When dryer is on sensor dry settings (any) the timer is not moving. The dryer is heating but not shutting off. The timer does not move. There is no resisance at the moisture sensor. It functions as desired on timed drying.
Answer Hello Peter,
The only thing that will cause the timer not to advance in the automatic cycles and advance in the timed cycles is a crimped or clogged exhaust duct. To prove this, dis-connect the duct from the back of the dryer and set the timer to an automatic cycle, noting where the timer knob is pointing. Look at it again in five or ten minutes and you will see that it has advanced. The restricted exhaust causes the pressurized heat and moisture to blow past the felt drum seals back into the cabinet, where it is circulated back across the moisture sensors. This prevents the timer from advancing.