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The ifc or integrated furnace control board. Answer to wmproops question.
The ruud silhouette gas furnace won't stay on to heat the house. The igniter lights up the pilot burner for a few seconds...

Service manual

I replaced the igniter and the flame sensor. The first burner ignites for a few seconds and when the others should ignite it shuts off and tries again. Could it be the control board?

The fan comes on, the igniter lights the first burner for about 3 seconds then when the other burners should ignite it goes out and in a few seconds it try's again. I replace the flame sensor. What...

Is it the gas valve or the ifc.