How Do You Change a Sail Switch on a Suburban Furnace?

If your Suburban Furnace is not turning on or off when it should, the problem could be with the sail switch. The sail switch is a small device that senses the airflow in your furnace and tells it when to turn on and off.

If this switch is faulty or damaged, it can cause your furnace to malfunction. In this tutorial, we will show you how to change a sail switch on a Suburban Furnace.

Step 1: Turn Off the Power

Before you start working on your furnace, make sure that the power source is turned off. This will prevent any accidents or injuries while you are working. Locate the power switch or circuit breaker that supplies power to your furnace and turn it off.

Step 2: Remove the Furnace Cover

Using a screwdriver, remove the screws that hold the cover of your Suburban Furnace in place. Once you have removed all of the screws, carefully lift off the cover and set it aside.

Step 3: Locate the Sail Switch

The sail switch should be located near the blower motor of your furnace. It will be connected to a small metal arm with a sail-like piece attached to it. Carefully inspect this device to see if there are any signs of damage or wear.

Step 4: Remove the Sail Switch

Once you have located the sail switch, use a pair of pliers to disconnect any wires that are attached to it. You should also remove any screws holding it in place.

Step 5: Install The New Sail Switch

Install your new sail switch by reversing these steps. Connect any wires and tighten any screws needed for proper installation.


Make sure that you purchase an exact replacement for your old sail switch so that it fits perfectly into place.

Step 6: Test the Furnace

After you have installed the new sail switch, replace the furnace cover and turn on the power to your furnace. Test the furnace to see if it is working properly. If it is still not working correctly, you may need to call a professional for further assistance.


Changing a sail switch on a Suburban Furnace is a simple process that can be done with a few basic tools. By following these steps, you can ensure that your furnace is working correctly and efficiently. Remember to always turn off the power before working on any electrical components of your furnace.

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Emma Gibson