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Atwood furnace 8500 iv joey 10-7-15  
I turn on the heat. it comes on then goes out, comes back on for a few sec and turns off.
Re: atwood furnace 8500 iv BUBBA THE BUS TECH 10-7-15  
WHat does the fan do?

You could have 2 common problems and a whole host of uncommon problems.

The gap between the ignitor and the point it sparks to is to large
The high limit switch is faulty

Less common: Bad corroded burner, heat exchanger with a hole in it. Poor LPG flow. Bad board, Intermitant sail switch, somebody put a screen on the exshaust and a whole bunch more.
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