every time cook is burn out even dial set at 350, 1 Hr the meat burn to black. How can I fix this problem? I saw the temp. wire from the control dial go inside the oven but it still not control by temp. set, It is keep fire it is not shutoff by temp. set that why it is burn every time. I think the control unit NG or the temp. sensor NG ??? Can you help or if we change a new control dial unit where I can buy or what is a part number??? Thank you in advance. Thien Nguyen