Hi,

If the shaft will not turn on the oven temp control, the control may be
seized and bad. Control comes up as no longer available on this 1992ish
oven.

Might this mean that the igniter is burned out?

Normally no...the control could still be set but the ignitor would not
come on.

jeff.
Appliance Repair Aid
http://www.applianceaid.com/