Let me clarify a couple of things. Super Dave is right about the H...It indicates the probe is either not attached, or is bad (not reading it). This is often the connection, as stated.
When programming the controller, the probe does not have to be attached; it will program just fine. It does, however, have to be attached when cooking to an internal temp. If you do not have the probe attached, press the "Time" button and the right window will show the elapsed time vs the -H-. When programming to trigger the changed by internal temp, you want the "F" displayed in the right window, not the lower-case "t"...that's to trigger time.
Hope this helps! If you are sure the probe is attached well, and the connections are clean and tight, you may have a bad probe (it happens). Contact Steve for a replacement.