If your DeWalt air compressor seems to be running incessantly, leaving you baffled, you’re not alone. This common issue can be frustrating, but understanding the underlying causes can help you troubleshoot and resolve the problem. In this comprehensive guide, we will delve into the possible reasons why your DeWalt air compressor keeps running and provide step-by-step solutions to get it back in optimal working order.
Pressure Switch Malfunction
The pressure switch is a crucial component that controls the compressor’s operation. When the pressure in the tank reaches the set limit, the switch triggers the compressor to shut off. However, a faulty pressure switch can cause the compressor to continue running even when the tank is full. Check the pressure switch for any damage or loose connections and replace it if necessary.
Air Leaks
Air leaks can result in a loss of pressure, which tricks the compressor into thinking it needs to run continuously. Inspect all hoses, fittings, and connections for any visible leaks. Use soapy water or a leak detection solution to identify and seal any leaks you find.
Unloader Valve Issue
The unloader valve is responsible for releasing the built-up pressure in the compressor head when the compressor is turned off. If the unloader valve fails to open properly, pressure can remain in the head, causing the compressor to keep running. Check the unloader valve for any damage or debris and clean or replace it as needed.
Worn Piston Rings
Piston rings create a seal between the piston and the cylinder walls. Over time, these rings can wear out, leading to reduced compression and air leakage. As a result, the compressor will need to run more frequently to maintain the desired pressure. Consider replacing the piston rings if they are worn or damaged.
Electrical Problems
Electrical issues can also cause the compressor to run continuously. Check the power cord, wiring, and connections for any damage or loose contacts. Test the electrical components using a multimeter to identify any faults and repair or replace them accordingly.
Overheating
Excessive heat can trigger the compressor’s thermal overload protection, causing it to shut off temporarily. Once the compressor cools down, it will resume running. If overheating occurs frequently, check the air filter for clogs, ensure proper ventilation, and consider using a cooling fan to dissipate heat.
Other Possible Causes
In some cases, other factors can contribute to the compressor running continuously. These include:
- Faulty check valve: The check valve prevents air from flowing back into the pump when the compressor is turned off. A damaged check valve can cause the compressor to run to maintain pressure.
- Stuck pressure relief valve: The pressure relief valve releases excess pressure in the tank. If it gets stuck, it can prevent the compressor from shutting off when the pressure reaches the set point.
- Dirty or clogged air filter: A clogged air filter restricts airflow, reducing the compressor’s efficiency and causing it to run longer to achieve the desired pressure.
The Bottom Line
Understanding the reasons why your DeWalt air compressor keeps running is essential for effective troubleshooting. By following the steps outlined above, you can identify and resolve the underlying issue, ensuring that your compressor operates smoothly and efficiently. Regular maintenance and proper usage can also help prevent these problems from occurring in the future.
What People Want to Know
Q: Why does my DeWalt air compressor run for a few seconds and then stop?
A: This could be caused by a faulty pressure switch, air leaks, or a stuck unloader valve.
Q: What does it mean when my air compressor runs but the tank doesn‘t fill?
A: This likely indicates a problem with the piston rings, check valve, or air filter.
Q: How often should I service my DeWalt air compressor?
A: Regular maintenance is crucial, and the frequency depends on usage. Generally, it’s recommended to service the compressor every 100-200 hours of use or annually.
