The ignitor comes on until there is enough current through it to open the gas valve. Then the valve opens and it ignites.
After that a seperate thermocouple will provide the power to keep the gas valve open as the ignitor circuit drops out. There are some that keep the ignitor on the whole time though.
If your oven won't open the gas valve and light and you can see some glow from the ignitor then 90% of the time the ignitor is bad as it isn't passing enough current to open the valve.
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