I have a 36" Imperial true commercial range, has 4 burners, a salamander broiler/griddle and the lower oven. Oven is not lighting. I flip the on/off switch and have the temp setting about 250 and the burner does not turn on. Indicator bulb for burner on does not come on. I smell slight gas smell so i shut it off. Cannot find model number on plate, paint peeled off tag and cannot make out any numbers.