I have had a model 00611A3 for over a year. The outdoor temp/humidity stopped displaying. I changed batteries in the sensor, and did get readings at some point. then it stopped. The inside of the sensor is corroded, so I bought a replacement sensor. The new replacement outdoor sensor is not connecting with the display unit. The sensor has ABC codes, the display unit does not. What setting should I use on the outdoor sensor? Does it matter? Thoughts?