# It is forbidden to set a timer before [[shabbat]] to automatically operate a dishwasher on [[shabbat]]. <ref> Shemirat Shabbat Kehilchata 12:37, Menuchat Ahava 1.24.31. The Shemirat Shabbat Kehilchata's proof is that when you close the door even though it is totally off it is considered a grama when the melacha will occur later like we find in Mishna Brurah 253:100. [http://www.yutorah.org/sidebar/lecture.cfm/859947/rabbi-hershel-schachter/status-and-applications-of-use-of-electric-appliances-and-devices-on-shabbat/ Rav Hershel Schachter (Electricity on Shabbat min 35)] explained that it was forbidden to use a dishwasher on Shabbat even if it is going to turn on at a later time since closing the door is considered a grama for when the timer will turn on.
Since the dishwasher doesn't function if it isn't closed it may not be used. It is also forbidden to illegally get a mechanic who will break the dishwasher so that it starts even if the door isn't closed.</ref>
# Most poskim are lenient to allow wearing an automatically winding watch if it is still running.<ref>Yabia Omer OC 6:35 writes that according to his opinion that as long as the watch is still running then it is certainly permitted to wear a watch that self-winds while it is still running. He adds that even those who hold that it is forbidden should agree with the automatic watch since it is a pesik reisha dlo nicha leh on a derabbanan. Additionally, it could be a shinuy and also derech levisha (Rav Poalim 1:26). Chelkat Yakov 1:75, Tzitz Eliezer 9:20, Shemirat Shabbat Khilchata p. 162, and [http://www.dailyhalacha.com/m/halacha.aspx?id=750 Rabbi Mansour] agree that an automatic watch is permitted. Az Nidbaru 2:39 says it is forbidden. </ref>