Take a look at the gas supply. If the range is getting gas, turn on the burner. The range gas supply valve should be opened if the burner isn't getting gas. The upper oven bake igniter could be weak if the surface burner gets gas and the range gas supply is okay. The bake igniter can light up when you start the upper oven bake mode. The upper oven igniter should be hot enough to ignite the gas from the oven burner. The igniter has a safety gas valve. The igniter needs to be hot enough to light the burner gas in order for the valve to open. Plug the range and replace the igniter if the upper oven igniter doesn't heat enough to open the gas valve. Check the wire harness connections on the upper oven bake igniter and upper oven gas valve if the igniter doesn't glow. Fix broken wires and connect loose wires. Use a multimeter to check the bake burner igniter resistance. You can measure between 45 and 400 by using the igniter. If you measure resistance, replace the igniter. Check the resistance through the gas valve if the igniter is ok. The upper bake burner has a gas valve that you can use to measure resistance. Measure infinite resistance and replace the gas valve. The upper oven control board has wire harness connections. Fix broken wires and connect loose wires. Check the resistance through the yellow wire on the control board and the white wire on the wire harness 45 to 400 ohms of resistance is what you need to measure. The circuit might have a broken wire if you measure infinite resistance. The control board wiring can be traced through the igniter and gas valve. Fix the broken wire. The resistance of the upper oven temperature sensor can be measured through the wires. You should measure at room temperature. The upper oven temperature sensor should be replaced if resistance is off. The control board for the oven isn't sending current to the igniter if the temperature sensor resistance is okay.
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