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Quick update fyi.
Talked to a service tech. He suspected either relay, E.C.O switch, or circuit board.
Pulled all the wires and checked all the voltages per the wiring diagram in the Atwood manual. Especially checked the ground as I suspected recent damp conditions may have corroded the ground to the control board.
After putting it all back together, it's working, but I'm not confident and am monitoring in the event that it cuts out again. Given that the tech and the troubleshooting guides all end up at "replace circuit board," and since others have said that's a common failure point, and the fact that are full time and really like hot showers, I decided to get a spare/replacement. Dealers want 200-250 for the part. Amazon sells them for 106. Offered a "local premium" to the dealers if they would come close (not match) but neither was interested. So have one on order from Amazon.
If I learn any more, will come back and post it.
Thanks!
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