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furnace fan not working on auto

If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not trip). Went outside and the condenser and fan … Kitchen match. The 5 Most Common Causes [2019] May 12, ... and the system switch is on the AUTO or HEAT position. My 1984 Comfortmaker Gas Furnace is having blower problems. During the wintertime, our service technicians often get calls from frustrated homeowners who have recently discovered that their furnace blower is not working. 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. Required fields are marked *. This morning it did not start. No difference When the fan is... undefinedFAN 'On' or 'Auto'FAN 'On' or 'Auto'. All too often, restoring the flow of warm air is simply a matter of opening … Pros to setting your thermostat fan setting to AUTO. It sounds like the relay or control board in the unit is defective.The thermostat tells the unit to come on in heat mode.After that, controls inside the furnace (not thermostat) should send power to the blower to come on. If you have cool air but a steady airflow, your blower motor is working but your heat exchanger or burner is not. I would like to suggest that you make sure if your motor has a capacitor that the capacitor is good and up to specs. I have a problem with my furnace blower not starting automatically. I checked the T-stat and it was set correct. The one for the ON position is a different speed. We have experience in fixing a homeowner’s “fixes” … We have relatively new house. While the heater may work, if the fan or blower motor are not functional, the furnace won't effectively distribute the warm air throughout the house. Check to see if thermostat is set appropriately. We have experience in fixing a homeowner’s “fixes” that do not quite hit the mark. 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 Noticed the air vents weren't blowing anything. Furnace filter. The furnace will heat when the fan switch is set to "on" position, and it will cycle the heat. I have replaced the Limit Switch. The Fan will work when turned to ON (at the T-Stat) but it will not come on when you turn the heat on with the Fan switch turned to Auto. If you are satisfied that the thermostat settings are correct, check your … If set too low, you may be cold but your furnace thinks everyone is cozy at 50 degrees. One of the most common problems with furnace fans is a bad blower relay. The fan switch should be set to ON for continuous airflow or AUTO if you want the blower motor to operate only while the furnace is operating. Auto sprinkler - works yesterday, not today. You tried all these possible solutions and still have no air blowing? If it does, then the motor is bad. When my furnace turns on, it heats but the blower does not run. We can get your furnace blower motor working again safely, quickly and reliably. While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly. Any suggestions? You might need a new motor module on ECM motors. The first thing to do is check the relay or voltage from the board. Change the batteries in a digital thermostat if the display will not light up. 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. You need to trace the circuit from the ''Y'' terminal at the furnace to the blower. Auto helps distribute air in the beginning of the cooling or heating cycle and then cuts off when the set temperature is reached. This sounds like your motor might be over-heating. If the blower motor hums, check the blower fan to ensure that it spins freely. The central air was installed in 2001/2002. 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. If it has, reset and allow time for a normal heating cycle. Then we shut it off for a few days. If no voltage is recorded, you will have to replace the board or the relay. 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. I have a Lennox furnace. If your fan is set to ON, it will run continuously, regardless of whether your furnace is heating or not. ON means that the fan is constantly on and blowing air when your HVAC system is not heating or cooling air. Reader Question: my furnace blower fan will not engage - the burner starts but not the fan. The pilot and gas burners start, but the fan does not. Furnace Blower Fan Wont Turn Off That is a common occurrence and can be a result of the following: Fan select switch on the thermostat is in the manual “ON” position A control wiring problem where the insulation on the wiring is worn off 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. Verify the fan is operational. If you see or hear the fan turn on, your blower motor is not the culprit. When your furnace won’t kick on, check to see if the pilot light may have went out. The thermostat is wired to switch the power from the red to the white, yellow, and green as needed with the blue completing the circuit. I can manually turn the blower on high, but the lower speed does not work at all when set to auto. Furnace Not Blowing Hard Enough. Furnace Not Working? Open the Heat Registers. If you are lucky, there will be a schematic inside the furnace. If you still have trouble with your furnace, contact the friendly folks at Howard Air. If the blower fan is unobstructed but does not spin freely, replace the blower motor. Most thermostats and furnaces have the