Stove convection fan not working

[SIZE=3]The convection fan on my Jenn Air JDS9860AAW does not come on at all. There are no error codes and the little fan on the display shows it working.[/SIZE]
[SIZE=3]Some things I checked:[/SIZE]
[SIZE=3]The oven lock does work on clean mode [/SIZE]
[SIZE=3]I pulled the fan and checked it. It works on hi and low [/SIZE]
[SIZE=3]The downdraft fan is not hooked up if that matters. [/SIZE]
[SIZE=3]Is there a way to check the board? The cooling fan runs ok and everything else works.[/SIZE]
[SIZE=3] [/SIZE]
[SIZE=3]Thanks in advance for any help[/SIZE]
[SIZE=3]Nelson[/SIZE]