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The sensor when cold should allow power through it. If it is open internally it will not allow power to get to the ignitor. If you have a meter it should show continuity or 0 on the meter. If you get OL on the meter or no action on an analog type meter the flame sensor is open or dead internally. One way to check it without a meter is to bypass it by touching the 2 wires together while the dryer is operating. (not recommended for the novice) What it does is allow power to get to the ignitor, when the ignitor gets hot enough it allows the ignitor to shut down. Power however is shifted to the solenoids whenever the ignitor is hot only. So heat from the ignitor hold open one of them coils as long as it is kept hot by fire. If for some reason the fire was not there the ignitor would cool off and the gas would be shut off. Clever ain't it? How about a home video showing the operation in action?
Remove the bottom tray in oven compartment...... usually 2 screws at the rear... Turn it on to bake and see if ignitor glows if not test ignitor for 120v if you have 120v replace the ignitor. If it glows and still does not light burner after a few seconds the ignitor is weak replace it. (The gas safety valve has to receive a certain amount of power that must flow through the ignitor for the burner to ignite a weak ignitor will not allow enough power to flow through it). If you are not getting 120v trace the circuit.
if your oven has a hot surface ignitor it will be visible when looking in the broiler section of your oven if you have an upper and lower burner the bottom of oven will have to be removed to find the ignitor when oven is turned on ignitor should glow a bright red the ignitor works off 120volts if you have the knowledge and testor however a visual inspection if ignitor does not glow and part of the igniter appears white with a smaal crack line in the middle it is probbably broken at that point also if you have testor you will have a continuity reading threw the ignitor
more than likely its a bamke ignitor, one sure way to find out is the range will come on but never get hot and never get above starting temp
remove the bottom panels and you should be able to see the ignitor, turn on the range as normal and visually inspect to see if the ignitor glows
no glow,,,, there you go
call sears repair and tell em you need part number
9758079 ignitor bake
its about a 5 on a 1-10 difficulty ,,,,,unplug the range