So, if it gets stuck in Sensing mode, that means that something has gone wrong with that process, and it can't start the drying cycle. At first glance, you may be dealing with a problem with the moisture sensor. Just like with previous problems, be sure to check and clean the moisture sensor and see if it works then.
Why does my Whirlpool dryer keep saying sensing?
There are sensor strips in the drum of the Duet dryers. As your load of laundry tumbles in the drum, it makes contact with the sensor strips so that the dryer can end the cycle when the laundry is dry. The drying cycle can end early if the dryer is not level.
How do you fix a sensing Whirlpool Duet dryer?
https://www.youtube.com/watch?v=k-K2hUt8N2M
How do you reset Whirlpool dryer?
If your Whirlpool dryer displays a "PF" error code, indicating a recent power failure, the dryer will need to be reset and restarted. This is done by pressing "Start" for a few seconds to restart the dryer. If the dryer does not restart automatically, select a new cycle and any options then press "Start" to begin.