The pressure sensor is likely defective. How old is it? take it to a Dewalt service centre
SOURCE: Compressor builds up pressure but does not release
i would check the regulator and adjust it for more pressure
SOURCE: compressor won't kick back on when its suppose too
The tank check valve is probably bad. Folow the large discharge line off the head, disconnecting one end of it. If you get air out of the line you have a bad check valve. If you don't get air you are probably looking at a valve job.
SOURCE: Dewalt 4 gal air compressor will not build pressure in take.
The bleed valve is an unloader of sorts that allows the compressor to start with-out a load. It closes when the pressure in the airline reaches about 20-25lbs with good volume. If air volume is not sufficient, the valve will not close. To solve the problem lets do a few tests. A long cord will reduce power and reduce air volume. Try powering the compressor with-out extension cord. If bleed valve closes when you do not use a cord, the compressor is not getting enough voltage, use shorter cord of the 12 gauge quality and more hose to reach work. If valve still does not close, check for air leaks on all fittings including around pressure switch and drain valve with soapy water. Repair as necessary and retest. If no leaks were found, temporarily plug bleed valve port with screw/bolt and run compressor till set pressure cut-off while counting minuites/seconds. The compressor should fill and shut off within three minutes or so. If it takes an unusually long time to fill, then the reed valves /valve plate is worn and leaking pressure back into cylinger. Leaking valves will usually result in very hot discharge airline/air. Reinstall the bleed valve after test. Parts and partslist are available at www.toolpartsdirect.com . Good luck on the repair and email if you have other questions.
SOURCE: my d55141 compressor that i've
There are a few things you will need to check.
If the unit is making more noise that it has in the past then the CAC-1212 tube seal could be damaged. If the compressor is not making more noise than normal then you will need to check the piston ring on the piston as well as the both the intake and exhaust reed on the valve plate plate.
Here is a parts diagram for you to view:
http://shoppingcart.msservicecompany.com/msservice_net/product_files/D55141/D55141_PL.pdf
SOURCE: dewalt air compressor keeps running until pressure
The regulator switch/unloader is bad or out of adjustment. Perhaps though the gauge is faulty. 200 psi in a 120psi compressor is dangerous, don't run it until it is fixed!
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