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