Furnace Draft Inducer Blower Noise

The blower wheel is attached to the blower motor shaft with a set screw.

Furnace draft inducer blower noise.

During the start up phase the inducer motor begins to run thus clearing the heat exchanger of any gas left over from the previous run cycle. Unfortunately you might be encountering one of them right now. Once the vent is moved through the pressure switch the system comes on and starts heating. A draft inducer or vent blower is the most common problem on a gas furnace or boiler to cause a noticeable noise.

If you find yourself hearing a strange noise from the furnace inducer motor we just might have the solution. The inducer motor blower assembly performs a variety of essential functions as part of a gas powered furnace. The blower wheel blows air out of the furnace and through the house. The assembly begins to operate during the initial start up phase of the furnace as part of a system of checks and balances that ensures a gas furnace is ready for operation.

For instance if the blower motor has worn out you will most likely hear it tapping or whizzing at higher frequencies and at louder volumes. This could be a tapping noise or a humming or whirring sound. If you hear noises coming from your draft inducer blower it likely needs total replacement. If the set screw is loose the blower wheel will wobble on the motor shaft and the wheel will be noisy as it turns.

Next inspect the wheel for damage. A failing inducer motor may create a noise shortly after a heating cycle begins. If the unit will turn on but the blower motor is not turning on there are a couple of ways to check if the draft inducer motor has gone bad. It s the first sequence of events upon a call for heat and it runs through most of the heating cycle.

The noises you re hearing are usually caused by one of two things. Furnace draft inducer blowers push air and gases out of your furnace and towards outside improving the quality of the air that moves through your furnace. Check the set screw to ensure that it is properly tightened. Specific problems can arise with a furnace draft inducer.

This video provides general information on how a furnace draft inducer fan motor works how to test the part where it is commonly located and general insta. Your furnace may also give you fault codes related to draft inducer blowers.