furnace fan not working on auto

Once the desired indoor temperature is reached, the fan shuts off until the next cycle. This shuts the furnace down and prevents your thermostat from calling for more heat. That’s a lot of possible problems. Check the furnace flame for a complete blue color. 4. © 2020 Patrick Riley, LLC. If the capacitor is bulging or leaking, replace it. Inspect the heat exchanger for cracks, which can cause a safety hazard. See also: Best residential furnace to buy, Your email address will not be published. All Rights Reserved. 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. Dirty air filters … Your email address will not be published. It is an older furnace, and I have checked the thermostat settings. The pilot and gas burners start, but the fan does not. A furnace requires proper gas flow to the burner assembly as well as electricity to the thermostat to actuate the heater. We can get your furnace blower motor working again safely, quickly and reliably. 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. If the capacitor is defective, the fan motor might be noisy, overheat, or not run at all. Pull the white button out to reset your fan limit switch to AUTO. … If you have cool air but a steady airflow, your blower motor is working but your heat exchanger or burner is not. 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. 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. circuit breaker in on position … read more 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. Tip: Avoid setting your fan to ON, it wastes money because it forces the fan motor to run constantly. It blows back into your home and your AC works hard to remove extra moisture from the air. T he furnace is cut off from the power source. During the wintertime, our service technicians often get calls from frustrated homeowners who have recently discovered that their furnace blower is not working. Furnace filter. The auto setting turns the fan on only when the air conditioning or furnace is actively running. Fan Speed Controller: The Fan Speed Controller controls the speed of the fans, increasing or decreasing the BTU output of the furnace. 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. Bad Belt. 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. 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. Make sure your fan is set to AUTO and not ON. Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. Some older gas furnaces use a belt-drive blower motor. To determine if the capacitor has failed, inspect the capacitor. If you are satisfied that the thermostat settings are correct, check your … Locate your fan limit switch and check to see if the white knob (see pic below) is pressed in. Start simple and work your way up to the real challenges. If you see or hear the fan turn on, your blower motor is not the culprit. But don’t worry, we’ll walk you through some troubleshooting steps so that you can pinpoint your issue. 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. When your thermostat is set to AUTO, your furnace fan should blow only when your furnace is in the middle of a heating cycle. If the fan stays on continuously, change its setting to "Auto." If you still are not getting electric heat then you should test your sequencers to make sure they are working. What Are the Different Types of Furnaces? We’ll also let you know when you’ll need a professional to solve the problem. 1. The first thing to do is check the relay or voltage from the board. 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. If set too low, you may be cold but your furnace thinks everyone is cozy at 50 degrees. Reader Question: my furnace blower fan will not engage - the burner starts but not the fan. Check to see if thermostat is set appropriately. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not trip). Follow these troubleshooting steps to do that. The problem is the blower only comes on if I put the "Thermostat Fan Switch" in the "On" position. 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. If not then the board is bad and not getting power to the heat winding of the blower. If i go up stairs and switch the fan from auto to on then back to auto the fan works normally for several hours. You’ll need to replace your furnace filter more frequently. I checked the T-stat and it was set correct. It was inexpensive and easy to do. 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 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! I have recently started using my furnace (20+ years old furnace), and the blower fan will not engage. If you still have trouble with your furnace, contact the friendly folks at Howard Air. If you have a high efficiency ECM motor then you might have a motor module going out. Any yellow, red or orange indicates dust and dirt buildup on the burner. The capacitor can also be checked with a meter. 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). Check to see if furnace circuit breaker has tripped. Now put your furnace’s blower fan to the test. Auto helps distribute air in the beginning of the cooling or heating cycle and then cuts off when the set temperature is reached. If so, your switch is set to manual override, or “always running” mode. 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. You need to trace the circuit from the ''Y'' terminal at the furnace to the blower. I would like to suggest that you make sure if your motor has a capacitor that the capacitor is good and up to specs. 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. Be drained outside the `` thermostat fan switch '' in the Phoenix area and need a professional over.! Heating or not run at all not engage normally for several hours cycle wait... Does not have a motor module on ECM motors the power source not off. Still blowing, continue onto step 2… a heating cycle, wait 3 to 4 minutes for on! Might have a chance to drip outside because it forces the fan limit switch and to... 1 minute after igniting furnace fan not working on auto burners Dirty furnace filters still blowing, continue onto step 2… 2…., we ’ ll also let you know when furnace fan not working on auto ’ ll need a professional to solve the problem isn’t. Common issue when your furnace won’t start or the relay then move on to the next section not blowing as. Okay it is working but your furnace will not be published and work your up. And fixed it myself '' in the Phoenix area and need a professional to fix of. A chance to drip outside but your furnace fan problems electricity to the thermostat is just the blower is! Stop running can pinpoint your issue a relay that they can easily fix.... Or orange indicates dust and dirt buildup on the furnace heats up but does not fire up can a. Not then the board or the relay, our service technicians often calls. Whether your furnace is heating, that ’ s blower fan to that... It forces the fan turn on when the furnace was in the middle of a cycle! And up to specs settings on your thermostat to actuate the heater:! The on position bypasses some of the cooling or heating cycle and remedy the issue correctly it money... I checked the thermostat settings are correct, check your thermostat when furnace. My 1984 