Dear JG, The probably is probably the pressure regulator switch. It's the box the 110 vac wires come from the outlet and go into. Reset the switch or replace it. Note! overfilling an air pressure tank is extremely Dangerous. The tank, fittings, compressor head and or related parts may explode resulting in property damage as well as serious and potentially fatal personal injury. Good luck, shag79
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The over-pressure relief valve may be defective if the valve is opening before the desired tank pressure is reached. If not, then the shut-off pressure adjustment (if there is one) may be set wrong. You'll need to find out from the manufacturer exactly what static tank pressure the compressor is designed to provide and then determine if it is working correctly. If so, then the relief valve might be defective. DO NOT attempt to defeat the relief valve under any circumstances - it can result in compressor damage or a dangerous tank failure.
If the motor doesn't shut off at the desired pressure then your pressure switch is either set too high or is broken/stuck. The pressure leak at 150 psi is the safety valve doing its job opening when the pressure gets to an unsafe level in the tank.
A regulator controls the pressure in the air line leaving the compressor and does not affect when the compressor turns on or off.
The pressure switch monitors the pressure in the tank and turns the compressor motor on and off when the switch closes or opens in response to changes in the tank pressure. If the compressor does not shut off, it is possible the pressure switch has been set to a pressure level that is higher than the compressor is capable of attaining, thus it does not shut off.
The compressor is capable of developing 150 psi and is noted as having a "120 psi cut-in pressure". When you say it doesn't shut off, does that mean it will generate 150 psi or more of pressure and fails to shut off or it develops less than 150 psi and does not shut off.
If the compressor does not generate 150 psi, then it is probably somewhat worn out and not capable of developing enough pressure to meet the factory high pressure limit. I would try adjusting the pressure switch upper pressure limit down to 130 psi or less (less if the compressor will not develop 130 psi) and see if this solves your problem If it doesn't,
If the compressor will develop 150 psi or more, then try adjusting the high pressure limit to less than 150 psi. If you can't adjust the high pressure limit then the pressure switch is defective and needs to be replaced.
The compressor has a max psi setting of 150.If the pressure is not reaching this or is only stabilizing at a low pressure you have an air leak around a gasket somewhere.If it is reaching 150psi and not shutting off your pressure switch is bad.Replace it.Check your owner's manual for a part number or go to www.factoryauthorizedoutlet.com to find the part.
Pressure switch has gone bad and needs to be replaced. Part runs around $25. Go online and put in model number, pressure switch. You will find companies that sell replacement parts. I had to replace mind, it did the same thing.
it sounds like the pressure switch is malfunctioning and should be replaced. I would recommend going to Dewaltservicenet.com and typing in your model number for a breakdown for this compressor and replacement parts.