 One typical challenge is the auto-shut-off which automatically shuts off the heat after a predetermined number of hours.For an appliance to be compliant with religious requirements when Shabbat mode is operating, the standard six- or twelve-hour automatic shutoff should be overridden, and all lights and displays (for example, a light that might go on when the door is opened) should be disabled.However, several manufacturers have not dealt with the issues caused by the heating elements and the thermostats, which in some sabbath modes continue to operate as normal, which is in contradiction to normative halachic opinion.