RED LED Flashing 3X....Ignition Lockout Error Code
Circuit board WET?
Dry it using Hair Dryer...then try again
If it works you might want to consider a Relocation Kit
(Atwood KIT includes a NEW circuit Board WITH a plastic Bracket that lifts circuit board up....make your own bracket)
Relocation Kit...circuit board is generic to almost all Atwood furnaces/7900 thru 8900 AFS, AFM, AFL, etcIf not WET....circuit board is at fault
Dinosaur Electronics Fan50Plus Circuit board for replacement
Better quality circuit board
Dino Fan50Plus