hi guys.dont know if anyone has had this problem with a scroll compressor.called out to wallcase with a zb21kce-pfj-551 single phase compressor.fitted suction guage,running but not pumping.switched off to check standing pressure.switched back on and the compressor started pumping.it worked for a week and did the same again.checked pressure switch settings with it being on pump down.ok.called out again last night and compressor would not start.switched off and called back this morning to take compressor details.switched it on and the compressor started up and worked.any ideas guys.thanks