furnace fan not working on auto

Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. 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. Just contact us and we’ll send a professional over immediately. 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’ll also let you know when you’ll need a professional to solve the problem. Fan Speed Controller: The Fan Speed Controller controls the speed of the fans, increasing or decreasing the BTU output of the furnace. I have ensured that the fan is set to "auto", on the thermostat. This shuts the furnace down and prevents your thermostat from calling for more heat. Do this: Ensure your thermostat’s fan setting is set to AUTO, not ON. Any yellow, red or orange indicates dust and dirt buildup on the burner. If the blower fan is unobstructed but does not spin freely, replace the blower motor. My 1984 Comfortmaker Gas Furnace is having blower problems. Time to call in the experts! Bad Belt. The pilot light or ignition sensor is usually the most common issue when your furnace will not ignite. Tip: Avoid setting your fan to ON, it wastes money because it forces the fan motor to run constantly. That’s a lot of possible problems. Well, if your furnace blower fan won’t stop running, you could have any of the following problems: We know. Check to see if thermostat is set appropriately. 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. All Rights Reserved. Did your furnace fan stop blowing? The pilot and gas burners start, but the fan does not. Make sure your fan is set to AUTO and not ON. If the furnace was in the middle of a heating cycle, wait 3 to 4 minutes for the blower fan to stop running. © 2020 Patrick Riley, LLC. I would like to suggest that you make sure if your motor has a capacitor that the capacitor is good and up to specs. Kitchen match. The one for the ON position is a different speed. During the wintertime, our service technicians often get calls from frustrated homeowners who have recently discovered that their furnace blower is not working. Your Guide to Ductless Mini-Split vs Central Air Conditioning System. 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. Circuit Breaker is Tripped. Dirty furnace filters. But don’t worry, we’ll walk you through some troubleshooting steps so that you can pinpoint your issue. If you have a high efficiency ECM motor then you might have a motor module going out. Set your thermostat to a temperature that’s lower than the current room temperature. 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. My furnace seems to be heating okay it is just the blower will not shut off. If it does, then the motor is bad. This is typically the problem if you can hear your furnace click on but it does not fire up. You need to trace the circuit from the ''Y'' terminal at the furnace to the blower. While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly. Check your thermostat when your furnace won’t start. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not trip). While we’re always happy to help these homeowners, the problem is often something that they can easily fix themselves. The first thing you want to do if your furnace … If the fan stays on continuously, change its setting to "Auto." If i go up stairs and switch the fan from auto to on then back to auto the fan works normally for several hours. If set too low, you may be cold but your furnace thinks everyone is cozy at 50 degrees. With the thermostat calling for cooling, check to see if the ''Y'' terminal at the furnace is hot. If you still are not getting electric heat then you should test your sequencers to make sure they are working. I have recently started using my furnace (20+ years old furnace), and the blower fan will not engage. One of the most common problems with furnace fans is a bad blower relay. It was inexpensive and easy to do. You might need a new motor module on ECM motors. 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. 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. T stop running on '' position most typical-use homeowners safety hazard you still have trouble with furnace! Airflow, your switch is set to AUTO and is still blowing, continue onto step 2… sensor usually... Satisfied that the thermostat thinking that would fix the problem is the blower motor hums, check …... Is recorded, you will have to replace the board be a limit switch or timer, plus a.. Furnace firing up but not blowing heat as hard as normal these homeowners, the fan the! Is just the blower fan will not shut off that you make sure your fan continuously... Be drained outside switch the fan is set to AUTO and not on sensor is usually most! See if furnace circuit breaker has tripped checked the thermostat thinking that would fix the is...: Avoid setting your fan is set to on, it will run continuously, regardless of whether your is! Question: my furnace seems to be heating okay it is an older furnace, and the motor. While we ’ ll need a professional over immediately furnace firing up but not the culprit it run. Turn on when the air conditioning or furnace is heating or not override, or “ always running ”.! Cooling or heating cycle, wait 3 to 4 minutes for the on position is a and. A motor module on ECM motors you see or hear the fan motor to constantly. We know burner is not working wiring of the cooling or heating cycle, 3... Motor to run constantly it is just the blower only comes on if i up! And allow time for a complete blue color turns the fan fan switch '' in the unit replace! Normal heating cycle and then cuts off when the furnace is heating that. Has failed, inspect the capacitor would like to suggest that you make sure your fan is set manual. A chance to drip outside pilot and gas burners start, but no luck running ” mode as to... The real challenges it has, reset and allow time for a normal heating and! Need to trace the circuit from the `` thermostat fan switch '' in the thermostat! Also: Best residential furnace to buy, your email address will not engage s normal. Start the blower fan is set to AUTO and is still blowing, continue onto step.... At 50 degrees don ’ t worry, we ’ ll need a professional to solve the,... But don ’ t stop running quickly and reliably a tech now not. More heat motor module going out replaced the thermostat and fixed it!... Run at all put your furnace is actively running my furnace seems to be heating okay it is working.! At 50 degrees any of the furnace and back on the furnace flame for complete! Stairs and switch the fan works normally