Question about Dewalt 2 Hp 4 GAL Air Compressor

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Air compressor won't stay running even with resetting

My dewalt air compressor starts up then goes back off I hit the reset button and again the same thing happens over and over again

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How quickly does it shut off? Is it reaching the turn off psi? or is it immediate.
If it is immediate then it is probably a power supply issue.
Air compressors are power hogs. For instance, a compressor may work fine on an outlet using the supplied power cord, but plug it into an extension cord that is insufficient for it and a repeat of your problem will occur. If you use an extension cord make sure it is made just for this kind of application. Also, if possible, give the compressor a dedicated circuit.
Another problem might be your unloader valve not working correctly. This reliefs the pressure inside the pump after the motor has stopped. it would sound like the pump is working extra hard at start-up.

Posted on May 22, 2009

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Wow thanks alot mate! my compressor died yesterday and i had no idea what was wrong, i removed / cleaned check valve and regulator and was about to remove compressor / motor and take apart, also contemplated replacing relay / capacitors!

you saved me all the hassel, i was using a 10amp extension cord ( 20 meters ) on my 10 amp compressor, it worked for about 1 week this way but now it only works when i plug it directly into the wall!

thanks again!

Posted on Apr 04, 2010

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he needs to blow off by pressostat (pressure switch)before it can free start , BUT it can also happens that your capacitor is broken then there is no start direction and then there is also no start only humming sound

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Location of reset button


Its on the motor look around it should be easy to axcess And make sure you are have a big enough breaker that you are running the mechine off that will over heat the motor and cause the reset to pop off

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Hi what happens is i turn on the compessor it hums only then the thermal cutout cuts out after 10 seconds or so i turn off reset thermal cut and try again same thing happen thank in advance


you may be drawing too much current thru cord causing relay to trip, plug compressor cord directly into 20 amp circuit. As these tools get older and used the motor windings get hotter. Try pumping up with no pressure in tank and tank bleed valve open. I have experienced this dozens of times with many makes of small to mid-sized compressors.

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Doe not run. is there a reset button


Yes there is a reset button on the motor.
You can see it from the front of the compressor but it is a little hard to see and get to so you will have to get it at eye level to get a good view.
These will normally trip is you have low current or are running the compressor on an extension cord.

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