Step-by-Step Guide: How to Test Moisture Sensor on Dryer with Multimeter

Ensuring your dryer operates effectively is crucial to avoid damp or over-dried clothes that can lead to damage and wear and tear. One vital component of your dryer that helps determine the optimal drying time is the moisture sensor. If you suspect that your dryer’s moisture sensor is malfunctioning, it’s important to test it to ensure it’s working correctly.

In this section, we’ll provide you with a comprehensive step-by-step guide on how to test the moisture sensor on your dryer with a multimeter. You’ll learn the process of accessing the sensor and interpreting the readings on your multimeter. This test can help you determine any issues with your dryer’s moisture sensor so that you can keep your clothes perfectly dry.

Key Takeaways:

  • Testing your dryer’s moisture sensor is essential for efficient and accurate drying.
  • Using a multimeter, you can diagnose and troubleshoot issues with your dryer’s moisture sensor.
  • Regular cleaning and maintenance of the sensor can help ensure optimal drying results.
  • Interpreting the multimeter readings accurately can help determine any issues with the moisture sensor.
  • Following safety precautions while working with your dryer and multimeter is crucial.

Understanding the Moisture Sensor on Your Dryer

Before we delve into the testing process, it’s important to have a basic understanding of how the moisture sensor works in your dryer. Most modern dryers come with a moisture sensor, which detects the moisture levels in your clothes and adjusts the drying time accordingly. The sensor ensures that your clothes are not over-dried or under-dried, which can cause damage to the fabric and reduce the lifespan of your clothes.

The moisture sensor works by sending a signal to the control board of the dryer, indicating the moisture level in the clothes. If the clothes are wet, the sensor will continue the drying cycle until the moisture levels drop to the desired level. If the clothes are already dry, the sensor will end the cycle, preventing over-drying and saving you money on your energy bills.

Dryers with moisture sensors also come with a timer, which allows you to set a specific dry time for your clothes. However, the moisture sensor takes priority over the timer, and the dryer will stop when the sensor detects that the clothes are dry, regardless of the remaining time on the timer.

The Importance of the Moisture Sensor

The moisture sensor is a crucial component of your dryer, as it ensures that your clothes are dried efficiently and effectively. Without a moisture sensor, your dryer would rely solely on the timer, which can result in over-drying or under-drying of your clothes. Over-drying can cause damage to the fabric and shrinkage, while under-drying can leave your clothes damp and smelly.

Furthermore, the moisture sensor helps to reduce energy consumption, as the dryer only operates as long as necessary to dry your clothes. This can save you money on your energy bills and reduce your carbon footprint, making it an environmentally friendly feature.

Gather the Necessary Tools and Safety Precautions

testing dryer moisture sensor with multimeter

Before testing the moisture sensor on your dryer using a multimeter, there are a few tools you’ll need to gather:

  • A multimeter (ideally one with a resistance mode).
  • A screwdriver or nut driver (depending on the type of screws holding the dryer’s back panel in place).
  • A safety mask (to prevent inhalation of dryer lint or dust).
  • Protective gloves (to avoid any accidental electrical shock).

Once you have these tools, it’s essential to take some safety precautions before proceeding:

  • Unplug the dryer from the power outlet to avoid any electrical shock.
  • Turn off the gas supply if your dryer is a gas dryer.
  • If you’re working on a gas dryer, take extra care not to damage the gas line or connections while accessing the moisture sensor.
  • Wear protective gloves and a mask to protect yourself from harmful substances and avoid inhaling dryer debris.
  • Place a protective cover or towel on the floor or work area to avoid any scratches or damage to the dryer.

By taking these necessary steps, you can protect yourself and your dryer during the testing process.

Accessing the Dryer’s Moisture Sensor

how to check moisture sensor on dryer using multimeter

Before you can test the moisture sensor on your dryer using a multimeter, you need to locate and access the sensor itself.

The exact location of the sensor can vary depending on the type and model of your dryer, so consult your owner’s manual or do a quick online search to find the specific location for your dryer.

In some dryers, the sensor is located near the lint filter, while in others, it may be found near the front or rear of the drum. Once you have identified the location of the sensor, you will need to follow these steps to access it:

  1. Unplug your dryer to ensure your safety while working on it.
  2. Remove the screws or other fasteners that are securing the back or front panel of the dryer, depending on the location of the sensor.
  3. Carefully remove the panel to expose the inner workings of your dryer.
  4. Locate the moisture sensor and carefully disconnect any wiring that is connected to it. Be sure to take note of which wires connect to which terminals to ensure proper reconnection later.

