No heat. The geo was locked out on low pressure. Tested the pressure switch, it was open. Checked system pressure. The standing pressure was 40 psi. I checked for refrigerant leaks. Found the sensing bulb tube wore through the copper discharge line. I recovered the refrigerant from the system. I repaired the discharge line by brazing the the worn area. Pressure tested system. Pulled system into a vacuum and held at 500 microns. I added the factory charge of refrigerant to the system. I cycled the system. It’s heating properly at this time.