I took off the cover and noticed that a 3A fuse was blown, so I replaced it and tried to power it up and it blew the fuse right away. Hi, I was wondering if you might have any information on a Rockworth Classicair 2 gallon air compressor? I received this from a friend because it was dead. If your tank pressure is zero PSI, then the pressure switch should have tripped to on, and power should be flowing across the switch to the motor side. If not, your pressure switch itself may have failed, assuming it tripped to on when the pressure in the tank fell below the normal cut-in pressure setting.
Is there power on the motor side of the switch? Using your multimeter or poke probe, you want to see if the power is flowing from the line side to the motor side, so you are going to test the motor side of the switch. You may see the terminals labeled as line (the power supply in from the plug), load (the power supply to the motor), the terminals might be marked as power supply, motor… a variety of labels if your compressor power switch has labels at all. 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.
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