In the last year I have replaced both fans, the door gasket, baffle, and now when I try to power up and start the stove it goes into cleaning grate and will not stop, it will run and run unless I unplug the unit. I have tried to press the start button to get it going and it says wait for start up. The stove has not been used this year so it is not hot. Could a sensor be bad or something like this? HELP