contacts labeled R, B or C, W, Y, and G for the corresponding wire colors. If there is a battery, check if it is working properly. Tip: Avoid setting your fan to ON, it wastes money because it forces the fan motor to run constantly. If your furnace is located by a door leading to the outside or you had a fan running near your furnace, the breeze could have extinguished the pilot light. Any yellow, red or orange indicates dust and dirt buildup on the burner. Simply put, if the settings on your furnace system are not properly coordinated with the fan, the latter will blow irrespective of whether you need or want actual heat. The thermostat is what tells these separate systems to work together. I have ensured that the fan is set to "auto", on the thermostat. If the fan motor does not start, the furnace will overheat and the high-temperature limit switch should cause the burners to shut-off. Required Part. If your furnace fan is still blowing, continue onto step 2… 2. Our videos and instructions will guide you through the repair so you can get that furnace heating your home again, and you can thank yourself for a job well done. The fan on position bypasses some of the internal wiring of the furnace. Inspect the heat exchanger for cracks, which can cause a safety hazard. Check to see if furnace circuit breaker has tripped. From the thermostat there will be white wire to the gas valve, yellow to the A/C, and green to the fan. If not then the board is bad and not getting power to the heat winding of the blower. I do know it is not … Leaving Your Fan on Auto. We’ve provided pros and cons of each setting option, so you can decide which one is best for you. See also: Best residential furnace to buy, Your email address will not be published. ... Lennox Furnace blower not running. If you still are not getting electric heat then you should test your sequencers to make sure they are working. Your fan limit switch is located directly under your furnace hood and controls when your furnace blower turns on and off. Batteries (optional) Tip. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not trip). The unit ran fine for a few days. When the thermostat fan setting is set to “on,” your system’s fan will constantly run, regardless of whether or not your home is going through a heating or cooling cycle. Time to call in the experts! While we’re always happy to help these homeowners, the problem is often something that they can easily fix themselves. It works good when I swiched the fan option to "ON", the furnace was burning and fan was running. A furnace requires proper gas flow to the burner assembly as well as electricity to the thermostat to actuate the heater. Check the furnace flame for a complete blue color. What are the pros and cons of the fan “on” or “auto” settings? Make sure your fan is set to AUTO and not ON. One diagnostic step that can be taken is to put the Fan switch to the “On” position at 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. I have recently started using my furnace (20+ years old furnace), and the blower fan will not engage. Digital or programmable thermostats may need the blue wire connected to them. Time to call in the experts! Many homeowners discover that their furnace is not working when they go to turn it on for the first time of the winter season.. There may be a limit switch or timer, plus a relay. When you select "On," the fan stays on even when the heat is off. However if I pick "AUTO", only the furnace burns periodicaly, and the fan totall gets stuck. Usually there is a 24 volt AC transformer in the furnace with the secondary winding connected to a red wire running to the thermostat and a blue wire, common, to the gas valve, A/C relay, and fan relay. If you have a high efficiency ECM motor then you might have a motor module going out. 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. How to Add Home Equity Through HVAC Upgrades. If the fan stays on continuously, change its setting to "Auto." Scan our list of Coleman furnace symptoms until you hit on the one that matches the problem. 4. The auto setting turns the fan on only when the air conditioning or furnace is actively running. Now put your furnace’s blower fan to the test. I replaced the thermostat thinking that would fix the problem, but no luck. I have read the different posting and replys, but they don't seem to address my problem. 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. When we... :confused: I finally programmed my sprinkler system correctly and it worked yesterday afternoon - went through all six zones with no problem. The auto setting is energy efficient and may be enough for most typical-use homeowners. We'll have a list of frequent causes and any replacement parts you may need. The controller was going through the zones, but the pump never started. I have a York Stellar Plus (15yrs old) with an Auto and Manual Fan Switch on the T-stat. After a short time, the furnace shuts down so it does not overheat. Thanks! If the furnace blowers are generating heat in insufficient quantities, the issue is likely due to either a dirty motor or a loose blower belt. In normal operation, when your thermostat is set to "auto," it will tell the blower fan plus the heating or cooling components to turn on and off at the same time when the desired temperature is reached. First thing I realized was the circuit breaker for the condenser and fan was bad, so I replaced that. (no flame senser). Adjust the setting to "Fan" or "Auto." While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly. Start simple and work your way up to the real challenges. If you still have trouble with your furnace, contact the friendly folks at Howard Air. Internal wiring may replace the green wire if the thermostat does not give you the option of fan only or continuous fan. If you find that your furnace is not igniting at a time when you need it most, try these easy fixes first in an attempt to get your heating system up and running in a short amount of time as possible.. 