Why does my dx200s stove switch past its sell-by date automatically ? I haven't put on a timer or anything like that.

I haven't put on a timer or anything like that.
Answers:    Probably wired to an E7 circuit which is (timed) cheap rate. I'm guessing that these are bedroom convectors, and you own storage heaters in some rooms?
maybe it is a saftey timer so that it dosent overheat