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How To Replace Resistor On Blower Motor

When it comes to repairing electronics, one of the most common repairs is replacing resistors. Replacing resistors can be a quick and easy fix, but sometimes they can become fried or damaged. In this blog post, we will explore how to replace a resistor on a blower motor. By following these simple steps, you will be able to fix your blower motor in no time at all!

What is a resistor?

A resistor is a device that slows or stops the flow of current through it. It’s most commonly used in electrical circuits to reduce the amount of power needed to turn an electric motor, fan, or other device.

How to replace a resistor on a blower motor

If you find that your blower motor isn’t blowing as strong as it used to, or if the unit just won’t turn on at all, it may be time to replace the resistor. This small item is located near the electric motor and can usually be replaced without any special tools. Here’s how:

1. Remove the screws that hold the cover in place (one on either side) and then pull off the cover.

2. locate and remove the resistor. It looks like a metal disc with several smaller wires attached to it.

3. Replace the resistor with a new one and screw the cover back on. Reinstall any screws that were removed in step 1.

What are the risks of replacing a resistor on a blower motor?

Replacing a resistor on a blower motor can be dangerous and can void the motor’s warranty. Any time you are working with electric circuits, there is always the risk of electrocution. If the resistor fails, there is a high potential for current to flow through it and into your body. The resistor can also overheat and melt, thus causing an electrical fire. In addition, if you do not know what you are doing when replacing the resistor, you could damage the motor or even worse, cause an injury. Always be sure to have a qualified technician replace the resistor on your blower motor.

How to test if a resistor needs to be replaced

If you are experiencing a problem with your blower motor, it is likely that one or more resistors need to be replaced. Testing for resistor failures is simple and can be done using an ohmmeter. First, identify the resistor that needs to be tested. On most blowers, this will be the largest resistance (typically around 10-15k ohms) on the power lead between the motor and the battery. The other resistors on the circuit will typically have negligible resistance.

To test a resistor, connect the ohmmeter leads to the power lead and ground and measure the resistance between them. If the resistor is failing, it will have a high resistance value. To replace a resistor, remove it from its housing by gently prying off the retaining clips and then solder in a new part. Be sure to clean all of the old solder away before reassembly as this can cause problems with future connections.


If you’re having trouble with your blower motor not turning on, there is a possibility that the resistor has gone bad. Replacing the resistor is easy and can be done in just a few minutes. Here are the steps: