furnace fan not working on auto

Any yellow, red or orange indicates dust and dirt buildup on the burner. Tip: Avoid setting your fan to ON, it wastes money because it forces the fan motor to run constantly. If there is a battery, check if it is working properly. Fan Speed Controller: The Fan Speed Controller controls the speed of the fans, increasing or decreasing the BTU output of the furnace. If your furnace fan is set to AUTO and is still running, then move on to the next section. There may be a limit switch or timer, plus a relay. 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. 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. But don’t worry, we’ll walk you through some troubleshooting steps so that you can pinpoint your issue. You need to trace the circuit from the ''Y'' terminal at the furnace to the blower. Well, if your furnace blower fan won’t stop running, you could have any of the following problems: We know. Comment document.getElementById("comment").setAttribute( "id", "a61f6ef03ece0412ececc9386c9d596e" );document.getElementById("bd173a6fd8").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. Check the settings on your thermostat before moving on to troubleshoot the air conditioner unit. Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. Furnace Won’t Turn On? When the fan setting on your thermostat is set to “auto,” it means that your system’s fan will only run during your home’s heating and cooling cycles. If you still are not getting electric heat then you should test your sequencers to make sure they are working. © 2020 Patrick Riley, LLC. … The pilot light or ignition sensor is usually the most common issue when your furnace will not ignite. Some older gas furnaces use a belt-drive blower motor. If the fan stays on continuously, change its setting to "Auto." If you see or hear the fan turn on, your blower motor is not the culprit. The fan on position bypasses some of the internal wiring of the furnace. If it does, then the motor is bad. Auto helps distribute air in the beginning of the cooling or heating cycle and then cuts off when the set temperature is reached. 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. The capacitor can also be checked with a meter. All Rights Reserved. Follow these troubleshooting steps to do that. 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. If the blower fan is unobstructed but does not spin freely, replace the blower motor. Is your furnace firing up but not blowing heat as hard as normal? Your fan limit switch is located directly under your furnace hood and controls when your furnace blower turns on and off. Make sure your fan is set to AUTO and not ON. Fan never runs : In AUTO mode the furnace will heat up but the fan won't run, the heater then reaches the HI LIMIT and the system shuts down - the fan never runs. If your fan runs continuously, moisture does not have a chance to drip outside. Bad Belt. Your email address will not be published. You tried all these possible solutions and still have no air blowing? That’s a lot of possible problems. 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. The auto setting turns the fan on only when the air conditioning or furnace is actively running. 4. This shuts the furnace down and prevents your thermostat from calling for more heat. It blows back into your home and your AC works hard to remove extra moisture from the air. Circuit Breaker is Tripped. The furnace is a York and the thermostat is a Honeywell. 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. Dirty air filters … Tip: Avoid setting your fan to ON, it wastes money because it forces the fan motor to run constantly. Pull the white button out to reset your fan limit switch to AUTO. If i go up stairs and switch the fan from auto to on then back to auto the fan works normally for several hours. If the blower starts by turning the thermostat fan switch to the "On" position, but does not come on automatically after the burners have ignited, this may indicate a faulty control board. Did your furnace fan stop blowing? It is an older furnace, and I have checked the thermostat settings. First off, let’s confirm that your thermostat is set correctly and isn’t calling for continuous heat or forcing the fan to blow non-stop. Dirty furnace filters. 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 the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not trip). If no voltage is recorded, you will have to replace the board or the relay. 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 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. This is a bad temperature sensor in the unit; replace the fan limit controller. Live in the Phoenix area and need a tech now? Required Part. 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. Set your thermostat to a temperature that’s lower than the current room temperature. 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. My furnace seems to be heating okay it is just the blower will not shut off. See also: Best residential furnace to buy, Your email address will not be published. You’ll need to replace your furnace filter more frequently. A furnace requires proper gas flow to the burner assembly as well as electricity to the thermostat to actuate the heater. 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). One of the most common problems with furnace fans is a bad blower relay. If your fan is set to ON, it will run continuously, regardless of whether your furnace is heating or not. Unfortunately, you’ll need a professional to fix both of these problems. If set too low, you may be cold but your furnace thinks everyone is cozy at 50 degrees. 1. Check to see if furnace circuit breaker has tripped. 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. The first thing to do is check the relay or voltage from the board. The furnace control board should start the blower motor within 1 minute after igniting the burners. A faulty or dirty ignition or sensor is a relatively easy fix, so follow these steps, and … While we’re always happy to help these homeowners, the problem is often something that they can easily fix themselves. If so, your switch is set to manual override, or “always running” mode. While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly. Time to call in the experts! 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. The one for the ON position is a different speed. When your fan is set to AUTO, moisture from cold cooling coils can drip and be drained outside. Outside was 91. 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. When your thermostat is set to AUTO, your furnace fan should blow only when your furnace is in the middle of a heating cycle. What Are the Different Types of Furnaces? The first thing you want to do if your furnace … Batteries (optional) Tip. I checked the T-stat and it was set correct. If your furnace fan is still running non-stop, we can help. Do this: Ensure your thermostat’s fan setting is set to AUTO, not ON. If the furnace was in the middle of a heating cycle, wait 3 to 4 minutes for the blower fan to stop running. If your furnace fan is set to AUTO and is still running, then move on to the next section. If it has, reset and allow time for a normal heating cycle.

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