If you are unable to light the oven, first make sure that all of the knobs on your gas oven and stove are turned off. Next, try disconnecting any electrical cords from the oven (this includes the power cord, plug, and wall outlet). After that, check to see if there is a fire hazard in the oven. If there is no fire hazard and you still cannot light the oven, then you may need to call an appliance repair technician.