You are probably right. I have the instructions and if I can figure out how to post an image I'll post it here. At the bottom of the instructions, there is a picture of the back of the timer, and the words: "Note: for ranges with Self Clean capabilities, add jumper as shown in the following picture. If not self-clean, please remove the jumper (bridge)" The picture shows the back of the timer with the transformer on the left side, and the self-cleaning position for this jumper is the right most 2 pins. The jumper is located along the bottom of the circuit board. I'll bet you don't have this jumper installed. Because of the note's information.