I found my error was not pressing finish, so press 1 and set temperature and time, then press 2 and set temperature and time, then finish, then the run button. If one side only set, one display shows temperature the other time, if two set, both displays alternate between temperature and time.
I know to test by opening draws now, but setting it to do chips, only to find chips were in draw 2, but it heated draw 1, is not funny.