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. The whole process will last about 8 hours. Temperature controlled, easy installation and maintenance. Note: If your thermostat fan is set to ON, your furnace isn’t actually running non-stop—just the blower fan is. When the furnace is RUNNING AWAY WITH ITSELF (e. On newer furnaces, if the flame is not sensed, the furnace will think the flame is not on and shut off the burners. I have thermoter beside thermoset to show temp. The heat anticiptor shuts the furnace down before your house reaches the set temp. Recommended Action Try turning off your thermostat controls for 1 to 3 hours to see if the system resets itself. Heat pump never quite reaches temperature: the back-up heat cycles off and the heat pump continues running; trying to reach temperature, but cannot. Gas furnace runs every 5-6 minutes for 5 minutes after it reaches the Hold TemperatureIs this normal New home buyer have a Honeywell Chonotherm III programmable Thermostat with a 18 years old York Furnace up in the attic. When I reconnect the thermostat the blower does not come on. What this means is that your furnace can run at a lower speed to help maintain your temperature and warm up the furnace unit but also has the ability to go full blast if the temperature really drops. At -20 then yeah, maybe 500. Possible cause The indoor unit is running, but the outdoor unit is not. When you turned the thermostat, the furnace would come online and run at its full power to heat your home to the desired temperature. Re: Furnace Problem?? Originally Posted by navyAZ1 Your burner should ignite and burn until the desired temp is reached in the coach then it goes out and then the blower continues to blow for about 2 minutes, then everything shuts down until the thermostat sends a demand for heat once again. If you look above at the program we use, Step 3 is to return to 2050°F. Indoor Fan Keeps Running How the high temp limits in electric furnaces work. Blower on my furnace keeps turning off after about 5 mins before reaching temp. It is normal for a furnace to cycle on and off anywhere from three to 10 times in an hour. HVAC fan always running at level 6 even if target temperature is reached. If you continue to have problems after trying these steps above its time to call a heating professional for help with heating repairs. Once the desired temperature level has been reached, the gas supply is closed and the blower motor shuts off. If so I have been told that there is a kit that will replace all the gas valve and other components. (11) The usual procedure is to load the furnace and then begin the soaking period when the loaded furnace reaches the desired temperature. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Ok, gas valve IS ok. I reinstalled the old one, and it does the same thing. To maximize the life of your furnace and avoid prematurely replacing parts, an annual inspection is necessary, especially once your system reaches 10 years old. At the furnace or air conditioner air handler or blower unit: the fan limit switch may include a switch that manually keeps the fan running. Why Is My Furnace Blowing Cold Air? this switch should allow the furnace burners to warm up completely before turning the fan on and should keep the fan running just until the burners cool off slightly (to prevent damage or overheating). The ignition system is given approximately one minute to energize. Then, turn the thermostat to a temperature that’s lower than the current room temperature and wait 3 to 4 minutes. Get shopping advice from experts, friends and the community! This is a resubmit question for a sears upflow wall furnace Model #867. Try changing the thermocoupler first, (the copper tube heat sensor at the pilot light) They run about $10 at most any hardware store. 88 °F (31 C) during programming. Sometimes, home builders cut corners to save money when figuring HVAC unit size. The guy never went outside to have a look. Note: If your thermostat fan is set to ON, your furnace isn't actually running non-stop—just the blower fan is. Boiler thermostats set the temperature of the water that will be pumped to the radiators. As the fine ore injec-tion amount increased, the productivity increased from 2. I have been looking around online and a relay could be poss. Furnaces are designed and built to last many years, but none of them keep running forever. A clogged air filter restricts airflow through the furnace. I've checked to make sure the thermostat is on AUTO but it won't turn off unless I lower the temperature manually. The furnace will run for eight to ten minutes, and then the RV will be at a comfortable temperature for moving around and starting your morning. Malfunctioning Thermostat – A faulty thermostat can cause your AC fan to run constantly by not knowing when the desired temperature has been reached. Electronic Ignition Gas Furnace Problems Troubleshooting - Gas furnaces are a prevalent form of heat for homes and businesses, and occasionally a gas furnace needs to be repaired because of a problem with the gas furnace. If your furnace isn't staying on, your thermostat may not be calibrated correctly. A gas or oil furnace is designed for a 40-70 degree temperature rise as the air passes thru the furnace. Many RV furnaces are fitted with a time delay switch to handle the relatively high current needed to run the blower motor and to let the blower run for 45 to 90 seconds after the thermostat temperature is reached. If your furnace quits or breaks down try these eight simple solutions before you call for service help. It does this repeatedly and never actually heats the house. I have a 2005 Monaco La Palma and the furnace will not work in very cold weather. Finally, the size of your system might be the issue. Is it just the fan that is still running, or is the hvac/heat unit still running? If it is just the fan, make sure the fan is set to "Auto". Boiler cutting out before CH temp reached. When it shuts off due to high temperature, you should check filter condition first. The furnace is not running at this point, say Indoor temperature is 20. Once interior heat reaches the chosen temperature, the furnace system will go into a "sleep" mode. until the furnace has reached the fan on temp of the fan control. This furnace instead of having an off and on sequence can actually run at two speeds. Thermostat set on 70, and reading 72. The fan is turned off about a minute after the desired temperature is reached. setpoint reached? Report This by Manage My Life. At least when the furnace broke last winter, you got cold for free. Free reving (or worse - racing) on an engine that has not fully reached it's oil operating temperature is extremely dangerous. This switch may power the low-voltage thermostat as well as the furnace. Second, if the furnace stays on after the temperature is reached, the thermostat may be faulty; however, the fan is supposed to keep blowing until the furnace temperature comes downanother safety feature. If you’ve noticed that your furnace keeps running even after it reaches the temperature on your thermostat, or if it keeps running but never reach the target temperature, it could be costing you in the form of higher heating bills or prematurely worn out heating equipment – two things you definitely want to avoid. The reason cold air will continue to blow while the furnace is on and the thermostat is set correctly is because the fan assumes that heat is being generated by the furnace even?if the burner is not running. Furnaces are selected to fit your home perfectly. Insured technicians keep furnaces functioning as efficiently as possible by performing basic maintenance and clearing air ducts Furnace Tune-Up and Duct Work - Colorado Discount Heating and Cooling | Groupon. When your thermostat calls for heat, the zone valve will open up, there is a set of contacts on the zone valve that will close when the valve opens up, that will kick the circ pump on, the aquastat will sense the drop in heat and kick the burner on. I finial decided to turn it off from the thermostat and still the furnace stayed on. in your house would proably be 78 to 80 degrees. The unit usually smokes a bit at first which could be a problem inside your house. The furnace switch is usually mounted on a wall near the furnace, or sometimes even on the furnace itself. (only after 7 years!) it keeps letting the temp drop.