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How To Test Blower Motor With Multimeter

When your furnace or air conditioning unit starts making strange noises, there’s a good chance that the blower motor is to blame. This important piece of equipment helps to circulate air throughout your home, and if it’s not working properly, you may experience problems like high energy bills or overheating. In this article, we will explain how to test a blower motor with a multimeter. By following these simple steps, you can determine whether or not the motor is working properly and take necessary steps to fix the issue.

What is a multimeter and what does it do?

A multimeter is a tool that can be used to measure different electrical properties of an object. This can include checking the voltage, current, and resistance of an object. It is also commonly used to test for faults in electrical systems.

How to use a multimeter to test blower motors

If your blower motor is not working, it might be because of a bad circuit board. To test the circuit board, you will need a multimeter. First, turn off the power to the unit by unplugging it from the electrical outlet. Then use a voltmeter to measure the voltage at each plug in the circuit.
It is also possible that there is a bad connector on the motor itself. To test this, remove one of the screws that attaches the motor to the housing and use a small screwdriver to probe inside the hole where the motor wires come out. If you are able to move or change any of these electrical connections, then your motor is probably bad and needs to be replaced.

What are the common problems with blower motors and how can you fix them?

Blower motors can be a source of problems for a variety of reasons. In some cases, the motor may not be drawing enough power to run properly, or it may have failed due to overheating. In other cases, the wiring may be damaged or defective.

To test a blower motor, you will need a multimeter and some basic wiring knowledge. First, determine the voltage at the terminals of the motor (usually 12 or 24 volts). Then, connect the multimeter to one terminal and the power supply (wall outlet, car battery, etc.) to the other terminal. Make sure that the meter is set to measure volts (or amps if you are testing an AC motor) and turn on the power supply. Watch as the meter readings change according to how much power is being sent to the motor. If there is a problem with your blower motor, you will likely see high readings at one point and low readings later on when more power is being used.


If your blower motor doesn’t seem to be working as it should, you might want to test it for continuity using a multimeter. To do this, connect the black (negative) probe of the multimeter to one terminal of the blower motor and connect the red (positive) probe to another terminal. If the voltage between these two terminals is zero or there’s no power going through the motor, then your blower motor is probably not working properly and needs to be replaced.