How To Test A Fan Motor With A Multimeter

How To Test A Fan Motor With A Multimeter, <h1>How To Test A Fan Motor With A Multimeter</h1> <h2>Introduction</h2> <p>A fan motor is an, blog, how-to-test-a-fan-motor-with-a-multimeter, KampionLite

How To Test A Fan Motor With A Multimeter


A fan motor is an essential component in various devices and appliances such as air conditioners, refrigerators, and computer cooling systems. It is responsible for spinning the blades or impellers, which creates airflow to cool down the system. Over time, fan motors can wear out or malfunction, resulting in decreased performance or complete failure. To determine if the fan motor is the issue, you can test it using a multimeter. In this article, we will guide you through the process of testing a fan motor with a multimeter.

Items Needed

  1. Multimeter
  2. Safety gloves and goggles
  3. Owner’s manual for the device or appliance with the fan motor
  4. Screwdriver or other necessary tools to access the fan motor
  5. Replacement fan motor (optional)
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Step-By-Step Guide

Step 1: Safety Precautions

Before starting the testing process, it is important to prioritize safety. Wear safety gloves and goggles to protect yourself from any potential electrical hazards. Additionally, always refer to the owner’s manual for safety instructions specific to your device or appliance.

Step 2: Access the Fan Motor

Depending on the device or appliance you are working on, accessing the fan motor may require removing a cover or other components. Use a screwdriver or the necessary tools to gain access to the fan motor, ensuring that the device is unplugged or disconnected from the power source.

Step 3: Disconnect the Motor Wiring

Locate the wire connectors or terminal block connecting the fan motor to the power supply or control board. Carefully disconnect the wiring, ensuring that you remember or mark the wires for reconnection later.

Step 4: Set Multimeter to Ohms

Turn on the multimeter and set it to the resistance or ohms (Ω) function. This setting allows you to measure the electrical resistance of the fan motor.

Step 5: Test for Continuity

With the multimeter still on the resistance or ohms setting, hold the metal probes to the electrical terminals of the fan motor. One probe should be placed on each of the terminals. The multimeter will display a reading, indicating the resistance.

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If the multimeter shows a reading of infinite resistance or no continuity, it means there is an open circuit in the fan motor, and it may need to be replaced.

However, if the multimeter shows a reading other than infinite resistance or continuity, proceed to the next step.

Step 6: Test for Short Circuits

Short circuits can occur when there is a direct connection between two or more electrical terminals that should not be connected. To test for short circuits, keep the multimeter set to the resistance or ohms setting and touch one probe to the fan motor body or casing while touching the other probe to each of the electrical terminals one at a time.

If the multimeter shows a reading of zero resistance or continuity, it means there is a short circuit in the fan motor, and it should be replaced.

If the multimeter shows a reading other than zero resistance or no continuity, move on to the next step.

Step 7: Check for Proper Resistance

Refer to the owner’s manual or do some research to find the recommended resistance range for the fan motor you are testing. Touch one probe of the multimeter to one of the electrical terminals and the other probe to the remaining terminal.

If the multimeter shows a resistance reading within the recommended range, the fan motor is functioning properly. However, if the reading is significantly higher or lower than the recommended range, it may indicate a problem with the motor and further troubleshooting or replacement may be necessary.

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Step 8: Reconnect the Motor Wiring

If the fan motor passes all the previous tests, it is time to reconnect the motor wiring. Ensure that you reconnect the wires correctly according to the markings or notes you made earlier.

Step 9: Reassemble the Device or Appliance

Once the motor wiring is reconnected, carefully reassemble the device or appliance, making sure all fasteners and components are secure. Remember to follow the manufacturer’s instructions or consult the owner’s manual for proper reassembly.

Step 10: Test the Device or Appliance

After reassembly, reconnect the device or appliance to the power source and turn it on. Observe the operation of the fan motor for any abnormal noises, excessive vibrations, or inadequate airflow.

If the fan motor still exhibits issues after testing, it may require further troubleshooting or professional repair.


Testing a fan motor with a multimeter is a straightforward process that can help identify potential issues and determine if the motor is functioning properly. By following the step-by-step guide outlined in this article, you can confidently diagnose and address fan motor problems, increasing the efficiency and lifespan of your device or appliance.



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