The oven burner is not igniting. This model runs on pilot lights. It is probly from 1998 as this came in our modular home we just bought. It will light if I hold lighter in sensor area and then put lighter to burner then it lights. The pilot light in oven is on normal and when oven is turned on to light I can see the larger pilot to heat up sensor to turn on ffuel to ignite burners but it does not ignite burner unless I put lighter to burner then it will light? Jim L