Furnace Blower Running With Thermostat Off

If the draft blower fan on the front of the wood furnace is the one that is running all of the time feeding the fire. There is a Honeywell thermostat type thing mounted on the furnace and I was wondering how it is supposed to work. If it's hooked into HVAC system, then you do need to run the furnace fan continuously to get the benefit of the ventilation system. Air conditioner is turned off but fan keeps running. What is wrong if you turn the thermostat to off but the furnace is still running? When you say the furnace is still running, I take that to mean the fan and not the actual flame portion of the. You run this cord outside to your generator, start the generator and once it is sufficiently running you plug the furnace in and use it like you normally would, go to the thermostat and crank up the heat. when running the heat-pump the air blowing from the heat ducts is not hot ( it's to cold for the heat-pump). I open the thermostat and see the jumpers, but is there a way you can illustrate my brain and the correct set up I have an Amana 16 seer 2 stage 5 ton. In this case, your A/C unit will continue running. you have a main furnace and it won't turn on ( is thermostat selected for this source. Fan On: With the furnace switch still Off, go back to the thermostat. If the air conditioner still won’t work, make the call. The furnace blower continued to run, even when I set the thermostat to off and the temperature to the lowest setting. • Blower runs for 15-30 seconds then burner will fire up. When you’re searching for a qualified heating or air conditioning contractor in Metro East Illinois, you need someone who can get to you quickly. This is a sign of an electrical problem with the capacitor. Hold your filter up to a light source — if light cannot pass through easily, it should be cleaned or replaced. During a call for heat, the system does not provide adequate heat for the home. com and AmericanHVACParts. Reset thermostat from ON to AUTO. If your furnace won’t kick on, check the pilot light. Be sure that you have changed your filter in the furnace recently. Make sure the thermostat is set properly to trigger the furnace to initiate and the blower to run. The limit switch shuts off the furnace if the air in the plenum gets too hot. Your fan limit switch is located directly under your furnace hood and controls when your furnace blower turns on and off. It's normal for burner to cycle on and off. Some HVAC technicians also state that it is better for the fan motor to run continuously instead of turning on and off with the furnace. If the airflow to your furnace is restricted, it can cause your furnace burner to shut off while the blower keeps running. Out of nowhere, my furnace blower came on (without heat). If there is no change and the air coming through the vents is warm, contact your local Trane Comfort Specialist™. To stop the furnace, first try turning down the thermostat. Why does my blower continue to run after the air conditioner has shut off? The thermostat is set on auto but the blower continues to run, any ideas? Update: The blower runs continuously and never shuts off even though the compressor and condenser fan have shutdown. While tinkering with the furnace, I noticed some sort of module in the furnace that seemed to have time. For cooling, the furnace usually selects the high speed of the blower. Your thermostat may be an analog type or it may be digital. It is an older furnace and I have checked the thermostat settings. (York ) with wheel OFF 1100 RPM: Wheel ON 1075 It is commonly referred to as a run capacitor. Even with the thermostat turned to off the blower runs constantly. ” The whole heating or cooling system adapts its running speed to your temperature demands, and usually runs at a slower, more continuous speed. If it looks okay, examine the oil supply. No insects or debris in contactor. First the burner will shut off followed by the blower. TELL ME MORE. However, as the HRV system runs continuously, why do I need to run the furnace blower continuously? What would be the potential problem if I put my furnace fan in an auto mode?. I couldn't seem to get it stay fired and running. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack. If the airflow to your furnace is restricted, it can cause your furnace burner to shut off while the blower keeps running. Each time the furnace failed to start the temperature in the house was not much lower than 62 f which tells me that the furnace had. Fan-off timings are adjustable. I will look moreit is possible that in 1978 they didn't have this switch? Meaning furnace must run off of 12v even if 110 is available? Question: If the Thermostat is 12v and the blower is 12v like you state in your first reply, wouldn't I need a power inverter to turn 110 into 12v?. In case the furnace turns off when the thermostat is turned to off, a. So how does a thermostat limit switch work? Great question! Thermostat limit switches work by opening and