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Old 10-10-2012, 01:08 PM   #1
Junior Member
Join Date: Oct 2012
Posts: 1
Atwood furnace-no heat!

Hello everyone, I just joined today to get some info on my Atwood Hydro flame 8900-III series furnace. It quit producing heat last week, the blower runs, but the furnace fails to ignite? I am an handy-man I enjoy fixing things my self, as I was an ex-service man for a large compressor manufacture. Any way I would like to receive some details on fixing my furnace and a possible service manual. It is in my 2000 year Breckenridge 44' Park Model.

thanks again

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Old 10-10-2012, 07:33 PM   #2
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Fleetwood Owners Club
Join Date: May 2012
Location: NC
Posts: 1,682
Try these to see if it helps

8900-III Series Furnace.pdf


Mark Anderson - Nebo NC - western NC - RV Restoration tech - 9 Doggies - Outdoors person
1990 33ft Wilderness Cimarron 33X
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Old 10-10-2012, 07:53 PM   #3
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Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 23,948
Last Jan, on the 2nd, I left a nice sunny town in GA and headed NORTH to South Carolina (only 3 miles from GA) When I hit the ALL RETRACT button on the jacks it was t-shirt weather,, When I extended them it was 25(f) out, Wife was crying about how warm it was in Georgia (Daughter posted the morning temp on facebook later that morn...27)


Thank heavens for electric heat. (And extra blankets)

Now there are several possible issues.. Ranging from "Oh dang I forgot to turn the propane on" to empty tank to need for Preventative maintenance to bad part.

For example.. Earlier I'd had a "Sometimes it works" issue, turned out to be point spacing on the Direct Spark Ignition system (The spark gap was 2x what it should be) fixed that and it worked for a full year.

This time it was the control board.. Near as I can tell a glitch popped the flame sensor circuit.

IF, and I stress IF that is your problem May I recommend a Dinosaur board (likely the Fan-50, that's what mine took) more in a second.

But other things to check.. Does it actually ignight? IF you are outside and your partner activates it you can hear the change in sound when the burner ignights Very clearly, You can feel the heat at the exhaust.

IF it does this clears the propane system, it may well clear the burner and gas valves and such, This leaves the flame sensor (Which is also one of the ignigition points) and the control board (Which was my problems) Try cleaning the rod of the flame sensor first.

If it's not lighting, Then do the full PM job on the burner (Clean and adjust)

Now, I happen to be trained as an electronics techinician (Certified even) plus I've over 40 years as a ham radio operator, I have designed and built some of my own gear.

The first thing I noticed when I opened the box with my new Dino board was the quality of the soldering and overall construction. First rate, Very well built, IN the US by the way, by crafstmen who know their business.. Further investigation showed a couple of protective devices scattered about one of which I suspect is there specifically to prevent what I think happened to my Attwood board. The attwood board (Which cost like 2.5 times what I paid for the Dino board by the way) was not nearly as well built, And lacked that protective device.

So far (10 months later) the Dino board is still doing just fine. I expect that when it hits 10 years I'll still be saying that.
Home is where I park it!
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