If the main burners ignite with the thermostat off, you could have a bad t-stat or a bad gas valve. If the gas valve is a combination safety, (all built into one), check your wiring connections.
If I have the symptom right, you should call a professional.
I have an Imperial 10 burner/dual oven stove; model IN-10R. My oven pilots will not light with the...
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I have an Imperial 10 burner/dual oven stove; model IN-10R. My oven pilots will not light with the Piezo starters; there is spark at the Piezos. What is wrong?