closing a circuit at 2 predetermined temperatures. To provide more specific information to help with your issue we would need the make, model and year of the heater as well as the RV. Turn up the thermostat for the furnace, and wait for the furnace blower to start up. Check to make sure the thermostat is set to AUTO, not ON. How to Turn Your Oil Furnace Off for the Summer. The gas valve stay open until the plenum reaches the high limit set point then shuts off. Reset thermostat from ON to AUTO. If the blower lights initially and then drops then it is being told that it is up to temp and not needed. Atwood Hydro Flame turns off heat but fan keeps running. The limit switch is designed to detect the temperature inside of the furnace. Solution: Test to make sure you are getting 24 to 28 volts AC between the G (green) and C (com) terminals on you fan center or control board. TOLL FREE 1 844 73PARTS. Until at some point a day or two or more days later when it is time to warm the house back up the furnace is off. Re: furnace won't shut off The furnace thermostat controls a relay box that is located (strangely enough) in the main A/C unit that's over the kitchen island in your Rushmore. The advanced settings and configuration options detailed in this document are intended for professional installers only. The stock furnace controller has one major design flaw; it attempts to light the furnace three times, if it fails to light three times in a row, the furnace goes into a fault mode. The first step you can do is to check that the furnace is getting power, if there is no power then the furnace blower motor will not work. If you have a newer furnace with an electronic control panel, you may need to reset the system. Furnace blower keep running without thermostat turn on On 2016-12-04 by Bill The fan runs perfectly in the AC mode and in manual but will not start when the fan control reaches the desired set point. If the switch is not allowing the blower to turn off, this part will need to be replaced. The most common reason for the blower continually running on your heater is that the activation switch on the wall for fan control is set to "manual". Here's a burning question we hear from Lawton, Oklahoma homeowners: "Why won't my furnace shut off?" To answer this, we need to know what you mean by that since it can be interpreted in different ways. This extra strain can lead to system failure and expensive repairs. Then two minutes later it comes on again. Re: furnace won't shut off The furnace thermostat controls a relay box that is located (strangely enough) in the main A/C unit that's over the kitchen island in your Rushmore. The switch on the front of the stove monitors firebox temp and will not start furnace blower until low limit is hit. The burners on a furnace cycle for approximately 3 to 4 min. Installed the Nest, and it seemed like my furnace was cycling on and off. When it was 75 degrees, I realized we had a problem. if the blower motor is old and does not turn easily, then it probably needs to be replacedbe certain to replace gaskets and make sure that every thing fits flat where it shoulddon't put gas into the furnace on your bench until you have completely cleaned it out and made sure that everything is running properly. With the furnace running turn off the switch. IF there is not enough air to return, the Hi temp switch will kick out and stop the Flame, until the chamber cools down. Each time the furnace failed to start the thermostat indicator showed the furnace should be running. Turn the furnace off (using the thermostat) and back on, this will give the furnace two more attempts to light the propane. I have a Tempstar 7000 furnace. Once the thermostat setting has been reached, it opens and causes the gas solenoid to turn off the gas supply. I have to go upstairs to the hallway and unplug the furnace from the outlet to shut off the fan. Thank you for using Manage My Life. A furnace blower not running is cause for furnace repair. Make sure furnace blower door safety switch is pressed in when testing. Furnace Turns On and Off Too Often. This is preventing a new heat cycle from beginning. Tip #1: Check Thermostat Setting There will be a fan setting at your thermostat that controls the blower. When you’re searching for a qualified heating or air conditioning contractor in Metro East Illinois, you need someone who can get to you quickly. Before troubleshooting your thermostat, check to see if all filters are clean and all hoses to and from the units themselves are free of wear. If the blower is running but no heat is coming out, replace the filter. But what is that setting for? What does it do? A heat pump. Set the thermostat to "heat" and set the fan to "auto. Forum discussion: Does anyone have an idea why the blower in my furnace runs 24/7 with the heat completely off. On cooling, the fan will run only when the air conditioner is running. Turn up the thermostat for the furnace, and wait for the furnace blower to start up. Note: It's