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How to Test a Fan Motor with a Multimeter

These days, it seems like there is a new type of fan motor being released every day. So if you want to know how your old-school single-phase or dual-phase fans work, this guide will help. We’re going to test them with an easy method using just a few cheap tools from Home Depot that anyone can buy – no complicated machinery required (though I recommend getting some if possible).In this blog post we will discuss how to test a fan motor with a multimeter.

When you want to know if your motor has a problem, first set up the multimeter and find out which wire is connected. If it has an endless reading of 0, then we could have some cable issues on our hands.
Testing fan motors is often a confusing process for those with little knowledge. This guide will make it simple, regardless of your level of experience in testing them.

Main Cause of Fan Motor Problems

A faulty run capacitor is the most common cause of fan motors breaking down. Before you start testing, always physically inspect the capacitors and look for any defects or damage that needs replacing right away. If found, things like dents in them must be fixed immediately because minor problems can lead wholeheartedly to significant issues with your entire machine.

How to Test a Fan Motor with a Multimeter

1. Wire Arrangement

The wiring configuration for your particular application is determined by various factors, including the voltage of power being delivered to it and its intended use.
You must know how much current will flow through each wire to determine which ones may be safely used without creating a fire hazard or shock risk – just like with any other appliance! In this lesson, we’ll go over everything needed so all potential dangers can easily be avoided beforehand.
The brown and white cables connected to the capacitor will be put through their paces based on their function. The black wire is for power, while red or yellow would indicate control signals that tell your fan what speed you want it to run at (included below).

2. Continuity Test

To test the continuity of your motor’s winding, use a digital multimeter (U-V or V – W) to ensure that there are no shorts in any phase. The result should register low but not zero ohms when tested across three phases; if it does, something may have happened at either installation time/chemical exposure during manufacturing which could lead to burned motors.

3. Power Supply Test

Testing the components of an electric motor may rapidly become intricate, and it’s simple to make mistakes if you are inexperienced. To ensure that your supply voltage will not cause damage or destruction in this process, take care when selecting what level is required for testing with a multimeter as well as how long each cable should be depending upon their purpose- some might need shorter amounts than others. Hence, there’s no chance they’ll get fried during operation.

4. Wired Test

The first set of wires test

White wires are the most common type of wire in an electric circuit. They’re used for power distribution, including running signals and alarms between different parts or rooms on a building’s surface.”

● The multimeter should be set to read Ohms.

● Touch the black multimeter test lead with white wire.

● Put the red multimeter probe on white-brown wire and touch it for about 10 seconds.

● When measuring your wires’ resistance, ensure they are below 1-2 ohms.

● However, to be visible, you should set the white-brown wire to one side of your numbers.

The second set of wires test

The brown wire is the start signal, while black provides a standard for all other wires to follow.

● Join the brown wire’s negative (black) multimeter probe with your device to get started.

● The red probe should be placed on the white cable.

● The normal range for resistance is between 32 and 40 ohms.

The third set of wires test

● To get a clear signal, remove the red lead from the white wire while leaving the black multimeter attached to the brown.

● Now, carefully place the red probe on top of one wire in this arrangement.

Values of fifteen ohms are ideal during this step of testing.

Fourth set of wires test

● Make sure you maintain the red test lead on your black wire while removing both white probes.

● Make sure you connect the black probe to a white wire and test your connections.

● To get an accurate reading, you must perform this test without the moving blade.

● The multimeter should read at least 20 ohms.

The best way to ensure an accurate reading is by using a digital scale that has been specially designed for this specific task. With its help, you can quickly and easily get the measurements needed without having any concerns about safety or other problems associated with doing so otherwise.

How to Test a Fan Motor with a Multimeter


South-wire clips are a great way to keep your readings accurate when working with fan motors. The variety of wires can be confusing, but using these handy devices will make sure you don’t get any mixed up north or south poles. Here’s how they work: wrap rubber around the string that has “south” written on it in order, so there is no confusion about which side goes where during use; then attach them both at right angles near an electrical outlet source before starting up appliances such as refrigerators (or other sources).
● The white wire is called the run line, which supplies power from your source. The brown cord starts this process by starting up an engine-the black standard cable will allow you signals as they travel through different areas of property or installation sites before reaching their destination.
● The setup process for your new ceiling fan might be different than what you are used to, but don’t worry. The manual will guide all of the steps.
● The fan motor’s metallic plate is the key to finding your replacement. It will show you what type of device it came from, how much power they produce (and if this particular part can handle it), as well as any other critical information about voltage or current requirements for installation in different countries around the world.

Ch Ashraf
With over 25 years of electrical contracting experience in the Gilawala area, Ashraf Electric provides reliable and efficient residential, commercial, and light industrial electrical services. As a locally owned company based in Lodhran, we specialize in quickly diagnosing and resolving electrical issues both big and small. Our team of highly skilled electricians is available 24/7 to ensure your electrical systems continue running safely. Whether you require a full rewiring, socket and switch upgrades, safety inspections, or lightning protection systems, contact Ashraf Electric for exceptional customer service and quality electrical workmanship.