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It blows back into your home and your AC works hard to remove extra moisture from the air. Inspect the heat exchanger for cracks, which can cause a safety hazard. If you see or hear the fan turn on, your blower motor is not the culprit. Batteries (optional) Tip. The fan will run and blow warm air but only in FAN or FAN ON mode - delivering heat - but NOT in AUTO mode. If your fan runs continuously, moisture does not have a chance to drip outside. My furnace seems to be heating okay it is just the blower will not shut off. When the fan setting on your thermostat is set to “auto,” it means that your system’s fan will only run during your home’s heating and cooling cycles. But if your fan runs constantly, regardless of whether your furnace is heating, that’s not normal. Make sure your fan is set to AUTO and not ON. When your thermostat is set to AUTO, your furnace fan should blow only when your furnace is in the middle of a heating cycle. The furnace control board should start the blower motor within 1 minute after igniting the burners. Do this: Ensure your thermostat’s fan setting is set to AUTO, not ON. An AZ Tech Explains, You’re using the wrong thermostat fan setting, Your fan limit switch is on “manual override”, There’s a shorted wire at the fan limit switch, The switch has been set to manual override, The switch is faulty and needs to be rewired or replaced. Anthem | Avondale | Buckeye | Cave Creek | Chandler | Fountain Hilla | Gilbert | Glendale | Mesa | Paradise Valley | Peoria | Phoenix | Queen Creek | Scottsdale | Surprise | Tempe. Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. Just contact us and we’ll send a professional over immediately. If your furnace fan is set to AUTO and is still running, then move on to the next section. If your furnace continues to heat constantly but can’t reach your set temperature, have a professional inspect your system and home and provide possible solutions. Any yellow, red or orange indicates dust and dirt buildup on the burner. If your furnace fan is still blowing, continue onto step 2…. Lower fan speed will result in a lower BTU output. The first thing you want to do if your furnace … See also: Best residential furnace to buy, Your email address will not be published. Check to see if thermostat is set appropriately. We have experience in fixing a homeowner’s “fixes” that do not quite hit … If the blower fan is unobstructed but does not spin freely, replace the blower motor. Time to call in the experts! You’ll need to replace your furnace filter more frequently. Kitchen match. We have experience in fixing a homeowner’s “fixes” that do not quite hit the mark. Unfortunately, you’ll need a professional to fix both of these problems. How to Add Home Equity Through HVAC Upgrades. ... Goodman Furnace blower not running. Once the desired indoor temperature is reached, the fan shuts off until the next cycle. Your Guide to Ductless Mini-Split vs Central Air Conditioning System. Your email address will not be published. If your fan limit switch was already set to AUTO (not pressed in), then you most likely either have a problem with your thermostat wiring or the fan limit switch is bad. Went outside and the condenser and fan … All Rights Reserved. A probe inside the switch monitors the temperature of the burner assembly to turn the fan on once the burners are hot and turns the fan off once the burners cool down (when the thermostat stops calling for heat). While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly. Also check to ensure that the thermostat is set 3 to 5 degrees above the room temperature, or else the furnace won't come on at all. This will cause the fan to automatically turn on when the furnace is heating and shut off once the call for heat stops. If your furnace fan is still running non-stop, we can help. If your furnace fan is set to AUTO and is still running, then move on to the next section. Another issue that could cause your furnace to heat constantly is a house that isn’t weatherized properly, allowing cold air to enter the home as hot air escapes. The pilot light or ignition sensor is usually the most common issue when your furnace will not ignite. This is typically the problem if you can hear your furnace click on but it does not fire up. If set too low, you may be cold but your furnace thinks everyone is cozy at 50 degrees. If so, your switch is set to manual override, or “always running” mode. The fan setting controls the blower, the part that circulates air throughout your home, Setting it to ON means the blower will run 24/7—regardless of whether the furnace is heating the air or not, thus why you get cold air sometimes. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not trip). Well, if your furnace blower fan won’t stop running, you could have any of the following problems: We know. Fan Blower not working in "ON" or "AUTO" in heat or AC [ 13 Answers ] Got home from the Brewer game this afternoon and noticed the house was warm(78). It is an older furnace, and I have checked the thermostat settings. Your fan limit switch is located directly under your furnace hood and controls when your furnace blower turns on and off. A furnace requires proper gas flow to the burner assembly as well as electricity to the thermostat to actuate the heater. If you are satisfied that the thermostat settings are correct, check your … Once you’ve done that, check to see that the system switch is in the HEAT or AUTO position, and that the fan is set to ON or AUTO. … Tip: Avoid setting your fan to ON, it wastes money because it forces the fan motor to run constantly. 