not the blower "fan on" on the main thermostat. The blower continues to run until the temperature in the plenum reaches 90 degrees F, and it turns off the blower by opening. Eventually the furnace just went into a mode where the blower will run constantly but now it won't ever ignite. Our Armstrong Ultra SX 80 furnace blower won't stop running. Lower the thermostat in order to stop the furnace. Found a pack rat working/building on top of furnace/duct work. This device, called a heat anticipator, tells the thermostat when to turn off the furnace burners. Also, would turning the thermostat down while the heat and fan are both on cause the fan to keep running when the heat goes off? That's the only thing I've done that might possibly have some effect. if the blower motor is old and does not turn easily, then it probably needs to be replacedbe certain to replace gaskets and make sure that every thing fits flat where it shoulddon't put gas into the furnace on your bench until you have completely cleaned it out and made sure that everything is running properly. My Gas Furnace Comes On And Off Too Frequently • Adjust the thermostat heat anticipator • Troubleshooting a Thermostat • Replace dirty air filter How to inspect, repair or replace the Blower Fan Belt on a furnace: Regularly inspect blower-fan belts for any sign of damage and replace the belt if it's damaged. If you have your furnace (again, or air-conditioning) fan set to "Auto," your system's fan. The Blower Runs Non-Stop. I have the thermostat to off and then flip back on the breaker and furnace is at full heat. The only way to shut off the blower motor is to shut off the power to the furnace via the "light switch" mounted on the outside of the furnace. Furnace will not light - Blower does turn on. Maybe done by the thermostat, if you don't have the sensor. Air Conditioning Parts In Furnace & Condensing Unit thermostat,defrost board,compressor,grill,cover,time delay,hard start,microfarad, fan motor,blower motor. When switch the breaker back on, the heater will work properly for a short time and then do it again. A clogged filter may cause the furnace's blower to run continuously because it can damage the furnace's limit switch. 5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. While checking the thermostat, the technician observes the burner shuts off by removing the wire on the R terminal on the thermostat subbase. An easy, push-button ignition and thermostat controls allow you to quickly and efficiently heat a room while maintaining a consistent temperature and with no need for electricity, it makes a great choice during power outages. The thermostat is showing an internal temperature of 25, yet I can still feel air coming out of the vents. When the cover is off, can you detect any unusually cool or warm air coming through from the wall space?. HOW A FURNACE WORKS A typical forced air or warm air furnace burns a fossil fuel and distributes the warm air inside your home. It operates the A/C Compressor or heat calls properly based on cycling when the tempature calls for it, but the fan now continually runs, even with the thermostat switched off- unless I remove the thermostat from the wall (prior to fixing shorts the blower would still continue to run, even with thermostat removed from wall). This is a sign of an electrical problem with the capacitor. is -12) in Minneapolis and the furnace would run for 12 minutes on low fire, 3 times per hour. Most of the manuals for the models I've been looking up mention "furnace interlock" as an option which turns on the furnace blower when the HRV is running. Blower control set wrong. The fan must be on at the thermostat for it to operate. Clean or replace filter. If the condenser coils are coated with dust or debris, use a garden hose to wash them off. FAQs on why the forced air heating or cooling air handler troubleshooting: blower fan won't shut off: Frequently-asked questions about what to do when the furnace blower or air conditioning blower fan won't stop running when it should. Furnaces in an RV aren't all that different than a gas-fired forced air furnace in a residential application. Many modern HVAC systems now come with variable-speed blower motors that provide similar benefits to running your thermostat fan on "on. Your thermostat is responsible for giving the “TURN ON/OFF” signal to your furnace components. The furnace blower must run for 30 seconds after it comes on for the burner to fire up. If the condenser coils are coated with dust or debris, use a garden hose to wash them off. Check the thermostat to see if the Fan switch has been turned on. I put a new blower board in the furnace yesterday, along with a new contactor in the condenser. If your thermostat is wired incorrectly, this could explain why the unit refuses to shut off. The fan must be on at the thermostat for it to operate. Check the setting on the thermostat. Only the inducer motor cuts off for this 1 second time period. The furnace is factory. Blower off delay—When