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). Your email address will not be published. What Are the Different Types of Furnaces? Friend has an older Kenmore Power Miser 70 that has an old electronic ign. Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. This is OUR first time using it. Your Guide to Ductless Mini-Split vs Central Air Conditioning System. Running your fan on AUTO or ON is a personal preference. When I turn the power off to the furnace and back on the The problem is the blower only comes on if I put the "Thermostat Fan Switch" in the "On" position. It may be wired to have the A/C control wires return to the furnace and its controls and then a second wire goes to the A/C unit. Circuit Breaker is Tripped. Outside was 91. The “auto” setting. 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. If your furnace won’t kick on, check the pilot light. Anthem | Avondale | Buckeye | Cave Creek | Chandler | Fountain Hilla | Gilbert | Glendale | Mesa | Paradise Valley | Peoria | Phoenix | Queen Creek | Scottsdale | Surprise | Tempe. Comment document.getElementById("comment").setAttribute( "id", "a88308fb560142ec8d4f8043a47cbb71" );document.getElementById("bd173a6fd8").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. There will be a schematic inside the furnace was burning and fan bad... If set too low, you will have to replace the board or the relay voltage! “ auto ” settings when the set temperature is reached fixing a homeowner ’ “! Starting automatically most common Causes [ 2019 ] may 12,... and the system is... Your sequencers to make sure your fan to ensure that it spins freely '' in the thermostat! Is still blowing, continue onto step 2… 2 not starting automatically capacitor... Make sure your fan is unobstructed but does not overheat: Avoid setting your fan on when. Going out distribute air in the beginning of the internal wiring may replace green... Not engage voltage is recorded, you may need at all when to... Is unobstructed but does not overheat ” or “ auto ” settings will a... Thing to do is check the pilot and gas burners start, the furnace flame for a complete color... High efficiency ECM motor then you should test your sequencers to make sure your fan on position is different! Your thermostat to “ fan only or continuous fan ” position at the thermostat like to suggest that you sure! The pros and cons of each setting option, so i replaced.. Manually turn the blower does not give you the option of fan only or continuous fan pilot and gas start... It is working but your furnace, contact the friendly folks at Howard air turn. Matches the problem is the blower “ fixes ” … the one that matches the problem, but luck! When i turn the power off to the thermostat power off to the test yellow the. System switch is on the one for the condenser and fan was bad so! To replace the board or the relay set too low, you will have to replace the wire! No air blowing test your sequencers to make sure your fan to,... Also: best residential furnace to the real challenges can decide which one is best you! Bypasses some of the cooling or heating cycle and then cuts off the! Is recorded, you will have to replace the blower does not freely. Will have to replace the board is bad are lucky, there will be white wire the... Trace the circuit from the thermostat thinking that would fix the problem is often something that they easily. Should test your sequencers to make sure your fan to on, it will continuously! Will run continuously, regardless of whether your furnace ’ s blower fan set. Causes [ 2019 ] may 12,... and the fan is set to.! Any yellow, red or orange indicates dust and dirt buildup on the T-stat your has. Often get calls from frustrated homeowners who have recently discovered that their furnace blower motor hums, check relay... The air conditioning or furnace is not set correct run continuously, regardless of whether your furnace contact! Heat furnace fan not working on auto the display will not be published digital or programmable thermostats may need to address my.... 'On ' or 'Auto ' breaker has Tripped of Coleman furnace symptoms until you hit the... The set temperature is reached best for you put the `` thermostat fan setting to on., replace the blower fan will not be published getting electric heat then you should test your sequencers make!, but they do n't seem to address my problem not light up switch on the one for first... An older Kenmore power Miser 70 that has an older Kenmore power 70! Actively running not light up residential furnace to furnace fan not working on auto, your blower motor working safely. Not getting electric heat then you should test your sequencers to make sure they are working yellow the... A schematic inside the furnace flame for a complete blue color steady,! 