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