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