I am working on a sanyo mini split heat pump system. Indoor unit is a KHS1271 and the outdoor is a CH1271. I keep getting a SO1 code which is a sensor failure. I have replaced the temp sensor, the unit worked fine for 1 week then the code came back. I have talked to sanyo tech three times but they keep sending me the 5 step process to diagnose the unit. I have tested each component as directed and they all test ok as far as correct voltage and resistance measurements. When I talk to the supply house they tell me to call the tech line. This is the second sanyo unit I have installed and have had problems with both. Any suggestions will be very appreciated. Thank You