Recently bought PID (Rex c-100). Got it all wired up and working but am having a minor problem with the programing. Got 3 different owners manual off the internet because it came with a Chinese instruction manual. There are some differences in the manuals and I cant be sure what to do. When I first hooked it up, I played around with it some and was able to do things like change the Lock code to 0000 and change the Temp in the SV window. Originally I was able to access the Mode screen and check out the settings for the SL1-SLwhatever. However, now I want to go in and change SL2 in order to get temps in Fahrenheit and I can no longer get to the Mode screen. Doing everything like I did before. (Holding the set and shift arrow at the same time for many seconds) Have I inadvertently done something. Has anyone else had this come up. I can live with Centigrade but would rather change.