While you wait for answers, we may have found some information which could help you.
Click here for Wall Oven Grillfan works, element does not?
How can I fix my Thermostat control for Westinghouse model KB251RDM2 ?
Westinghouse 688 wall oven timer?
outside of ring of ceramic not working?
My Westinghouse 688 freestyle wall oven?
How to remove a element from a oven?