This only happens intermittently (like when the entire family is here for Christmas!!) but sometimes when I try to turn on the oven - propane -- it won't ignite. My husband has tried different things, and we don't know if moving the stove around makes the difference, but sometimes after he does, it works again - for awhile. Totally unpredictable. He's worked on propane fireplaces and has replaced thermocouples/thermopiles -- could that be it?