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. You might need a new motor module on ECM motors. Internal wiring may replace the green wire if the thermostat does not give you the option of fan only or continuous fan. 4. I have read the different posting and replys, but they don't seem to address my problem. If the fan motor does not start, the furnace will overheat and the high-temperature limit switch should cause the burners to shut-off. Went outside and the condenser and fan … 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 experience in fixing a homeowner’s “fixes” … I have ensured that the fan is set to "auto", on the thermostat. How to Add Home Equity Through HVAC Upgrades. If your furnace fan is still blowing, continue onto step 2… 2. If there is a battery, check if it is working properly. While we’re always happy to help these homeowners, the problem is often something that they can easily fix themselves. The fan on position bypasses some of the internal wiring of the furnace. 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. 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. 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. Your email address will not be published. Digital or programmable thermostats may need the blue wire connected to them. See also: Best residential furnace to buy, Your email address will not be published. Adjust the setting to "Fan" or "Auto." Your fan limit switch is located directly under your furnace hood and controls when your furnace blower turns on and off. This morning it did not start. Required Part. Now put your furnace’s blower fan to the test. When I turn the power off to the furnace and back on the I replaced the thermostat thinking that would fix the problem, but no luck. 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. 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. Inspect the heat exchanger for cracks, which can cause a safety hazard. One diagnostic step that can be taken is to put the Fan switch to the “On” position at the thermostat. You need to trace the circuit from the ''Y'' terminal at the furnace to the blower. The unit ran fine for a few days. If you are satisfied that the thermostat settings are correct, check your … If you are lucky, there will be a schematic inside the furnace. Batteries (optional) Tip. All too often, restoring the flow of warm air is simply a matter of opening … We’ve provided pros and cons of each setting option, so you can decide which one is best for you. Start simple and work your way up to the real challenges. If it has, reset and allow time for a normal heating cycle. 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. 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. ON means that the fan is constantly on and blowing air when your HVAC system is not heating or cooling air. 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 I can manually turn the blower on high, but the lower speed does not work at all when set to auto. When you select "On," the fan stays on even when the heat is off. The problem is the blower only comes on if I put the "Thermostat Fan Switch" in the "On" 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. After a short time, the furnace shuts down so it does not overheat. We can get your furnace blower motor working again safely, quickly and reliably. Time to call in the experts! I do know it is not … We'll have a list of frequent causes and any replacement parts you may need. This sounds like your motor might be over-heating. 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. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not trip). 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 I have replaced the Limit Switch. When we... :confused: I finally programmed my sprinkler system correctly and it worked yesterday afternoon - went through all six zones with no problem. The auto setting turns the fan on only when the air conditioning or furnace is actively running. Circuit Breaker is Tripped. 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. The 5 Most Common Causes  May 12, ... and the system switch is on the AUTO or HEAT position. I would like to suggest that you make sure if your motor has a capacitor that the capacitor is good and up to specs. From the thermostat there will be white wire to the gas valve, yellow to the A/C, and green to the fan. Check to see if furnace circuit breaker has tripped. Most thermostats and furnaces have the contacts labeled R, B or C, W, Y, and G for the corresponding wire colors. We have relatively new house. One of the most common problems with furnace fans is a bad blower relay. (no flame senser). 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. 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