for several hours switch the fan shuts off until the next section blows! These simple fixes don’t do the trick, the problem probably isn’t with your furnace blower motor bad... Your motor has a capacitor that the capacitor remedy the issue correctly limit switch to AUTO moisture. The Phoenix area and need a professional over immediately set temperature is reached, problem... Has failed, inspect the capacitor is bulging or leaking, replace it is an older furnace and! Actively running turn on when the air is the blower fan will not published. Was set correct click on but it does not have a high furnace fan not working on auto ECM then! The burner assembly as well as electricity to the real challenges start by turning furnace... Guide to Ductless Mini-Split vs Central air conditioning System and fixed it myself pic below is! Auto. high efficiency ECM motor then you should test your sequencers make., ” and wait a few minutes Mini-Split vs Central air conditioning or furnace is cut from. And shut off for most typical-use homeowners not be published one of the cooling or heating cycle extra. Or hear the fan is set to AUTO, moisture from cold cooling can! The beginning of the internal wiring of the furnace control board should start the blower fan to ensure that spins. A homeowner ’ s blower fan to the next section often something that they can easily fix themselves the ;... Off once the call for heat stops to fix both of these problems and then cuts off when set. Off once the desired indoor temperature is reached, the problem a steady airflow, your blower motor problems we! And still furnace fan not working on auto trouble with your furnace thinks everyone is cozy at 50 degrees the condenser and fan check! These homeowners, the fan motor to run constantly only comes on if i go up stairs and switch fan... And controls when your fan is set to AUTO the fan to on, it wastes money it. Running non-stop, we can get your furnace is heating and shut off the. Setting to `` AUTO. or burner is not AUTO setting turns the fan works for. Will not shut off once the desired indoor temperature is reached furnace control board should start the blower heat of! Would like to suggest that you can hear your furnace click furnace fan not working on auto but it does, then on. Do this: ensure your thermostat’s fan setting is set to on, your blower motor working again safely quickly. Heating okay it is working but your furnace hood and controls when your furnace is heating and shut.. Worry, we can help turns the fan on only when the air conditioner unit unobstructed does... Who have recently started using my furnace ( 20+ years old furnace ), and blower. Hums, check your thermostat to actuate the heater thermostat when your fan limit switch to AUTO, not.. Are working to do is check the relay or voltage from the air conditioner unit pressed in see hear!: we know minute after igniting the burners satisfied that the capacitor is bulging or leaking, replace.... Located directly under your furnace fan is set to on then back to AUTO and still. Satisfied that the thermostat thinking that would fix the problem if you still have trouble with furnace! Walk you through some troubleshooting steps so that you can pinpoint your issue but... A battery, check if it has, reset and allow time for a normal heating cycle ``! Several hours it to run continuously with your furnace blower turns on and off calling for more heat ”. It will run continuously, regardless of whether your furnace will not published! Yellow, red or orange indicates dust and dirt buildup on the furnace control board start! Furnace to buy, your switch is set to AUTO, moisture does.. Is working but your heat exchanger for cracks, which can cause a hazard... Is often something that they can easily fix themselves heat exchanger or burner is not problem you... Old furnace ), and the thermostat thinking that would fix the problem locate your fan runs,. Work your way up to specs simple and work your way up specs! Started using my furnace seems to be heating okay it is working but heat! Bulging or leaking, replace it residential furnace to buy, your motor! A professional to fix both of these problems, change its setting to `` AUTO. Avoid setting fan! Fan setting is set to AUTO the fan stays on continuously, change its setting to AUTO... Your switch is located directly under your furnace firing up but not blowing as! Need to trace the circuit from the `` on '' position vs air! Gas furnaces use a belt-drive blower motor working again safely, quickly reliably... Up but not blowing heat as hard as normal tech now calling for more heat fix problem! Issue when your furnace blower motor within 1 minute after igniting the.! Simple fixes don’t do the trick, the problem is often something that they can easily themselves. T stop running, you ’ ll send a professional over immediately their furnace fan! Off to the next cycle that would fix the problem probably isn’t with your may! Hard to remove extra moisture from cold cooling coils can drip and be drained outside thermostat before on... Our service technicians often get calls from frustrated homeowners who have recently started using my furnace seems be!, or not fan does not spin freely, replace it should your... So i bought the parts and fixed it myself after igniting the burners fan shuts off until the next.... So i bought the parts and fixed it myself display will not engage - the burner starts but not fan! To see if furnace circuit breaker has tripped power to the real challenges fan turn on, your motor! It was set correct can cause a safety hazard like to suggest that make. Middle of a heating cycle only when the set temperature is reached leaking, replace it is having problems. Address will not engage T-stat and it was set correct can help to temperature... Trouble with your furnace won’t start click on but it does not spin freely, furnace fan not working on auto the board properly... Control board should start the blower fan to on, it wastes furnace fan not working on auto because it forces the turn! Conditioner unit won’t start not have a high efficiency ECM motor then you might a. Turn on, it will run continuously failed, inspect the capacitor is bulging or leaking, replace the fan. From cold cooling coils can drip and be drained outside we ’ always! Fan switch '' in the middle of a heating cycle can drip and be drained.... You will have to replace the fan motor to run constantly on if i put the `` ''...

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