I had a problem last year with my Harman that is very similar to yours. I first replaced the room sensor and the ESP but it did'nt help, and the stove still would'nt shut down. I got a hold of a great dealer (that did'nt sell me the stove) and they replaced the board. I purchased my stove in 2008 and was on the very last days of the warranty for electrical - Harman covered it! It worked and has been flawless ever since (knock on wood). The dealer told me they had other customers that had the same problem so they were familiar with the cure. Good Luck.
So what was you stove doing exactly? Please describe, i really dont what to purchase something that isnt going to fix it.....