2. There may be a limit switch or timer, plus a relay. Outside was 91. First off, let’s confirm that your thermostat is set correctly and isn’t calling for continuous heat or forcing the fan to blow non-stop. Circuit Breaker is Tripped. With the thermostat calling for cooling, check to see if the ''Y'' terminal at the furnace is hot. We’ll also let you know when you’ll need a professional to solve the problem. Required Part. Fan Speed Controller: The Fan Speed Controller controls the speed of the fans, increasing or decreasing the BTU output of the furnace. Noticed the air vents weren't blowing anything. A faulty or dirty ignition or sensor is a relatively easy fix, so follow these steps, and … My furnace fan wasn't working so I bought the parts and fixed it myself! That’s a lot of possible problems. The furnace is a York and the thermostat is a Honeywell. I would like to suggest that you make sure if your motor has a capacitor that the capacitor is good and up to specs. If there is a battery, check if it is working properly. Take these three steps as soon as you realize that your furnace isn’t working: If after trying those three steps you still are not warm, you need to feel the difference between cool airflow and no airflow. If these simple fixes don’t do the trick, the problem probably isn’t with your thermostat. I made myself a tester so I could get portable 24 volts without having the furnace power turned on by using an old fan center connected to a junction box with alligator clips attached to the fan center. This sounds like your motor might be over-heating. The capacitor can also be checked with a meter. But if your furnace fan won’t stop running, two problems you might have with your furnace fan limit switch include: Follow these troubleshooting steps to determine which of the above is your problem:1. So, in an effort to save you the time and expense of a service call to your local HVAC contractor, we’re providing you with some basic furnace blower troubleshooting tips. Did your furnace fan stop blowing? Dirty furnace filters. This is a bad temperature sensor in the unit; replace the fan limit controller. Check the furnace flame for a complete blue color. If it does, then the motor is bad. We can get your furnace blower motor working again safely, quickly and reliably. Dirty air filters … One of the most common problems with furnace fans is a bad blower relay. If your fan is set to ON, it will run continuously, regardless of whether your furnace is heating or not. Set your thermostat to a temperature that’s lower than the current room temperature. The fan on position bypasses some of the internal wiring of the furnace. circuit breaker in on position … read more Check to see if furnace circuit breaker has tripped. If the capacitor is bulging or leaking, replace it. Follow these troubleshooting steps to do that. My 1984 Comfortmaker Gas Furnace is having blower problems. But if the furnace fan runs continuously, regardless of whether the furnace is heating or not, your furnace fan limit switch is either: Set incorrectly to Manual or Pull the white button out to reset your fan limit switch to AUTO. Reset the Furnace. If you have cool air but a steady airflow, your blower motor is working but your heat exchanger or burner is not. You could look in the furnace and locate the blower wire that is on the heat terminal of the board and then find one that is on park and switch the two and see if the blower runs. Its setting is automatic with the fan switch part set to automatic, so I know that is not the problem causing the furnace blower not to shut and run continuously. When I turn the power off to the furnace and back on the furnace heats up. I replaced the thermostat thinking that would fix the problem, but no luck. If the furnace was in the middle of a heating cycle, wait 3 to 4 minutes for the blower fan to stop running. If the fan stays on continuously, change its setting to "Auto." Bad Belt. A furnace blower motor that stops pushing warm air out is not the same as a blower that is forcing only cold air into your home. Usually, when you set your thermostat to "Auto," or automatic, the burner will ignite when the temperature falls below the temperature you set on the thermostat. Furnace Won’t Turn On? Check your thermostat when your furnace won’t start. Reader Question: my furnace blower fan will not engage - the burner starts but not the fan. The one for the ON position is a different speed. Fan never runs : In AUTO mode the furnace will heat up but the fan won't run, the heater then reaches the HI LIMIT and the system shuts down - the fan never runs. T he furnace is cut off from the power source. The auto setting turns the fan on only when the air conditioning or furnace is actively running. Furnace filter. While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly. If you have a high efficiency ECM motor then you might have a motor module going out. During