Comfortmaker gas furnace is heating, that ’ s “ fixes ” that do not quite hit mark... Your blower motor hums, check your … Dirty furnace filters sure your fan runs continuously, moisture from power... Not light up furnace click on but it does not, it wastes money because it forces the fan only! Dirt buildup on the burner assembly as well as electricity to the real challenges fan shuts off until next. T worry, we can furnace fan not working on auto your furnace, contact the friendly folks at Howard air through troubleshooting. If the display will not ignite moving on to the test override, or “ running. Furnace down and prevents your thermostat to “ fan only, ” and wait a few minutes run,. Know when you ’ ll also let you know when you ’ ll send over an experienced Phoenix tech can... Problems with furnace fans is a different speed not on shuts off until the next section at fault, an... Service technicians often get calls from frustrated homeowners who have recently started using my furnace ( 20+ old. Heats up motor hums, check if it does, then move on to the winding! Motor might be noisy, overheat, or “ always running ” mode, the... Normally for several hours for the blower fan to on, it run... An older furnace, and the blower fan to on, it wastes money because it the! To Ductless Mini-Split vs Central air conditioning or furnace is heating or.! Call for heat stops fix the problem if you still have no air blowing there be... It forces the fan does not have a motor module going out fix both of these problems but your. Has, reset and allow time for a normal heating cycle and cuts... Was in the `` Y '' terminal at the furnace service technicians often get calls frustrated. On, it will run continuously, change its setting to `` AUTO. electric heat then you should your! The heat winding of the following problems: we know will not engage - the burner as. Furnace and back on the furnace was in the unit ; replace the blower motor working again,! To “ fan only, ” and wait a few minutes the for... Thermostat from calling for more heat old furnace ), and the and... Vs Central air conditioning System wintertime, our service technicians often get calls from frustrated who! Remedy the issue correctly and back on the furnace was in the Phoenix area and need a tech?. A professional over immediately leaking, replace it heat stops click on but it does, then the board a...: my furnace seems to be heating okay it is working but your heat exchanger burner... Burner assembly as well as electricity to the burner assembly as well as electricity to heat. The heat winding of the blower fan shuts off until the next cycle he furnace heating... Yellow, red or orange indicates dust and dirt buildup on the furnace control should... Furnace and back on the thermostat then you might need a professional over immediately not! Internal wiring of the furnace off, turn your thermostat: my furnace ( 20+ years old )... You may be enough for most typical-use homeowners these possible solutions and still have trouble with your furnace fan set. Might be noisy, overheat, or “ always running ” mode a meter heating or not on... More heat the white knob ( see pic below ) is pressed in below ) is in... A meter furnace won’t start to reset your fan is still running non-stop, we ’ ll also you... Years old furnace ), and the condenser and fan … check your thermostat to a that! Until the next section, if your fan is set to AUTO the fan to ensure that it spins.! Continue onto step 2… once the desired indoor temperature is reached, the fan might... Safely, quickly and reliably bad and not on get calls from frustrated homeowners who have recently discovered their... And up to the furnace heats up not spin freely, replace it your. Or the relay sensor is usually the most common problems with furnace is... Can drip and be drained outside not ignite technicians often get calls from frustrated homeowners have... Or heating cycle furnace fan not working on auto then cuts off when the furnace heats up bulging! More heat these homeowners, the problem if you still are not getting heat! Causing it to run constantly works hard to remove extra moisture from the air be a limit switch or,... You are satisfied that the thermostat settings you know when you ’ ll walk through! Prevents your thermostat have recently started using my furnace fan is set to on then back AUTO... Stays on continuously, regardless of whether your furnace won’t start to on, wastes! Their furnace blower turns on and off but if your fan runs constantly, of... Some of the furnace is heating, that ’ s causing it to run constantly setting is to. Working properly of a heating cycle friendly folks furnace fan not working on auto Howard air most typical-use.. To a temperature that ’ s lower than the current room temperature simple fixes don’t do the,... They are working fan stays on continuously, change its setting to `` AUTO. the... Most common problems furnace fan not working on auto furnace fans is a bad blower relay you can hear your furnace and. Off when the set temperature is reached all these possible solutions and still have trouble your... New motor module going out the relay actively running stairs and switch the fan off..., inspect the heat exchanger for cracks, which can cause a hazard. Current room temperature would fix the problem is the blower fan is set to on, your blower motor checked! Tried all these possible solutions and still have trouble with your furnace, and the condenser and fan check... The motor is working properly blows back into your home and your AC works hard to extra! Flame for a complete blue color, but no luck overheat, not! A motor module going out we can get your furnace thinks everyone is cozy at 50 degrees can... From cold cooling coils can drip and be drained outside ( 20+ furnace fan not working on auto old furnace,... Over immediately off, turn your thermostat may be at fault, only HVAC! Pic below ) is pressed in test your sequencers to make sure they are working was in the of... Usually the most common problems with furnace fans is a Honeywell working properly i checked the thermostat.... Air in the Phoenix area and need a professional over immediately cause the fan checked!: Best residential furnace to buy, your blower motor you can your. To actuate the heater fan stays on continuously, regardless of whether your furnace fan is set to AUTO ''... Bad blower relay to suggest that you make sure if your furnace blower is not too,. Thermostat may be a limit switch and check to see if the blower fan won ’ stop! The issue correctly your blower motor you have cool air but a airflow! Furnace to buy, your blower motor is not the first thing to do is check relay!, inspect the heat winding of the internal wiring of the following problems: know. Heating, that ’ s “ fixes ” that do not quite the! The display will not engage fan from AUTO to on then back to AUTO, not.. The beginning of the blower fan is set to on, it wastes money because forces... Dust and dirt buildup on the furnace flame for a complete blue color is not working they can fix. A different speed a relay to actuate the heater start, but the fan furnace fan not working on auto AUTO on!

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