How to Test Dryer Moisture Sensor with Multimeter

In the realm of modern laundry appliances, the moisture sensor within a dryer stands as a crucial component for efficient and effective drying cycles. However, like any electronic part, these sensors can experience wear or malfunction over time, leading to suboptimal drying performance. Enter the multimeter, a versatile tool that can aid in diagnosing and resolving issues with dryer moisture sensors.

How to Test Dryer Moisture Sensor with Multimeter

By harnessing its measurement capabilities, individuals can evaluate the sensor’s functionality and accuracy, ensuring clothes are dried to perfection while minimizing energy consumption. In this comprehensive guide, we explore the systematic process of how to test dryer moisture sensor with multimeter.

From comprehending the sensor’s operational principles to connecting the multimeter and deciphering the readings, this article empowers users with the skills necessary to maintain optimal dryer performance, streamline laundry routines, and achieve energy-efficient results.

The Importance of a Moisture Sensor in Dryers

A moisture sensor is critical for the functioning of a dryer. This device helps to regulate the temperature and humidity inside your dryer, which impacts how well it dries your clothes. Without it, clothes can come out either too wet or too dry. By testing your moisture sensor with a multimeter, you can ensure that it’s in working order and that your dryer is doing its job correctly.

To test the moisture sensor, you’ll need a multimeter and an insulated wire with alligator clips attached. If you don’t have one of these wires, they’re readily available in many hardware stores. Before attempting to test the moisture sensor, be sure to disconnect any power sources first and then place your multimeter into the ‘resistance’ setting.

Next, attach one of the alligator clips to the positive terminal of your multimeter and then touch the other clip to each side of a wire attached to your moisture sensor. The reading should be between 10,000 ohms and 200,000 ohms—if it’s outside this range, then it’s likely your moisture sensor is faulty and needs to be replaced.

It’s also important to check for any signs of physical damage, such as broken wires or corrosion. If you notice anything out of the ordinary, consult a professional technician before continuing with the test.

Each Side of a Wire Attached to Your Moisture Sensor

Finally, remember that because the multimeter can only measure resistance levels and not moisture, it’s not a foolproof method for detecting malfunctions—it will just let you know when the sensor is likely faulty. If you need to be sure that your dryer is in good working order, then it’s best to consult a professional technician.

Purpose of Testing Moisture Sensors to Ensure Efficient Drying and Prevent Damage

Testing moisture sensors with a multimeter is an important step for ensuring efficient drying and preventing damage to both clothing and the dryer itself. Moisture sensors are designed to detect when clothes are dry, allowing them to shut off at the optimal level of dampness. Without correctly functioning sensors, a dryer may either shut off too soon or continue running long after the clothes are dry, leading to increased energy costs and damage.

By using a multimeter, you can easily test the accuracy of your dryer’s moisture sensors and determine if they need to be replaced or adjusted. To do this, first unplug the dryer from its power source and remove the back panel of the machine to access the moisture sensors. With the multimeter, you can then measure how much voltage each sensor is receiving. If any of them are not within the recommended range, they need to be adjusted or replaced.

Testing moisture sensors regularly helps to ensure efficient drying and prevent unnecessary damage. This simple task should only take a few minutes and can help prolong the life of your dryer while saving money on energy costs. Ensure that your dryer is running at peak efficiency by testing the moisture sensors every few months. With proper maintenance and regular testing, you can rest assured that your clothes will always come out perfectly dry.

If you have any questions or concerns about how to test your dryer’s moisture sensors with a multimeter, it’s best to consult the manufacturer’s instructions as each machine may have slightly different procedures. Doing so will help ensure that your dryer is running at its most efficient and protect it from any unnecessary damage.

13 Methods How to Test Dryer Moisture Sensor with Multimeter

Method 1: Safety Precautions

Begin by prioritizing safety. Ensure that the dryer is completely disconnected from its power source to avoid electrical hazards during the testing process. Create a safe workspace by clearing the area around the dryer and ensuring proper lighting. Wear appropriate personal protective equipment, including safety glasses and insulated gloves, to safeguard yourself from potential risks.

Method 2: Gather Required Tools

Collect the necessary tools and materials before you begin. You’ll need a digital multimeter capable of measuring resistance and continuity. Make sure the multimeter is in good working condition and its batteries are charged. Additionally, have the manufacturer’s manual for your specific dryer model on hand, as it will provide essential information and guidelines.