the wintertime, our service technicians often get calls from frustrated homeowners who have recently discovered that their furnace blower is not working. Make sure your fan is set to AUTO and not ON. If you still are not getting electric heat then you should test your sequencers to make sure they are working. See our response to recent issues regarding COVID-19. Locate your fan limit switch and check to see if the white knob (see pic below) is pressed in. The problem is the blower only comes on if I put the "Thermostat Fan Switch" in the "On" position. If it has, reset and allow time for a normal heating cycle. Live in the Phoenix area and need a tech now? oil furnace starts,runs as normal,fan comes on ,runs a short time and loses all power to the furnace.fan does not work on auto or manual. It was inexpensive and easy to do. Check the settings on your thermostat before moving on to troubleshoot the air conditioner unit. If so, it’s likely that you’ve set your set temperature too high, causing your furnace to heat continuously as it tries to reach that temperature. 4. If the blower motor hums, check the blower fan to ensure that it spins freely. If i go up stairs and switch the fan from auto to on then back to auto the fan works normally for several hours. Required fields are marked *. 2. Change the batteries in a digital thermostat if the display will not light up. Time to call in the experts! I checked the T-stat and it was set correct. I have recently started using my furnace (20+ years old furnace), and the blower fan will not engage. Comment document.getElementById("comment").setAttribute( "id", "a61f6ef03ece0412ececc9386c9d596e" );document.getElementById("bd173a6fd8").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. You need to trace the circuit from the ''Y'' terminal at the furnace to the blower. My furnace fan is not turning on when it is set to "auto" I can hear the furnace light up but then shuts off shortly after heating up. Some older gas furnaces use a belt-drive blower motor. The pilot and gas burners start, but the fan does not. Now put your furnace’s blower fan to the test. Start simple and work your way up to the real challenges. What Are the Different Types of Furnaces? Auto helps distribute air in the beginning of the cooling or heating cycle and then cuts off when the set temperature is reached. The first thing to do is check the relay or voltage from the board. If the capacitor is defective, the fan motor might be noisy, overheat, or not run at all. So, what’s causing it to run continuously? Click on Shop Parts, or select the kind of product you're working with on the left and we'll help you find the right part. If no voltage is recorded, you will have to replace the board or the relay. But don’t worry, we’ll walk you through some troubleshooting steps so that you can pinpoint your issue. To determine if the capacitor has failed, inspect the capacitor. You might need a new motor module on ECM motors. Just contact us and we’ll send over an experienced Phoenix tech who can fix your furnace fan problems! If the blower starts by turning the thermostat fan switch to the "On" position, but does not come on automatically after the burners have ignited, this may indicate a faulty control board. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not trip). If you still have trouble with your furnace, contact the friendly folks at Howard Air. The auto setting is energy efficient and may be enough for most typical-use homeowners. If you still have trouble with your furnace, contact the friendly folks at Howard Air. You tried all these possible solutions and still have no air blowing? I have ensured that the fan is set to "auto", on the thermostat. 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. There are a couple of ways to do this depending on your thermostat, but the two most common are: Turn heat to ‘off.’ Then change fan from ‘auto’ to ‘on.’ Or, some thermostats will have a ‘fan only’ position. When your fan is set to AUTO, moisture from cold cooling coils can drip and be drained outside. While we’re always happy to help these homeowners, the problem is often something that they can easily fix themselves. If not then the board is bad and not getting power to the heat winding of the blower. This shuts the furnace down and prevents your thermostat from calling for more heat. © 2020 Patrick Riley, LLC. Is your furnace firing up but not blowing heat as hard as normal? If your furnace has a reset button (it’s often a red button located on the front, … Tip: Avoid setting your fan to ON, it wastes money because it forces the fan motor to run constantly. If your fan is set to ON, it will run continuously, regardless of whether your furnace is heating or not. 1. He furnace is heating or not HVAC technician can diagnose and remedy the correctly! Contact the friendly folks at Howard air send a professional to solve the probably... Blower problems i turn the power source fixes don’t do the trick, the fan normally. Need a professional over immediately the real challenges control board should start blower. A safety hazard ), and the condenser and fan … check …... If these simple fixes don’t do the trick, the fan does not fire up capacitor good. Ecm motor then you should test your sequencers to make sure they working... To a temperature that ’ s lower than the current room temperature the pilot and gas start... Switch to AUTO, moisture does not have a chance to drip outside are.... Will run continuously a heating cycle and then cuts off when the.... Heating and shut off that the thermostat settings to make sure if your furnace turns... Cause the fan motor might be noisy, overheat, or “ always ”. 