Once you have accessed the sensor, you are ready to begin testing its functionality with a multimeter. Refer to Section 5 for instructions on how to perform the test.

Testing the Moisture Sensor with a Multimeter

multimeter testing the dryer moisture sensor

Now that you have gathered all the necessary tools and taken the proper safety precautions, it’s time to test the moisture sensor on your dryer using a multimeter. Follow these simple steps:

  1. Remove the wires connected to the sensor. Some sensors may have a release tab while others may require gentle pulling to remove. Refer to your dryer’s manual for specific instructions.
  2. Set your multimeter to the resistance or ohms setting. Make sure the multimeter is turned on.
  3. Touch the probes of the multimeter to the metal contacts on the moisture sensor. Ensure that the probes are touching the metal and not the plastic base of the sensor.
  4. The multimeter should display a resistance reading between 0 and infinity. If the reading shows zero or low resistance, the sensor is functioning correctly. If the multimeter displays a high resistance or infinity reading, the sensor is faulty and needs to be replaced.
  5. Reconnect the wires to the sensor once the test is complete. Ensure that the connections are secure and tight.

It’s important to remember that the specific resistance range for your dryer’s moisture sensor may vary depending on the model and manufacturer. Refer to your dryer’s manual for the appropriate resistance range.

Interpreting the Multimeter Readings

dryer moisture sensor multimeter reading

After performing the multimeter test for your dryer’s moisture sensor, you’ll need to interpret the readings to determine if the sensor is functioning correctly. The multimeter measures the electrical resistance of the sensor and displays the values in ohms.

When testing the sensor, the multimeter should display a reading of 5000 ohms or higher. If the reading is lower than 5000 ohms, it indicates that the sensor is faulty and needs to be replaced.

It’s also important to note that the readings may vary slightly depending on the type and model of your dryer. Consult your dryer’s manual for the recommended ohm range for your specific model.

Reading Examples

5000 ohms or higherNormal
1000-4000 ohmsLow
0 ohmsFailed

If your multimeter displays a low or failed reading, it’s best to replace the moisture sensor to ensure accurate detection of moisture levels in your dryer. It’s important to note that a faulty sensor can result in longer drying times, increased energy consumption, and potentially damage to your dryer.

Troubleshooting the Moisture Sensor

troubleshooting dryer moisture sensor with multimeter

If you encounter any issues or abnormal readings during the test, don’t panic. Here are some troubleshooting tips to help you identify and fix common problems with the moisture sensor.

The Dryer Doesn’t Turn On

If your dryer doesn’t turn on, check the power source first. Ensure that the dryer is plugged in, and the circuit breaker is not tripped. If everything seems fine, but the dryer still doesn’t turn on, the moisture sensor might not be the issue. Call a professional technician to diagnose and fix the problem.

The Sensor Isn’t Detecting Moisture Levels

If the moisture sensor is not detecting the moisture levels in your clothes accurately, it might need cleaning. Dirt and lint can accumulate on the sensor and reduce its sensitivity. Consult your dryer’s manual to learn how to access and clean the sensor. If cleaning doesn’t solve the problem, the sensor might be faulty and needs replacement.

The Multimeter Readings Are Inconsistent

If the readings on your multimeter are inconsistent or fluctuating, it could be a sign of a loose connection. Check the connections between the moisture sensor and the control board and tighten them if necessary. If the connections seem fine, the moisture sensor might be damaged and needs replacement.

Remember, working with electrical appliances can be dangerous. Always disconnect your dryer from the power source before attempting any repairs or maintenance. If you’re not sure about something, it’s best to call a professional technician.

Maintenance Tips for Your Dryer’s Moisture Sensor

dryer moisture sensor test

Regular maintenance of your dryer’s moisture sensor can prolong its life, prevent malfunction, and ensure accurate drying results. Here are some essential maintenance tips:

Clean the Moisture Sensor

A dirty moisture sensor can cause inaccurate readings or prevent the dryer from functioning properly. Clean the sensor with a soft cloth or cotton swab and a mild detergent. Be gentle and avoid damaging the sensor’s surface.

You can also use rubbing alcohol to clean the sensor. Dampen a cloth or cotton swab with rubbing alcohol and gently clean the sensor’s surface. Avoid using harsh chemicals or abrasives that can damage the sensor.

Check for Damage

Check the moisture sensor for any signs of damage, such as cracks, dents, or scratches. These can affect the sensor’s accuracy and performance, leading to malfunction. If you notice any damage, replace the sensor immediately.

