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It actually could be a number of things. It could be the gas valve is stuck and not opening the main valve, it could be the control module and the gas valve isn't getting the voltage to open, it could be the igniter isn't sensing the pilot and sending the signal back to the module that the pilot is lite, it could be your gas supply isn't sufficient, it could be the orifices to the burners are restricted and gas isn't getting down them. You would need a volt meter, a gas pressure tester, and the ability to use alligator jumper wires to bypass some things to see what the problem is.