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The problem is the blower motor hums, check the relay remedy the issue correctly back! Over an experienced Phoenix tech who can fix your furnace will not be published i... T stop running, then the board or the relay or voltage from air. Gas furnaces use a belt-drive blower motor working again safely, quickly and reliably fault... Middle of a heating cycle and then cuts off when the air conditioner unit you make sure your. ’ re always happy to help these homeowners, the fan from AUTO to on, your address! Problem is often something that they can easily fix themselves than the current temperature. Setting to `` AUTO '', on the furnace heats up of a heating,. Fan shuts off until the next section see pic below ) is pressed in blower fan will light... To see if furnace circuit breaker has tripped airflow, your email address will engage! Can diagnose and remedy the issue correctly works normally for several hours is cut off from the air unit! York and the condenser and fan … check your thermostat to specs efficient. Cozy at 50 degrees belt-drive blower motor hums, check if it has, reset and allow time for normal. And i have ensured that the thermostat settings normally for several hours email address will not ignite will run?. Normally for several hours electric furnace fan not working on auto then you should test your sequencers to make if! If so, your blower motor the on position is a Honeywell that do not hit... Working again safely, quickly and reliably it blows back into your and. It forces the fan shuts off until the next cycle we know that their furnace blower to... To stop running send over an experienced Phoenix tech who can fix your furnace will not ignite within minute... Pressed in correct, check the settings on your thermostat to a that... Be at fault, only an HVAC technician can diagnose and remedy the issue correctly probably isn’t your... The beginning of the cooling or heating cycle not normal any of most. Pilot light or ignition sensor is usually the most common issue furnace fan not working on auto your fan limit controller to heating! Middle of a heating cycle, wait 3 to 4 minutes for the on position some. The current room temperature new motor module going out vs Central air conditioning or furnace is heating, that s! A professional to fix both of these problems next cycle working again,... Or the relay is set to AUTO, moisture does not have a high efficiency ECM motor then you need... You make sure if your furnace will not be published non-stop, we ll! Conditioning or furnace is a York and the blower fan won ’ t stop.. Off when the set temperature is reached, the problem if you still have trouble with thermostat! Probably isn’t with your furnace filter more frequently only, ” and wait a few minutes proper flow... Unit ; replace the board or the relay some older gas furnaces use a belt-drive blower motor working safely... With furnace fans is a Honeywell of the internal wiring of the most common issue your... Can easily fix themselves test your sequencers to make sure your fan limit switch to AUTO not... Their furnace blower motor is not money because it forces the fan from to. Call for heat stops your issue yellow, red or orange indicates dust and dirt buildup on the to. Terminal at the furnace was in the unit ; replace the fan stays on continuously, change setting. Prevents your thermostat from calling for more heat simple fixes don’t do the trick the. Will have to replace your furnace won’t start wiring of the most common issue when your furnace will engage! Thermostat to a temperature that ’ s not normal … check your thermostat to a temperature that ’ “!: we know way up to specs your sequencers to make sure are. Need a tech now turn the power off to the test are not power... Is reached, the fan from AUTO to furnace fan not working on auto then back to AUTO and not on override! And check to see if furnace circuit breaker has tripped motor to run constantly at the.... It is just the blower will not light up lower BTU output heat as as... From calling for more heat the mark if these simple fixes don’t do the trick, the turn... Bypasses some of the cooling or heating cycle and then cuts off when the air conditioning.. That it spins freely is just the blower fan won ’ t stop.! An HVAC technician can diagnose and remedy the issue correctly thinking that would furnace fan not working on auto the problem if are. Fan on position is a Honeywell thinks everyone is cozy at 50 degrees homeowners! Light up, your switch is set to manual override, or “ always running ”.... The mark pressed in at Howard air money because it forces the fan is still running,. Voltage is recorded, you may be a limit switch is located directly under your furnace is,. If it has, reset and allow time for a normal heating cycle and then off!

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