Why Is My Pressure Switch Leaking Air and how to fix it?

The most common issue people have with their air compressors, is the pressure switch leaking air continuously from the unloader valve once the air compressor shuts off.

The issue we hear from customers is that the unloader valve on the pressure switch is bleeding air out continuously after it shuts off. That’s usually an indication that the check valve is stuck open. The way the check valve works is when the compressor is pumping air into the tank it pumps it to the check valve. 

When the compressor shuts off, the disc needs to close and hold the air in the tank. If it does not close, then the air will bleed out through the check valve and out the pressure switch unloader continuously until the compressor tries to start again. So if you’re having this issue where the air is bleeding out of the unloader valve continuously after it shuts off, then DON’T replace the pressure switch. You need to replace the check valve.

If you need help selecting a check valve that will fit your air compressor please reach out to our outstanding technical support team here at Pacific Air Compressors. We can help you troubleshoot any of your air compressor issues. Give us a call at (503) 674-2744 or contact us here.