furnace fan not working on auto
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furnace fan not working on auto

furnace fan not working on auto

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

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