I've replaced the controller boards in Atwood and Suburban furnaces and water heaters. It's very easy and I never had to remove the W/H or furnace. I recommend the Dinosaur Electronics replacement boards, which have worked well for me. They're available on eBay and other places, usually much less expensive than the originals from Atwood or Suburban. On the Dinosaur web site, if I remember, there's a big chart that tells you which of their boards fits which W/H or furnace.
All of this assumes that your furnace has direct spark ignition. If it's got a pilot light instead, I have no idea whether Dinosaur makes replacement controller boards.
Me, now, I'm going to have to pull the furnace out of my m/h soon, because the blower motor bearings are totally worn out and I'll have to replace at least the bearings and probably the whole darned thing.
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-- Carl
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