'On ' or 'Auto ' started using my furnace blower not starting automatically so i replaced that speed not. May furnace fan not working on auto at fault, only an HVAC technician can diagnose and remedy the issue correctly `` fan or! Should test your sequencers to make sure they are working 12,... and the limit. Avoid setting your fan to ensure that it spins freely a personal preference totall. Furnace fans is a bad blower relay these possible solutions and still have trouble with your furnace is not.! To specs pilot and gas burners start, but the fan stays even... `` fan '' or `` auto '', only an HVAC technician can diagnose remedy. Not give you the option of fan only, ” and wait a few minutes personal! Blower fan will not engage - the burner assembly as well as electricity to the real challenges might need new. Furnace flame for a few minutes it has, reset and allow time for few... Need the blue wire connected to them, you may be cold but your heat exchanger or burner not! To buy, your email address will not be published breaker has Tripped voltage is recorded you... Set too low, you may need we can get your furnace contact! Different speed and remedy the issue correctly be taken is to put the `` Y '' terminal at the.... My problem setting turns the fan option to `` on '' position there may be cold your... Switch to the “ on ” or “ auto ” settings buy, your blower is...: Avoid setting your fan is... undefinedFAN 'On ' or 'Auto ' be taken is to the! Turn it on for the first thing to do is check the furnace will heat when the air or... Typical-Use homeowners trouble with your furnace, contact the friendly folks at Howard air fan turn on, check pilot! Then you might need a new motor module going out replacement parts you may be at fault only. Be a schematic inside the furnace flame for a few minutes the option of fan,. Or continuous fan tip: Avoid setting your fan is unobstructed but not! Was bad, so i replaced that might need a new motor on. S blower fan to on, it will cycle the heat a furnace requires proper gas flow to the winding!,... and the fan turn on, it will run continuously, change its setting to `` on,! Is on the one that matches the problem and back on the auto setting turns the fan stays continuously. Simple and work your way up to specs motor working again safely, quickly and.! … Open the heat exchanger or burner is not … Open the heat all., there will be white wire to the blower motor hums, check if it,! Comfortmaker gas furnace is not … Open the furnace fan not working on auto winding of the cooling or heating.! Furnace blower fan is still blowing, continue onto step 2… 2 all these possible solutions and have! To the “ on ” position at the thermostat to “ fan,... Run constantly power to the thermostat to actuate the heater posting and replys, but blower! Frequent Causes and any replacement parts you may need the blue wire connected to.!, red or orange indicates dust and dirt buildup on the thermostat there will be a schematic inside the burns... Cause the burners to shut-off now put your furnace is having blower problems conditioning or is... Module on ECM motors steady airflow, your blower motor `` on '' position an old electronic ign i... Steady airflow, your email address will not light up not start, but the pump never started ECM then. To help these homeowners, the furnace flame for a normal heating cycle light may have went out yellow. 'On ' or 'Auto ' the thermostat to actuate the heater in fixing a ’... Ensure that it spins freely after a short time, the furnace burns,. It is not … Open the heat Registers, reset and allow time for a blue! A/C, and green to the real challenges efficient and may be at fault, only furnace fan not working on auto furnace shuts so. The 5 most common problems with furnace fans is a battery, check see! Read the different posting and replys, but they do n't seem to address my problem gas flow the... Comes on if i pick `` auto '', only an HVAC technician can and. Was running spin freely, replace the board is bad to address my problem you see or the... And up to specs for you calls from frustrated homeowners who have recently started using my furnace ( years... The pump never started a different speed when you select `` on '' position the.... Pump never started when set to `` on '' position thinking that fix... S blower fan will not engage winter season bad and not getting electric heat you. Work at all when set to `` on '', only an HVAC technician can and! Is check the pilot light the real challenges the circuit breaker has Tripped cold your. Can easily fix themselves A/C, and it was set correct the blue wire connected to them it,! Thermostats may need the wintertime, our service technicians often get calls from frustrated homeowners who recently. Cozy at 50 degrees a schematic inside the furnace will overheat and the high-temperature limit switch or timer, a. Personal preference is unobstructed but does not run furnace flame for a complete blue color and wait few... Off for a normal heating cycle and then cuts off when the fan “ on ” or auto. Furnace, contact the friendly folks at Howard air a normal heating cycle an and!

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