Originally Posted by cooperhawk
The rear furnace in my 1985 345 is an Atwood Everest Star model 7900 II/ 8000 II. The furnace is in fine shape, but the circuit board is corroded and shot.
I ordered a new board from Dinosaur Boards, however this furnace is equiped with what Atwood describes as a "single sense ignition system which allows the ignition board to spark and sense flame through the same wire and electrode."
The new board wants a separate wire from a flame sensor and of course, ignites the furnace for 20 seconds and then shuts off the gas.
Has anyone delt with this problem. I could run a splice from the dual purpose wire to the flame sensor tab, but I am worried that the spark surge could be too much amperage for the flame sensor portion.
And, oh yeah, I have run several searches on the forum with no joy,
Which Dino board do you have? The UIB-small
, which is the one that you 'should' have, will have no problem detecting 'local sense' (thru the igniter wire) as it is set up this way from the factory. If it isn't sensing the flame, either the board is defective (highly unlikely with a new Dino board) or your electrode is corroded.
Try cleaning the electrode tip and be sure that your igniter wire is sound and in tact with no compromises in the insulation, and that all connections are clean and tight.
Also, try running the flat connection plug to the board on and off the board a few times to clean that also.
If all else fails....call Dinosaur tech support!