Whirlpool range problems

Ha guys, I’ve got a problem with a gas whirlpool range that will not light. The stove top works great but when you try to bake or broil the oven won’t start. The owner said it use to beep when you started the oven but know the light on the control panel lights up but no beep. If I start the self clean cycle it heats up. any help would be great. The only thing I could come up with was maybe a relay but I don’t know.