While you wait for answers, we may have found some information which could help you.
Click here for Replace Element Ovenfan works, element does not?
Westinghouse 688 wall oven timer?
Westinghouse Freestyle electric wall oven 688?
outside of ring of ceramic not working?
Westinghouse Oven 688?
How can I fix my Thermostat control for Westinghouse model KB251RDM2 ?