System Not Heating - 22 year old Trane system System not heating due to multiple issues, all issues relate back to the system age. The heat exchanger is cracked and the high limit is burnt up. The main control board has failed and is not sending voltage to the gas valve. The system is also running the fan even with the thermostat turned off and fan set to auto. I turned the breaker off with the owners permission, the fan running was making it even colder in the home. The heat exchanger is a safety concern due to exhaust gas being able to escape from the cracks and enter the home through the vents. I went over the age, condition and cost of temporary repairs. I also went over the age of the AC, it is 19 years old and operating on R-22 refrigerant. R-22 refrigerant went through a Government Mandated Phaseout and is no longer available, nor are refrigerant related components. She requested we send out an install supervisor to go over updating the equipment, I scheduled that for today be