Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › a/c problem › a/c problem August 13, 2019 at 5:44 pm #894236 college manModerator Not sure what your working on? If you added a can of refrigerant and are at zero on both gauges you have a leak. As for the ports setting off the electronic detector. There could be a leak or oil refrigerant residue.