Hi JDM, I have exactly your problem! Same TC Amplifier, using RAMPS (but repetier firmware).
I'm sure I have made the right edit to pin.h (I am using repetier, but also tried marlin - same result). My TC is showing 499degs C when first turned on, and printer goes to "dry run" mode
I would greatly appreciate it if you could show where you made the changes you made to configuration.h and pin.h , which solved the problem for you.