reset switch?

My Dacor PGR-30 single gas oven won’t preheat. The oven indicates it’s on, but it doesn’t get hot. I’ve read elsewhere about a high limit switch, but I took the latch cover off and couldn’t find it. Does this model not have one? If there is a sticky or another thread pertinent to this problem I haven’t found it. If someone can please give me a hint in the right direction I’d appreciate it. Also, I wonder if there is an igniter or something that needs to be checked and replaced. I can fix cars and motorcycles, but appliances are new to me.
Thanks
JD