Is your dehumidifier refusing to turn on when you need it most? You’re not alone. Many people face this frustrating issue, especially during humid months when a working dehumidifier can make all the difference in comfort and air quality.
Key Takeaways
- Evaluate Power Supply: Ensure the dehumidifier is plugged into a working outlet and check the condition of the power cord for any visible damage.
- Inspect the Thermostat: A malfunctioning thermostat may prevent the dehumidifier from turning on, so check its settings and calibration to ensure they align with current humidity levels.
- Check Water Tank: A full water tank can trigger a safety shut-off. Make sure to empty and correctly reseat the water collection tank to restore functionality.
- Follow Troubleshooting Steps: If the unit won’t power on, check the outlet, examine the power cord for damage, and reset the unit by unplugging it for 10 minutes before plugging it back in.
- Maintain Regularly: Keep your dehumidifier performing optimally with regular cleaning and timely filter replacements to enhance efficiency and prolong lifespan.
- Know When to Seek Help: If basic troubleshooting fails or you notice unusual noises, water leaks, or inconsistencies in performance, consider consulting a professional to avoid further damage.
Common Reasons Why A Dehumidifier Won’t Turn On
A dehumidifier that won’t turn on can disrupt your comfort. Understanding some common reasons why this happens can help you troubleshoot effectively.
Power Supply Issues
Check the power supply first. Ensure the dehumidifier’s power cord is securely plugged into a functioning outlet. Test the outlet by connecting another device. Inspect the power cord for signs of damage, such as fraying or breaks. If you’re using an extension cord, ensure it’s rated for the dehumidifier’s power requirements.
Faulty Thermostat
A faulty thermostat can prevent your dehumidifier from turning on. Ensure the thermostat setting is appropriate for the current humidity levels. If the humidity is already low, the unit may not activate. Consider checking the thermostat’s calibration if it continues to malfunction. If adjustments don’t help, replacing the thermostat might be necessary.
Full Water Tank
A full water tank can trigger a safety mechanism that stops the dehumidifier from operating. Check the water collection tank and empty it if it’s full. Make sure the tank is correctly reseated after emptying, as improper placement can prevent the unit from turning on again.
Troubleshooting Steps
If your dehumidifier won’t turn on, follow these troubleshooting steps to identify and resolve the issue.
Check Power Outlet
- Inspect the outlet. Ensure the power outlet is operational. Test it by plugging in another device, like a lamp or phone charger. If it doesn’t work, the issue lies with the outlet.
- Examine the power cord. Look for any visible damage along the power cord. Frays, cuts, or burns may indicate a need for replacement.
- Plug directly into the wall. Avoid using extension cords or power strips. These can lead to connection issues that prevent the unit from powering on.
- Unplug the dehumidifier. Shut off the unit by disconnecting it from the outlet. Wait for about 10 minutes before plugging it back in.
- Check the manual. Refer to your user manual for specific reset instructions. Some models feature a reset button or a unique sequence for rebooting.
- Test the functionality. After resetting, turn on the dehumidifier. Monitor its performance to see if it powers up as expected.
These steps can help you troubleshoot common issues that may prevent your dehumidifier from turning on.
Maintenance Tips for Dehumidifiers
Keeping your dehumidifier in top shape prevents it from failing to turn on and ensures consistent performance. Follow these maintenance tips for optimal operation.
Regular Cleaning
Regular cleaning helps maintain airflow and performance. Dust and dirt can accumulate in the filters and external components.
- Clean the Water Tank Weekly: Empty the tank and wash it with warm, soapy water. Rinse thoroughly to remove any soap residue.
- Wipe Down Exterior: Use a damp cloth to clean the outside of the unit. Avoid using harsh chemicals that could damage the surface.
- Clear Air Intake and Exhaust: Inspect and clean the air intake and exhaust vents regularly. A blocked vent can reduce efficiency and lead to overheating.
Filter Replacement
Replacing the filter maintains air quality and helps your dehumidifier run smoothly.
- Check the Filter Monthly: Inspect the filter every month. If it looks dirty or clogged, it needs replacement.
- Choose the Right Filter: Ensure you select a filter compatible with your dehumidifier model. Refer to the user manual for specifications.
- Follow Installation Instructions: When replacing, follow the manufacturer’s guidelines for proper installation to avoid air leaks.
Maintaining your dehumidifier through regular cleaning and filter changes can significantly prolong its lifespan and enhance its efficiency.
When to Seek Professional Help
Recognizing when to call in a professional for your dehumidifier issues can save time and prevent further damage. Consider seeking expert assistance in the following situations:
- Persistent Power Issues: If your dehumidifier remains unresponsive after trying basic troubleshooting steps, it’s time to consult a technician. This often indicates internal electrical problems.
- Unusual Noises: Strange sounds—like grinding, rattling, or excessive buzzing—can suggest mechanical failures. A professional can diagnose and resolve these issues effectively.
- Frequent Short-Cycling: If your unit turns off and on repeatedly within a short period, it may signal an underlying problem. A technician can evaluate the system and address potential root causes.
- Water Leakage: Excessive moisture or leaks around the dehumidifier can indicate serious issues with seals or internal components. Professional evaluation will help prevent water damage to your home.
- Inconsistent Humidity Levels: If your dehumidifier struggles to maintain appropriate humidity levels despite running consistently, it might require a professional inspection. This could involve checking for compressor issues or airflow obstructions.
- Age of the Appliance: If your dehumidifier is over 10 years old and shows signs of failure, consider professional help. Weigh the cost of repairs against purchasing a new unit.
By keeping these scenarios in mind, you ensure your dehumidifier receives the attention it needs, leading to improved performance and longevity.
Conclusion
Dealing with a dehumidifier that won’t turn on can be frustrating but you don’t have to face it alone. By following the troubleshooting steps outlined in this article you can identify the issue and potentially get your unit running again. Regular maintenance is key to keeping your dehumidifier in top shape and preventing future problems.
If you find yourself stuck or the issue persists don’t hesitate to reach out to a professional. Taking action early can save you time and ensure your home stays comfortable and healthy. Remember a little care goes a long way in extending the life of your dehumidifier.
Frequently Asked Questions
Why won’t my dehumidifier turn on during the humid months?
A dehumidifier may not start due to various reasons, such as a power supply issue, a faulty thermostat, or a full water tank. Ensuring proper troubleshooting can help identify the underlying cause and restore functionality.
How can I troubleshoot a non-working dehumidifier?
Check the power outlet, inspect the power cord for any damage, and avoid using extension cords. Try unplugging the unit for about 10 minutes, then plug it back in. Refer to the user manual for reset instructions.
What maintenance does my dehumidifier need?
Regular maintenance includes cleaning the water tank, exterior, and air intake/exhaust vents to maintain airflow. It’s also essential to check and replace the filter monthly for improved air quality and efficiency.
When should I seek professional help for my dehumidifier?
Consider contacting a technician if you experience persistent power problems, unusual noises, water leakage, or inconsistent humidity levels. Seek help if your dehumidifier is over 10 years old, as older units may require more attention.
How can I prolong the life of my dehumidifier?
To extend your dehumidifier’s lifespan, perform regular maintenance like cleaning the tank and replacing the filter. Ensure proper usage by troubleshooting issues promptly and avoiding overuse or neglect.

Jake Newman is Appliance Mastery’s expert on refrigeration and cooling systems. With over a decade of experience in the appliance repair industry and certification from NASTeC, Jake is a trusted source of knowledge for homeowners who want to troubleshoot and repair their fridges, freezers, and air conditioning units.