thermostat is satisfied, the R-W/W1 signal is terminated, de-energizing gas valve (stopping gas flow to burners) and HUM terminal is de-energized. Blower Continuously Runs: This could indicate a faulty limit switch, and it’s recommended you have a professional look the unit over. A gas furnace should turn on. If this is the case, take a look at the air filter. It only stopped when I turned off the power to the furnace – but came back on when I restored power. While tinkering with the furnace, I noticed some sort of module in the furnace that seemed to have time. • The furnace will run on low stage for a fixed period of time before stepping up to high stage to satisfy the thermostat’s call for heat. If the switch is not allowing the blower to turn off, this part will need to be replaced. After a power outage, my Carrier Gas Furnace blower motor will keep running, long after the burner has go out and cold air is coming out of the registers. Forum discussion: Does anyone have an idea why the blower in my furnace runs 24/7 with the heat completely off. If you have your thermostat’s furnace (or air-conditioning, for that matter) fan set to “On,” the fan will continually run, regardless if your furnace is running through a heating cycle, i. “Auto” fan mode turns the blower on and off in time with the cooling and heating systems. In this case, your A/C unit will continue running. Is this normal? I expected the furnace to stop running once the temperature rose above threshold. REMEMBER: Turn off your furnace's shut off switch (found on the furnace) and set the thermostat to off before changing the air filter. Also, would turning the thermostat down while the heat and fan are both on cause the fan to keep running when the heat goes off? That's the only thing I've done that might possibly have some effect. In addition to heat, cool, and off, there's a setting for emergency heat. This will continue till the internal low temperature reaches the preset value that's set on this device. Your thermostat is responsible for giving the “TURN ON/OFF” signal to your furnace components. Blower Continuously Runs: This could indicate a faulty limit switch, and it’s recommended you have a professional look the unit over. Even after I turn the power off to the furnace, as soon as I turn it back on, the blower begins to run. HVACpartners. The 'off' function should shut down the furnace after 30 seconds or so. Some common symptoms exhibited by your furnace may actually be due to a faulty thermostat. Keep your home comfortable and energy efficient by tracking the usage of your HVAC system. Once the home's temperature aligns with the thermostat setting, the furnace shuts off. It is an older furnace and I have checked the thermostat settings. Furnace blower runs all the time? This video provides information on how to troubleshoot a furnace blower that runs continuously and the most likely defective parts associated with this problem. Better Comfort and Efficiency. If the contact that controls the blower motor sticks closed, it will send continuous voltage to the blower mot or, causing the motor to run continuously. INTEGRATED FURNACE CONTROL TROUBLESHOOTING GUIDE GO TO E NOTE: Always verify gas valve inlet and outlet gas pressure. My particular furnace model is a Trane XR80. Now the heat will tu. Turn the thermostat up to high, and wait until it kicks on and is running. does it turn off a while after it starts heating? this is normal, if it is a gas furnace, then the furnace is using the air to cool down the combustion chamber and to prevent wasting heat. KEY TO ABBREVIATIONS IBM = Indoor Blower Motor IDM = Induced Draft Motor IFC = Integrated Furnace Control PS = Pressure Switch(es) SE = Spark Electrode DSI = Direct-Spark Ignition FLAME (AMBER) LED CODES OFF = No Flame Presen t. Turn gas supply “On” at gas control and at external shut-off NOTE: Blower will run for 90 sec if thermostat is Read Content. if it is electric, then it is using the air to cool off the elements. Reset thermostat from ON to AUTO. When the temperature in the furnace falls to 82 F, the FST opens and turns the blower off. If you drop the filter cover and filter, you'll see the square box with about 4 connectors plugged in. That’s why I published with the headline “Nest Says Shut-Off Heat Not Its Fault, But Pushes Thermostat Update To Fix 4. It has a dial with off/on/off which appear to be set at 100/150/200, but the blower runs regardless of the temp. See Figure 1. Furnace Turns On and Off Too Often. please tell me what i should do. However, as the HRV system runs continuously, why do I need to run the furnace blower continuously? What would be the potential problem if I put my furnace fan in an auto mode?. by Sam (Indiana) Question: I am troubleshooting a furnace problem with my Atwood Hydroflame RV furnace. During a call for heat, the system does not provide adequate heat for the home. (That's where a tech will start first, so you should as well. And doesnt have a manual switch on it to