According to the instructions, you must not remove the four rubber plugs from the grill grate. So we left them on. What happens? At the back left of the interior, the first time it is put into operation, it sparks. There is a smell of burning. Eh?! Is the rust broken or the wall or what...? So rust out, check interior, check rust, rubbers gone, rust back in, test. Lo and behold: nothing works. Rust out, rubber on, rust in, test. FUNCTION. I'm not putting these things back on.