It could be the element itself has gone u/s. If you or a friend are competent to take the machine apart, check trhe lement and replace it yourself ((http://www.espares.co.uk/search/mo1540893/breadmakers/small-appliances/kenwood/bm250?SearchTerm=element) then fine. Otherwise it would probably be better/cheaper to get a replacement. May one recommend a Panasonic machine?
Crumbs, January 2015