Atwood Water Heater won't stay lit.

Artum Snowbird wrote:
Not sure if you have done this. There is a wire that goes in the front of the water heater with a fusible link that is designed to cut off the power to the gas relay if the fusible link melts because of a fire outside of the burner.

My fusible link was not melted, but the connection at one end of the fusible link was rotten and corroded preventing anything happening. Like you, I took the board in and it tested fine.

Once I peeled off the shrink cover over the link, I could see the problem right away, and remade the connection with a new squeeze connector and then it all worked fine.

That 'thermal link' kills ALL DC so nothing would work....electric or propane

OPs issue is spark electrode NOT being engulfed in flame, loose/dirty contacts on 'high tension' wire (at transformer and/or electrode), cracked ceramic (signal tracking to ground) OR bad circuit on control module