[ScubaSteve]

I haven't been able to find the answer I'm looking for so far so I thought I'd try asking about my problem directly.

I have a Goodman furnace that I tried to start up a few weeks ago for the first time since last winter. The furnace will light without an issue and the indicator light will remain on (meaning everything is fine) but after a few seconds the flame will go out. This process is repeated three times before the system shuts down and the indicator light begins to slowly and continuously blink. I can't find an error code to correspond with this pattern of blinking.

I read that the a flame that burns for a few seconds and goes out indicates a bad reading on the flame sensor so I replaced it but the problem remains. If it helps, the furnace is on a concrete slab in a dirt floor basement. Any advice is greatly appreciated.