HI CAS,
THERE IS A GA200 2013 MODEL COMPRESSOR THAT IS NOT LOADING. SOLENOID VALVE HAS BEEN CHANGED, UNLOADING VALVE UNITS HAVE BEEN SERVICED, MINIMUM PRESSUTRE VALVE HAS BEEN SERVICED AS WELL BUT ALL TO NO AVAIL. THE PRESURE OF THE COMPRESSOR IS AT 0.1 BAR AND IT DOESN'T EVEN MOVE WHEN YOU START THE COMPRESSOR. THE DP AIR FILTER READING ON THE ELECTRONIKON BEFORE START IS 0.025 BAR WHICH SHOULD HAVE BEEN 0.000 BAR AND DOESN'T ALSO CHANGE AFTER STARTING THE COMPRESSOR. AS A MATTER OF FACT, I CHECKED THE SOLENOID VALVE BUT THE AIR FROM THE OIL RECEIVER FLOWS TO THE INLET OF THE SOLENOID VALVE BUT THE OUTLET OF THE SOLENOID TO THE UNLOADING VALVE DOES NOT PRODUCE AIR OR PRODUCES LITTLE AMOUNT OF AIR. 
WHAT CAN BE THE POSSIBLE REASON FOR THE COMPRESSOR NOT LOADING?