Checked the two Trane Rtus for no heat. Found the thermostat set at 63 deg on the North unit. Programmed the thermostat to 69 deg per the customers request. Found the unit heating normal after setting the thermostat. Found the South unit not heating due to a failed ignitor. Replaced the ignitor. Found the unit heating normal after repairs. Secured the thermostat to the subbase and set the program to match the other stat.