HeatingWhy Isn’t My Fan Blower Working?

Every furnace has a large fan, called a blower fan, that helps distribute the warm air to your living spaces. When problems arise with this fan, you can experience a significant decrease in heating, or no heat at all. There are several components that allow the blower fan to operate correctly, making fan repairs somewhat complex to diagnose. This is why it’s important to make an appointment with your G&S Heating, Cooling & Electrical, Inc., technician when you experience an issue with your blower fan, or have other heating repair needs in Monroe.

Common Blower Fan Problems

Here are some of the more common problems our technicians see with furnace blower fans:

Worn/Broken Fan Belt

The fan belt is the component that helps the blower to rotate. Fan belts wear down with normal use; as such, they can crack, stretch and break. In order to help the fan rotate properly, the fan belt has to have a certain amount of tension; if the belt starts to stretch, some of this tension is lost, resulting in slower rotation. Cracks in the belt can cause the belt to snap, resulting in a total loss of rotation. If a bad fan belt is the issue, replacing the belt will restore the fan’s operation.

Bad Capacitors

The blower fan in your system uses two components called capacitors. One is a start capacitor, one is a run capacitor. The start capacitor stores energy to give the motor the electrical boost it needs to start; the run capacitor makes sure the motor receives a steady, even flow of electricity while it operates. If either of these capacitors malfunctions or fails, the operation of the blower will be affected.

Bad Limit Switch

Every furnace blower has a switch on it that senses when the air in the heat exchanger is hot enough to distribute. This switch is a limit switch, and it also functions as a safety mechanism: it will turn off the burner if the warm air becomes too hot. Sometimes this switch can fail, causing problems with the blower fan.

While it can be tempting to try and find out what is happening with a faulty blower fan – especially if you have no heat – it is a job best left to a trained professional. If you experience an issue with your furnace’s blower fan, call G&S Heating, Cooling & Electrical, Inc., and schedule your heating repair in Monroe.


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