Some compressor switches have these terminals labeled. Pressure switches often have terminals where the wires are attached. Typically the green wire is the ground wire.Īlso, typically, the black wires are hot in and the white wires are the hot return. Generally speaking (and this is anecdotal as I am not an electrician – don’t pretend to be – and do not dispense electrical advice) the wires of a 120-volt circuit are going to be white, black, and green. If your compressor is plugged into a wall socket, the screws (terminals) will be powered, and if you touch them and you are grounded, you might be electrocuted! If your compressor is a 220-volt compressor I recommend that you do not mess with this at all! You will see something along the lines of what the photo above shows you – a bunch of wires attached to screws. We need to try and find out if the pressure switch has tripped to the on position, and if power is flowing through it to the motor circuit.Ĭarefully remove the pressure switch cover. What Does the Compressor Start Capacitor Do?.What Else Stops an Air Compressor From Starting?.Remove the Air Compressors Pressure Switch Cover.Is Power Getting to the Air Compressor Motor?.Air Compressor Still Will Not Start – Secondary Troubleshooting Checks.What is the Air Pressure in Your Compressor Tank?.Air Compressor Will Not Start – Primary Troubleshooting Checks.Follow the guide below to figure out why an air compressor will not start. There are many types of air compressors in use around North America, and though many of them look different than other air compressors, and they certainly vary in size and other areas, there are similarities that will allow you to check and see why “an air compressor will not start, by yourself and hopefully not taking it to a shop which is both expensive and time-consuming. Hey! This site is reader-supported and we earn commissions if you purchase products from retailers after clicking on a link from our site.

Quincy 7.5 hp air compressor