turn it on or off. A dirty air filter blocks airflow over the furnace's heat exchanger, causing it to overheat. and heat cycle will not. After the visual inspection, turn the thermostat off and flip the power switch off on the furnace (or turn off the breaker if the furnace doesn’t have a switch). Short cycling is when the furnace will kick on for a few seconds, then shut off for a few seconds, then back on, then back off, repeat indefinitely. If your blower squeaks or whines when it’s running, relax. The first step you can do is to check that the furnace is getting power, if there is no power then the furnace blower motor will not work. If this is the case, take a look at the air filter. When your furnace operates “on then off ” for only very short periods of time, it is known as short cycling. The BCC (blower control) is a printed circuit board. The Inducer Motor Assembly replacement kit can be motor. A technician may have to recharge the refrigerant. Let it run a couple of minutes. I assume it has the blower? then the unit outside was shut down after 14 hours of running constantly nonstop. The air is taken back to the blower through the return air ducts to the furnace and is then. My Furnace Won Turn On Aprilaire Whole-House Humidifier Service Manual Activate the furnace blower by setting your thermostat fan switch to the “On Turn the control dial setting to the “Off” position. If you have a newer furnace with an electronic control panel, you may need to reset the system. I have a suburban nt-24sp furnace that runs some of the time and then kicks out and the blower stays running. Problems can show up as a furnace that produces no heat, wild temperature swings, or cycling on and off too often. When switch the breaker back on, the heater will work properly for a short time and then do it again. As long as the RV's batteries have sufficient voltage and amps, and there is. Your furnace will run until it satisfies that preset temperature. It may sounds like it's coming from the heat exchanger area and not the blower, then it could be a new filter you put in is too thick and there's not enough air flow so the motor is working harder, and vibrates due to the higher. What this part does I'm not sure?? Only, the unit outside continued to run and the furnace. No filter is new. If the air conditioner runs constantly, here’s what to do: Turn up the thermostat. Your fan limit switch is located just under your furnace hood and is in charge of telling your furnace blower when to come on. Purge the air by turning on other appliances (like a cooktop) that are further downstream from the propane tanks. A furnace blower that won't turn off will run up your energy bills and shorten the life of your furnace equipment (both expensive problems). 2) Check your thermostat. If the air here gets too hot, the limit switch is set to shut off the furnace. Furnaces in an RV aren't all that different than a gas-fired forced air furnace in a residential application. Then, turn the thermostat to a temperature that's lower than the current room temperature and wait 3 to 4 minutes. When you run a standard furnace, the gas valve opens at high, so the flame or burner is fully loaded. If the draft blower fan on the front of the wood furnace is the one that is running all of the time feeding the fire. If you have an inficon controller then it could be one of the settings in the installation process. In this way you can use your generator and fuel more wisely and only as needed. , whenever your furnace is actually producing heat. During low-output mode, the blower motor will run slower, less cfm output, yet the air delivered into the conditioned spaces still feels hot. When lockout occurs, the spark stops, the voltage from the module board to the gas valve is discontinued, and the valve closes. Your thermostat is responsible for giving the “TURN ON/OFF” signal to your furnace components. You can use whichever thermostat controls it and set the thermostat way up. Forum discussion: Does anyone have an idea why the blower in my furnace runs 24/7 with the heat completely off. It's possible your furnace will run when the blower motor is off; however, that's rare. My thermostat is connected to the C on the mainland, so I know the circuit board is restarting. problem is furnace starts up and runs fine, but won't shut off at the desired temp. Here are some of the things that you should keep in mind with Goodman furnace troubleshooting issues: Examine the settings on the thermostat. The furnace is in the attic and the abnormal running seems to be related to the attic temperature. 