I was due for a cleaning on my harman xxv ,and was noticing ,that before I cleaned it,it was running at low speed. I also noticed the top was rather hot for not running at max temp. After I cleaned it probe and all,it seems the stove will not go into high speed. I’m in my 14th year and never had any problems. Does anyone know what it could be,board broblem,or blower problem. Thanks! Any help would be appreciated.