[ChuckS]

After 3 attempts to ignite furnace will go into lock out mode. To clear turn thermostat off. Then back to furnace

Since fan is coming on for furnace perhaps you’ve just got air in the feed line and need to purge it.

Try relighting several times listening outside at furnace exhaust for a pop pop sound indicating DSI is sparking.

If you hear that and after a few lockout resets it wont ignite then I’d be betting on furnace control module.