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Hi, that usually means that the flame sensor needs to be cleaned, you can find the sensor at the last burner in th flame path I'll post a pic of a typical one and the typical location of it, take a piece of steel wool or light sand paper and clean the metal part of it , then recycle the furnace. thanks Mark
on the bottom photo of the furnace on the left I wrote in where the flame sensor is typically located, thanks Mark
Your solution worked, thank you very much!