Installation was easy and no problem. After less than 9 months, the knob/switch does not work or burner in the middle does not turn on. The other four still work, turn on and white LED indicates being on, turn off and red LED indicates still being hot. The middle does nothing. I've made sure to remove the knobs and make sure there is nothing underneath them that may have got in there, all of them look as good as new. I registered the model and serial number under my name, as the landlord replaced the ancient one with this one on February 16, 2024. I am just surprised it has suddenly and completely stopped working in the middle burner.