Hi, It depends a bit on what type of compressor this is. Is it a screw compressor or a piston compressor? I will assume we are talking about a rotary screw compressor here. Screw compressors can run 'loaded' and 'unloaded'. When it runs unloaded, it runs, but it doesn't product any pressure. Please check that your compressor is not set to 'unload' manually (there's a switch). There could also be something wrong with the control system that makes this compressor run 'unloaded' all the time. All the best, Cas