Viking Range Oven Not Working

Hi Everyone,

My Viking GAS range main oven was intermittent, now not working. I used to get the oven to switch on (red light would glow and it would fire up) when i went past 350 degrees, and the broiler worked fine, but would turn off below that temp. Now I can still hear clicking when I turn the switch on but no red light or ignition… any ideas or things i can test? Thanks!

James