Why Is My DeWalt Air Compressor Behaving Like a Runaway Train? The Answer Revealed
What To Know
- The pressure switch is responsible for sensing the air pressure in the tank and activating the compressor when the pressure drops below a certain level.
- Leaking air lines or fittings can cause the compressor to run continuously to maintain the desired pressure in the tank.
- This could be due to a faulty pressure switch, check valve, leaking air lines, a clogged filter or regulator, or a faulty unloader valve.
DeWalt air compressors are renowned for their reliability and performance. However, even the best equipment can occasionally encounter issues. One common problem is when the air compressor fails to shut off automatically. This can be frustrating and even dangerous if left unchecked. In this comprehensive guide, we will explore the potential causes of this issue and provide step-by-step troubleshooting solutions.
Pressure Switch Failure
The pressure switch is responsible for sensing the air pressure in the tank and activating the compressor when the pressure drops below a certain level. If the pressure switch fails, the compressor may continue to run even when the tank is full.
Troubleshooting:
1. Check the pressure switch connections: Ensure that the electrical connections to the pressure switch are secure.
2. Test the pressure switch: Use a multimeter to test the continuity of the switch. If it is not working, replace it.
Faulty Check Valve
The check valve prevents air from flowing back into the compressor from the tank. If the check valve fails, air may continue to enter the tank, causing the compressor to run continuously.
Troubleshooting:
1. Inspect the check valve: Check if the valve is stuck or damaged.
2. Clean or replace the check valve: If the valve is dirty, clean it thoroughly. If it is damaged, replace it.
Leaking Air Lines or Fittings
Leaking air lines or fittings can cause the compressor to run continuously to maintain the desired pressure in the tank.
Troubleshooting:
1. Check for leaks: Use a soapy water solution to spray around all air lines and fittings. Bubbles indicate a leak.
2. Tighten or replace fittings: Tighten any loose fittings. If fittings are damaged, replace them.
Clogged Filter or Regulator
A clogged air filter or regulator can restrict the flow of air, causing the compressor to run longer to maintain pressure.
Troubleshooting:
1. Clean the air filter: Remove the air filter and clean it thoroughly.
2. Inspect the regulator: Check if the regulator is clogged or damaged. If necessary, clean or replace it.
Faulty Unloader Valve
The unloader valve releases pressure from the compressor head when the tank is full. If the unloader valve fails, the compressor may continue to run even when the tank is full.
Troubleshooting:
1. Inspect the unloader valve: Check if the valve is stuck or damaged.
2. Clean or replace the unloader valve: If the valve is dirty, clean it thoroughly. If it is damaged, replace it.
Electrical Issues
Electrical faults can also cause the compressor to run continuously.
Troubleshooting:
1. Check the power supply: Ensure that the compressor is plugged into a working power outlet.
2. Inspect the wiring: Check for any loose or damaged wires.
3. Contact an electrician: If you are not comfortable troubleshooting electrical issues, contact a qualified electrician for assistance.
Other Possible Causes
In some cases, the following factors can also contribute to the compressor not shutting off:
- Oversized compressor: A compressor that is too large for the application may not be able to maintain the desired pressure and will continue to run.
- Excessive air demand: If the air demand exceeds the compressor’s capacity, the compressor may run continuously to meet the demand.
- Improper tank size: A tank that is too small for the compressor’s output may not be able to store enough air, causing the compressor to run more frequently.
The Last Word
Troubleshooting a DeWalt air compressor that is not shutting off can be a challenging task. By following the steps outlined in this guide, you can identify the potential cause and take the necessary steps to resolve the issue. Remember to always refer to the manufacturer’s instructions and consult a qualified technician if you are not comfortable performing any repairs yourself.
Top Questions Asked
Q: Why does my DeWalt air compressor keep running after I turn it off?
A: This could be due to a faulty pressure switch, check valve, leaking air lines, a clogged filter or regulator, or a faulty unloader valve.
Q: What are the electrical issues that can cause my air compressor to run continuously?
A: These issues include a faulty power supply, loose or damaged wiring, or a malfunctioning electrical component.
Q: How do I know if my air compressor is oversized for my application?
A: If the compressor runs continuously or cycles on and off frequently, it may be oversized.
