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How To Tell If Blower Motor Resistor Is Bad

Apparently, there is a “blower motor resistor” that can fail. And when it does, it can cause your blower motor to become inoperable. Obviously, this is not something you want to happen if you are trying to keep your home or office cool. Thankfully, there are ways to find and fix the problem before it becomes an issue. In this blog post, we will discuss the symptoms of a bad blower motor resistor and how to determine if it’s causing problems. We will also provide instructions on how to replace the resistor if needed.

What is a blower motor resistor?

A blower motor resistor (BMS) is a component in the electrical system of a typical household appliance that helps to regulate the voltage supplied to the fan motor. If the BMS becomes defective, it can cause a loss of power to the fan, which can lead to decreased air flow and overheating. In some cases, this may also result in a fire. If you’re experiencing problems with your household appliances, it’s important to check for and replace any BMSs that are found to be defective.

How do they work?

Blower motors are essential to the operation of most fans and air conditioners. An improperly functioning blower motor can cause a number of problems, including decreased airflow and even dangerous overheating.

To determine if your blower motor resistor is bad, first try checking the continuity of the wires using a voltmeter. If one or more of the wires has a low reading, then the resistor is likely bad and needs to be replaced. If all of the wires have good readings, however, it may still be necessary to replace the resistor if it’s showing signs of wear or deterioration.

Signs that a blower motor resistor is bad

If your car’s blower motor resistor starts blowing fuses, the resistor may be bad. If the resistor begins to produce a high-pitched squeal or hiss when the blower is turned on, it is likely that it is defective and needs to be replaced. When the resistor starts failing, it can cause sudden loss of power to the car’s engine, which can lead to a failure of other components in the system.

How to replace a blower motor resistor

If you have a model of air conditioner that uses a blower motor resistor, it is time to replace the resistor. A blown or malfunctioning blower motor resistor can cause your AC unit to work poorly or not at all. Here are four ways to tell if your blower motor resistor is bad: 1) Check the continuity of the resistance between the Nichia lighted end and the power supply. If there is no continuity, the resistor may be bad. 2) Use an ohmmeter to measure the resistance between each of the windings on the flywheel (assuming your AC unit has one). The resistance should be around 10k-15k ohms. If it’s much higher, or lower, then the resistor may be bad. 3) Look for signs of overheating such as melted wires, burnt insulation, or scorched components. Anything beyond normal wear and tear is likely due to a blown or malfunctioning resistor. 4) If step three fails to provide definitive proof that the resistor is bad, try replacing it even if step two shows no indication of trouble. A blown resistor will often result in poor performance and degraded cooling ability so correcting it as soon as possible is always best practice