I have this unit tripping on low discharge superheat. I have verified sensors and pressure transducers are ok. We have changed flash tank level sensor because to old one was bad and. Ow this problem keeps showing up. I was having problems with the latest sensor put in late last year and have replaced it again with the latest and greatest version which I believe is the same as the last one changed, feed valves and drain valves work correctly in test mode and seem to be working ok when running. I suspect when Economizer is on we are dumping some liquid back on compressor and that the flash tank is to full and level senser is bad again. Was hoping someone who has run into this might have some ideas. Thanks for any input.