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This question is not specific enough for a good answer. What is the appliance? A furnace? A cooktop burner? An oven?

The first thing to check would be the igniter, which is what typically "lights" the gas coming from the valve.

You can check an igniter with a simple continuity test using a test meter.

If the pilot is lit, then there is no igniter, or the igniter lites the pilot, so if the pilot

is lit how could it be the igniter.

Bad thermocouple, this tells the gas valve that the pilot light is lit, if the gas valve does not know the pilot is lit it will not allow gas to come out of the valve, this is a safety feature so your unit does not blow up.

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Q: Pilot light is on but flames wont light when you turn up the thermostat?
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