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I am curious as to what elevation you are at when experiencing the problems. We have the very same issue when at elevations higher than 5K'. Atwood says furnace "is not designed to work above 4K' ", or 4500, depending on who answers the phone/email. We had replaced everything except the board (regulator, burner, hi-low switch, sail switch) to no avail. We have now replaced the entire furnace, and will test it over the next few months as we head west into elevations again. Crossing our fingers that it will work.
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