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. While tinkering with the furnace, I noticed some sort of module in the furnace that seemed to have time. A clogged furnace filter can cause a furnace to shut off. Check the thermostat and ensure it is set properly. If you see or hear the fan turn on, your blower motor is not the culprit. Fan speed for heat is set off of furnace temp rise, AC is also set for a proper cfm, this should have been done when installed. In case the furnace turns off when the thermostat is turned to off, a. SHOW ME HOW MUCH A NEW FURNACE SHOULD COST. Troubleshooting Furnace Blower Not Running. Technician A has determined that a new thermostat has been installed and the heat anticipator was incorrectly adjusted. Your oil furnace may have become dysfunctional on account of a broken heating monitor. 0 Problems”. 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. I'm fairly handy and feel comfortable troubleshooting and fixing stuff, but I'm a complete n00b when it comes to furnaces. Turn off the furnace power and repair a short or replace the pressure switch. Usually happens at night when I'm sleeping. If he has his thermostat set for 65 and the house is 80 in a room, then he could manually turn on his blower through the thermostat to see if anything improves. Make sure the thermostat is set properly to trigger the furnace to initiate and the blower to run. A Standard Furnace cycles on and off frequently, so that you might typically experience temperature swings of 6 degrees or more in pockets of your home. 115 Volt 4 Speed Furnace Blower Motor. When proper temperature is reached the burner will cut off, blower will continue to run for a short time. This switch detects the temperature of the furnace and tells the blower when to turn on and off. Most of the manuals for the models I've been looking up mention "furnace interlock" as an option which turns on the furnace blower when the HRV is running. Tip #1: Check Thermostat Setting There will be a fan setting at your thermostat that controls the blower. • When proper temperature is reached the burner will cut off, blower will continue to run for a short time. It may be that your home has reached the correct temperature, but the thermostat is not registering the conditions in the home. The most common reason for the blower continually running on your heater is that the activation switch on the wall for fan control is set to "manual". It is an older furnace and I have checked the thermostat settings. If you furnace filter is clogged, the airflow will be restricted. If your furnace won’t kick on, check the pilot light. How to Wire a Thermostat to Run Only the Fan. Initially, the burner will turn off and then the blower would turn off as well. There are such thermostats available in the market that gives you Low Medium High fan speed control for your furnace, But usually they are used in commercial space. The gas furnace blower has a honeywell mini zone controller. I can turn the motor off at the motor and/ or if I take the fuse out the furnace shuts off. If yours is analog, there may be a switch along the outside edge. And a new thermostat the following year (08). ” The whole heating or cooling system adapts its running speed to your temperature demands, and usually runs at a slower, more continuous speed. The burners on a furnace cycle for approximately 3 to 4 min. REMEMBER: Turn off your furnace's shut off switch (found on the furnace) and set the thermostat to off before changing the air filter. Many modern HVAC systems now come with variable-speed blower motors that provide similar benefits to running your thermostat fan on "on. Started having a problem last week where there tstat would reach temperature with the heater on, then tstat would quickly click twice and blower would keep running. Technician A has determined that a new thermostat has been installed and the heat anticipator was incorrectly adjusted. Turn off the furnace at the circuit breaker. The Williams Furnace Co. In some models, simply replacing the battery may do the trick. Finally, Test the Blower Fan. Today 1/9/2012 I called for heat and run the unit for 45 minutes. So, when the switch is working correctly, your furnace fan should turn on several minutes after thermostat calls for heat and turn off several minutes after the heat cycle ends. If you have an inficon controller then it could be one of the settings in the installation process. The other reason the blower does not turn off could be because of the control switch on the fan. Virtually every gas furnace produces some Carbon Monoxide, which is usually carried away from your home through the furnace's venting. Don't see any bad wiring connection. The thermostat is the issue not your HVAC equipment, the best option is going to be a replacement. It's normal for burner to cycle on and off. Each time the furnace failed to start the thermostat indicator showed the furnace should be running. The blower will turn on even though the thermostat is not calling for heat. Your White Rogers may have a temperature differential adjustment setting, some do. I unplugged the furnace, took the Chronotherm III tstat off the wall, plugged the furnace back in and the blower keeps running. When a furnace does not work it may be caused by problems with the furnace or the thermostat. power to the blower motor. You should set your thermostat to automatic so that the