Troubleshooting Common Issues with Oil-Free Air Compressor Power On

Oil-free air compressors are essential tools used in many industrial and non-industrial applications. They're designed to provide reliable compressed air while operating quietly and without oil contamination. However, there may be times when your oil-free compressor won't power on. In this article, we'll discuss some of the common problems that can cause an oil-free air compressor not to power on and how to troubleshoot them.

Power Source

The first thing to check when your oil-free air compressor won't power on is the power source. Ensure that the outlet is switched on and that there is power coming from it. Check for any tripped circuit breakers or blown fuses that could cause the compressor to shut down. If the issue is related to the power source, resolve it before proceeding to other troubleshooting steps.

Pressure Switch

The pressure switch is a crucial component of the compressor that controls the on/off operation. If the pressure switch is damaged or faulty, it can prevent the compressor from turning on. To test the pressure switch, first unplug the compressor and remove the cover that encloses the switch. Check the contacts for signs of burning or corrosion. If there is visible damage to the contacts, replace the pressure switch.


The capacitor is responsible for providing the motor with the initial boost required to start up. If the capacitor is malfunctioning or defective, it can prevent the motor from receiving the necessary power to turn on. To test the capacitor, use a multimeter set to capacitance mode. Remove the capacitor from the compressor and discharge any residual electricity by touching the terminals with a screwdriver. Then, connect the multimeter leads to the capacitor terminals. A working capacitor should read within 10% of its rated capacitance. If the reading is outside this range, replace the capacitor.


The motor is the core component of the compressor that drives its operation. If the motor is burned out or damaged, the compressor will not turn on. To test the motor, unplug the compressor and remove the belt from the motor pulley. Then, try to spin the motor shaft by hand. If it's difficult or impossible to turn, there may be an issue with the bearings or rotor. A qualified technician can test the motor windings and diagnose any issues.


Check the wiring connecting the compressor to the power source. Loose, broken, or damaged wires can interfere with the compressor's power supply and prevent it from starting up. Ensure that all connections are tight and secure. If you notice any damaged wiring, repair or replace it as needed.


There are several reasons why your oil-free air compressor may not power on. By troubleshooting common problems like the power source, pressure switch, capacitor, motor, and wiring, you can determine the root cause and take corrective action. If you're unable to diagnose and fix the problem yourself, it's best to contact a professional technician who can assess and repair your compressor.

Similar Posts