This DIY repair guide explains how to replace the pressure switch on an air compressor. The pressure switch starts the pump motor as the tank empties and pressure drops to the cut-in pressure; the switch stops the motor when tank reaches the cut-out pressure.
Over time, the pressure switch wears out. If the pressure switch won’t start the pump when tank pressure drops below the cut-in pressure or won’t stop the pump when the tank reaches the cut-out pressure, replace the pressure switch with the manufacturer-approved air compressor part.
This procedure works on common Craftsman, Devilbiss, Dewalt, Campbell Hausfeld and Porter Cable air compressors.