blower may turn on and off as needed. I will look moreit is possible that in 1978 they didn't have this switch? Meaning furnace must run off of 12v even if 110 is available? Question: If the Thermostat is 12v and the blower is 12v like you state in your first reply, wouldn't I need a power inverter to turn 110 into 12v?. It only stopped when I turned off the power to the furnace – but came back on when I restored power. How to Wire a Thermostat to Run Only the Fan. If your furnace fan won't turn off, you most likely have one of these 3 problems: Your furnace fan limit switch is set to "manual override". Check to make sure the thermostat is set to AUTO, not ON. This wall furnace is equipped with an automatic thermostat that can be mounted on the wall or on the furnace cabinet and a matchless pilot igniter. Don't see any bad wiring connection. Blower continuously runs: A blower that’s always on may be the result of a faulty limit switch. The fan will run until the firebox is cool, maybe another 2 minutes. With the furnace running turn off the switch. *Please note this option is only accessible through the thermostat interface. Adjust the thermostat. The Blower Won't Stop Running. I toggle my dometic digital thermostat to furnace, I hear the relay in the overhead fan click, the blower start, and within 5-10 seconds the igniters ignite and hot air is blowing out of the ducts. My Electric furnace will not shut off. Stop the Furnace. 1 LED flash (blinking on and off) This means the furnace locked itself out because it tried to ignite three times and could not do so. The power can be cut to the furnace by a number of causes, including a recent lightning storm, an electrical outage or a power surge by another appliance in the house that has tripped a circuit breaker or safety switch fuse to blow or turn off to protect. Turn it to AUTO and see if that helps. DIY Furnace Maintenance. The Blower Won't Stop Running. The thermostat is not set to Heat or a high enough temperature. Fan speed for heat is set off of furnace temp rise, AC is also set for a proper cfm, this should have been done when installed. A heavy cast iron plate (fireback), placed in the back of the fireplace, gets very hot. I seem to have no control from the wall thermostat. I finally had to unplug the unit to keep it off. Furnace will not light - Blower does turn on. With heat pumps, there's an extra setting on the thermostat. Recommended Action Try turning off your thermostat controls for 1 to 3 hours to see if the system resets itself. Check to see if the fan switch on the thermostat is on. Last evening we were at minus 8 (design temp. B- when the thermostat signals the furnace to turn off the burners after reaching temperature this device allows the blower to continue running evacuating heat that is still inside the furnace.  If it is hot, then this is not your problem so move on. If the blower motor runs all the time, there are three common issues: The fan switch on the thermostat is set to "on" rather than "auto" Relays in the control board are stuck in the closed position, so the blower is getting a constant supply of electricity, and the control board must be replaced. The blower will continue to run for 60 to 360 seconds then shut off. Do this: Turn off your furnace at the thermostat, and check the furnace filter. In the case of a hot. Finally, Test the Blower Fan. (If the thermostat is in the "cool" position, the furnace blower should be running. Ensure that the blower motor in your furnace is running. No insects or debris in contactor. Your thermostat fan setting should be set to AUTO, not ON. If you own a gas furnace, keeping the unit in top running condition is important for the safety of the home's occupants. if the blower motor is old and does not turn easily, then it probably needs to be replacedbe certain to replace gaskets and make sure that every thing fits flat where it shoulddon't put gas into the furnace on your bench until you have completely cleaned it out and made sure that everything is running properly. Electric Furnace Runs Heat and Blower Constantly Blower Fan Motor Won't Shut off!- STEP by STEP Troubleshooting! HVAC Service- Furnace Won't Stop Running - Duration:. The 'off' function should shut down the furnace after 30 seconds or so. • The furnace will run on low stage for a fixed period of time before stepping up to high stage to satisfy the thermostat’s call for heat. Remove furnace blower and control access doors. Is the blower motor in your furnace or air handler running when your thermostat is activated?. Wood Stove Blower Motors Blower motors are important parts in modern furnaces as they move the cool or hot air from the unit into the area being regulated. furnace twinning control supersedes: 650. Now go to the furnace and look for a switch that should look like standard light switch that should be mounted near your furnace. I took the Nest back because I didn't think it was running right and I bought the ecobee because I did have sensor envy.