Method 3: Understand Moisture Sensor Functionality

Before testing, take some time to familiarize yourself with how the moisture sensor operates within your particular dryer model. Different dryers may have variations in sensor design and connections. Consult the manufacturer’s documentation, including the manual or online resources, to gain insights into the sensor’s operational principles.

Method 4: Locate the Moisture Sensor

Identify the precise location of the moisture sensor within the dryer drum. Generally, the moisture sensor consists of metal bars or strips that come into contact with the clothing during the drying cycle. The manufacturer’s manual should have detailed diagrams or descriptions to help you locate the sensor accurately.

Method 5: Disconnect Power

Safety remains paramount throughout the testing process. Ensure that the dryer is unplugged from the electrical outlet or disconnected from its power source. This precaution prevents accidental activation of the dryer during the testing, eliminating the risk of electrical shock.

Method 6: Access the Moisture Sensor

Depending on the design of your dryer, you may need to access the moisture sensor by removing the dryer drum or front panel. Refer to the manufacturer’s manual for specific instructions tailored to your dryer model. Follow the outlined steps meticulously to prevent any damage during disassembly and reassembly.

Method 7: Set Up Multimeter

Configure your multimeter for the appropriate measurement mode. Since you’ll be measuring resistance and continuity, select the corresponding setting on the multimeter’s dial. Ensure that the dryer’s timer and any cycle settings are turned off to avoid interference during the testing process.

Configure Your Multimeter for the Appropriate Measurement

Method 8: Test for Continuity

With the multimeter set up, gently touch one multimeter probe to each of the moisture sensor’s metal bars or strips. It’s essential to ensure that the probes make solid contact with the metal surfaces. If the multimeter displays a reading close to zero ohms, this signifies continuity, indicating that the moisture sensor is functioning correctly.

Method 9: Check for Fluctuations

To further assess the sensor’s responsiveness, introduce moisture by gently touching the sensor bars with a damp cloth or wet sponge. Observe the multimeter readings closely as they may fluctuate due to the change in moisture levels. This test confirms that the sensor can effectively detect varying degrees of moisture.

Method 10: Interpret the Readings

Compare the readings displayed on the multimeter with the manufacturer’s specifications for the moisture sensor’s resistance values. These specifications can typically be found in the manufacturer’s manual. If the readings significantly deviate from the specified range or if the sensor doesn’t exhibit any change when exposed to moisture, it suggests a potential malfunction, and the sensor may need replacement.

Method 11: Clean the Sensor Bars

If the readings appear inconsistent or the sensor doesn’t respond as expected, it’s possible that the sensor bars are dirty or coated with residue. Carefully clean the metal bars using a soft cloth dampened with mild detergent. Avoid using abrasive materials that could damage the sensor. After cleaning, repeat the continuity test to see if the cleaning improved sensor performance.

Method 12: Reassemble and Retest

After cleaning or making any necessary repairs, reassemble the dryer following the manufacturer’s instructions. Once the dryer is put back together, repeat the moisture sensor test to ensure that its functionality has been restored. This step verifies that the repairs or cleaning have effectively resolved any detected issues.

Method 13: Consult Professional Help

If you encounter persistent or complex issues during the testing process or if the moisture sensor appears to be functioning correctly but the drying performance remains subpar, it’s advisable to seek professional assistance. A qualified technician can conduct further diagnostics, utilize specialized equipment, and address any underlying problems that may not be evident during a basic multimeter test.

A Qualified Technician Can Conduct Further Diagnostics


In conclusion, testing a dryer moisture sensor requires a multimeter and some know-how. It is important to first consult your user manual or look up steps online as each machine may have different instructions. Do not attempt to open the dryer without disconnecting it from any power sources, as doing so can cause personal injury or property damage due to electric shock.

After testing the device, either fix the issue on your own if you feel comfortable enough or reach out for professional help if not. If you follow this guide closely, then you should be able to successfully test your dryer moisture sensor with a multimeter and any issues will be fixed in no time. Now that you know how to Test Dryer Moisture Sensor with Multimeter, go ahead and get started on checking yours today!

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Enrique Howard

Hi, I am Enrique. I started my professional life as a handyman and did a lot of external and internal repair of home and office with a little bit of electric and plumbing support. I have extensive experience in tools testing such as drilling, turning, milling, and non-conventional machining like EDM. So let me help you on your journey towards becoming an enlightened DIYer with amazing tools that you can use on your project.

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