This week we continued the sugyos of shehiya, and raised the question of whether it is permissible to set a timer on a hotplate to have it go on in the middle of shabbos. If the food is placed on it from before shabbos, it would seem that everyone maintains that this is permissible, (although the food has to be cooked in order not to have a sheiya issue). However, if you want to place the food on shabbos before it turns on, if the food is fully cooked it would be permissible but if the food isn’t cooked or contains a cooled down liquid this would be an issue of causing a cooking process to occur and would be assur.