This is a GOOD example of what happens when someone CHANGES a LOT of parts with NON OEM parts.
It is VERY difficult to determine cause when you have replaced with non standard parts. That said, the FIRST place to look is to replace the Time delay (fan relay) on the Furnace. THAT is the gateway to the fan motor. From your post, it seems you have 2 controls now for the fan motor----The Dino board and the original fan relay which should have been removed when you install a upgraded Fan control module board. I don't understand WHY you left the Fan relay in place when you went to the Dino board. Also, there is no reason to have to blow out any perceived residual LP in the chamber. The purpose of a sail switch and the delay of 20 to 30 seconds before ignition is to purge the chamber. Doug
