If I set the auto cycle for heavy load, it indicates 63 min and will run until it gets to 30 min and will continue to run with the timer at 30 min. it takes a long time before it starts counting down again. The heat cycles on and off during the complete cycle. If I use other settings, the initial running time will be different and the time that the timer "freezes" will be different. I read in another sight that there was a pdf available on sensor issues, but I can not get to that pdf "http://www.servicematters.com/docs/wiring/Tech%20Sheet%20-%203978624.pdf". I would appreciate your help. Tom