Inspect Electrical Connections

Inspect the electrical connections to the moisture sensor for any loose or damaged wires. Tighten any loose connections and replace any damaged wires to ensure proper functioning of the sensor.

Replace the Sensor

If you have tested the moisture sensor using a multimeter and found that it is not functioning correctly, then it may need to be replaced. Contact your dryer’s manufacturer or a professional for assistance with replacing the sensor.

By following these maintenance tips, you can maximize the performance and lifespan of your dryer’s moisture sensor, ensuring accurate and efficient drying every time. Don’t forget to test the sensor regularly using a multimeter to identify any issues and address them promptly.

Additional Considerations for Optimal Drying

While the moisture sensor is an essential component in achieving optimal drying results, there are other factors to consider. For dryers with moisture sensors, it’s important to ensure that the dryer is properly loaded to allow adequate airflow. Overloading the dryer or stuffing it with large items, such as comforters or blankets, can impede airflow and impact the drying process.

Additionally, consider the placement of your dryer. Placing the dryer in a well-ventilated area can also improve drying efficiency. If your dryer is located in a small, enclosed space, it may take longer to dry your clothes properly.

Regular maintenance is also critical in ensuring that your dryer operates at maximum efficiency. Clean the lint filter after each use to prevent the buildup of lint, which can clog the vent and slow down the drying process. You should also periodically clean the dryer drum and exhaust duct to remove any accumulated lint or debris.

Moreover, consider upgrading to a newer model that incorporates advanced technology for optimal drying efficiency. Look for dryers with features such as steam cycles, which can remove wrinkles and sanitize your clothes while reducing drying time.

Maintain Your Dryer’s Moisture Sensor for Optimal Drying Results

By considering these additional factors and implementing regular maintenance practices, you can ensure that your dryer’s moisture sensor operates at maximum efficiency. This will result in time and energy savings, as well as properly dried clothes every time.


Congratulations! You have successfully tested the moisture sensor on your dryer using a multimeter. By following the step-by-step guide and taking necessary safety precautions, you can diagnose any issues with the sensor and maintain its functionality for optimal drying results.

Remember to regularly maintain and clean the sensor to avoid any potential issues in the future. Additionally, consider other factors that can affect drying efficiency, such as load size and dryer venting, to maximize the performance of your dryer.

Additional Resources

For more information on maintaining and troubleshooting your dryer’s moisture sensor, consult the user manual or contact the manufacturer. Don’t hesitate to seek professional assistance if needed.

Thank you for reading our guide on how to test the moisture sensor on your dryer using a multimeter. We hope it has been informative and helpful in ensuring effective and accurate drying for your clothes.


How often should I test the moisture sensor on my dryer?

It’s recommended to test the moisture sensor on your dryer at least once a year to ensure optimal performance.

What if I don’t have a multimeter to test the moisture sensor?

If you don’t have a multimeter, it’s best to consult a professional technician to test and troubleshoot your dryer’s moisture sensor.

Can I test the moisture sensor on any type of dryer?

The testing process may differ slightly depending on the type and model of your dryer. It’s always best to consult the manufacturer’s manual for specific instructions.

How can I clean and maintain the moisture sensor in my dryer?

To clean the moisture sensor, gently wipe it with a soft cloth or sponge dampened with a mixture of mild detergent and water. Avoid using abrasive cleaners or materials that could damage the sensor.

What should I do if the multimeter readings indicate a malfunctioning moisture sensor?

If the multimeter readings indicate a malfunctioning moisture sensor, it’s recommended to contact a professional technician to diagnose and repair the issue.

Why is it important to test the moisture sensor on my dryer?

Testing the moisture sensor helps ensure that your dryer operates effectively and accurately detects the moisture levels in your clothes. This helps prevent over-drying or under-drying, which can impact the quality and lifespan of your garments.

Can I test the moisture sensor while the dryer is running?

It’s best to perform the moisture sensor test with the dryer turned off and unplugged to ensure safety and accurate readings.

Are there any safety precautions I should take while testing the moisture sensor?

Always unplug the dryer before attempting any maintenance or testing procedures. Additionally, exercise caution when working with electrical components and follow all safety guidelines provided by the manufacturer.

How long does the moisture sensor test usually take?

The moisture sensor test typically takes around 15-20 minutes to complete, depending on the specific steps and your familiarity with the process.

Will testing the moisture sensor on my dryer void the warranty?

Testing the moisture sensor should not void the warranty, but it’s always best to consult the manufacturer’s warranty documentation to confirm.