I went to the customer's home to perform a service call on a Five Star 16 SEER 2 Ton Air Conditioner. I cycled the system and checked refrigerant pressures. I found subcooling was 9-10 but my superheat was bouncing around from 13-27 degrees and would not stable out. I then went down stairs to make sure the TXV bulb was mounted properly and secure. The TXV was bad and needs replaced.
