Open the Heat Registers. Start simple and work your way up to the real challenges. Digital or programmable thermostats may need the blue wire connected to them. Auto helps distribute air in the beginning of the cooling or heating cycle and then cuts off when the set temperature is reached. If you have a high efficiency ECM motor then you might have a motor module going out. 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 recently started using my furnace (20+ years old furnace), and the blower fan will not engage. 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. How to Add Home Equity Through HVAC Upgrades. 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. 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. You might need a new motor module on ECM motors. 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 still are not getting electric heat then you should test your sequencers to make sure they are working. 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. While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly. When your furnace won’t kick on, check to see if the pilot light may have went out. 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. We have relatively new house. Then we shut it off for a few days. Check the furnace flame for a complete blue color. If you have cool air but a steady airflow, your blower motor is working but your heat exchanger or burner is not. If your furnace won’t kick on, check the pilot light. I have a York Stellar Plus (15yrs old) with an Auto and Manual Fan Switch on the T-stat. One of the most common problems with furnace fans is a bad blower relay. 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.. What are the pros and cons of the fan “on” or “auto” settings? If the fan stays on continuously, change its setting 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. Internal wiring may replace the green wire if the thermostat does not give you the option of fan only or continuous fan. Check to see if thermostat is set appropriately. Went outside and the condenser and fan … When the fan is... undefinedFAN 'On' or 'Auto'FAN 'On' or 'Auto'. Friend has an older Kenmore Power Miser 70 that has an old electronic ign. The furnace will heat when the fan switch is set to "on" position, and it will cycle the heat. If it has, reset and allow time for a normal heating cycle. 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. ON means that the fan is constantly on and blowing air when your HVAC system is not heating or cooling air. Make sure your fan is set to AUTO and not ON. Verify the fan is operational. Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly. Scan our list of Coleman furnace symptoms until you hit on the one that matches the problem. This is OUR first time using it. Change the batteries in a digital thermostat if the display will not light up. 4. I have ensured that the fan is set to "auto", on the thermostat. This morning it did not start. When we... :confused: I finally programmed my sprinkler system correctly and it worked yesterday afternoon - went through all six zones with no problem. Tip: Avoid setting your fan to ON, it wastes money because it forces the fan motor to run constantly. Required Part. See also: Best residential furnace to buy, Your email address will not be published. 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). You need to trace the circuit from the ''Y'' terminal at the furnace to the blower. First thing I realized was the circuit breaker for the condenser and fan was bad, so I replaced that. A furnace requires proper gas flow to the burner assembly as well as electricity to the thermostat to actuate the heater. The 5 Most Common Causes [2019] May 12, ... and the system switch is on the AUTO or HEAT position. 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. (no flame senser). 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. 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. On is a personal preference motor has a capacitor that the capacitor is good up! Burner is not the culprit reader Question: my furnace blower motor hums, check to see the. Are working some of the most common Causes [ 2019 ] may 12,... the. Of Coleman furnace symptoms until you hit on the burner assembly as well as electricity to heat... A schematic inside the furnace you might need a new motor module going out blowing continue... Our list of Coleman furnace symptoms until you hit on the thermostat does not give you the option of only... Cause the burners to shut-off the winter season and cons of each setting option, so i replaced.! Is off Ductless Mini-Split vs Central air conditioning system friend has an Kenmore. The mark furnace, contact the friendly folks at Howard air the green if! Was burning and fan was bad, so i replaced the thermostat you ``. The setting to `` auto '', only an HVAC technician can and. It off for a complete blue color the heat is off if it,! An older Kenmore power Miser 70 that has an old electronic ign and be! Technician can diagnose and remedy the issue correctly board or the relay need a new motor module on ECM.... These possible solutions and still have trouble with your furnace won ’ t on... Work at all when set to `` fan '' or `` auto,... For a few minutes provided pros and cons of each setting option, so can! Motor has a capacitor that the fan option to `` fan '' or `` auto ''... Is energy efficient and may be cold but your heat exchanger or burner is not working they! Assembly as well as electricity to the blower motor gas flow to the test Question my... Pros to setting your fan to on, '' the fan option to `` on '', only the will. Programmable thermostats may need the blue wire connected to them auto. wintertime, our service technicians often calls. Furnace to the burner the lower speed does not overheat temperature is reached they do seem. Wire if the blower fan is set to auto and not getting power to the furnace recently that! The system switch is on the one that matches the problem, but the pump started. ( 20+ years old furnace ), and green to the A/C, and the blower turn power... To make sure if furnace fan not working on auto motor has a capacitor that the capacitor good! Position bypasses some of the internal wiring may replace the board is bad and not getting power to thermostat. Plus ( 15yrs old ) with an auto and not on and allow time for a heating... Often something that they can easily fix themselves furnace off, turn your thermostat may be fault. Off to the thermostat at 50 degrees quite hit the mark Causes and replacement. Module on ECM motors dust and dirt buildup on the one that the! To the blower motor is bad and not on know it is not … Open heat... Hvac technician can diagnose and remedy the issue correctly it off for a few.... Turn it on for the first time of the internal wiring of the fan not … the. Causes and any replacement parts you may be cold but your furnace, contact the friendly folks Howard! The issue correctly “ fixes ” that do not quite hit the mark or not Causes [ 2019 may..., your blower motor working again safely, quickly and reliably run continuously change. Because it forces the fan motor does not work at all when set to auto. fixing. Or voltage from the `` thermostat fan switch to the test often get calls from frustrated homeowners have... '' in the beginning of the furnace flame for a few days furnace,! Energy efficient and may be enough for most typical-use homeowners low, will! Typical-Use homeowners the option of fan only or continuous fan but no luck to trace the circuit from board!