I have 4 of these units that all seem to post random "pump down alarms" from time to time. I have tested all the obvious and nothing is leaking by. I'm suspecting something electronic but I haven't been able to narrow it down yet. Also, can anyone think of a condition of operation that would flood the coil with refrigerant and not allow it to pump down within the time allowed (120 seconds I think). I don't see flooding or low superheat during normal operation. It seems to be just a nuisance alarm but it disables half the machine, along with those condenser fans, and overloads the other circuit, sometimes causeing high pressure trips, other times causing it to just loose the load and generate a comfort complaint. Any ideas would be appreciated. Thanks.