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Old 12-01-2011, 09:38 AM   #1
stiles watson
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Atwood Heater

While I was finishing washing my truck, the lady next door asked if I knew anything about RV furnaces. Her's had stopped igniting. She has a 2006 Hurricane motor home made by Thor. My Big Sky has an Atwood albeit an newer model mounted differently. However, there was enough similarity for me to recognize the works. Atwoods have a diagnostic LED on the control circuit board and the meaning is written on the blower housing. We looked at the diagnosis, but I did not understand what it meant.

After calling Atwood Tech Dept., I did some multimeter testing. I did not get the required 12 volt reading. Further instructions led me to remove the blower housing. On the back side of the housing there is a sail switch. So after I got it off we also needed to tested the two terminals on the switch for 12 volts. Bingo! I got twelve volts. Tech told me to put it back together and test the white wire at the circuit board again.

After some issues with small screws in remote, dark places, we finally got it back together after two tries. We turned the unit back on to determine if the blower and housing were in properly. Before I could test the white wire, the furnace ignited.

I really don't know what I did. Perhaps there was a loose connection, or the sail switch was stuck or corroded, or another contact was not making a solid connection. Whatever was the problem, it has been running since. The lady, a single traveling nurse, is exceedingly happy because it got to 32 degrees here last night.
 
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Old 12-01-2011, 10:11 AM   #2
camper4
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I had a similar thing happen with mine two years ago. I pulled it apart and disconnected all,wires and plugs. Re assembled and it has run fine since.
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Old 12-01-2011, 10:24 AM   #3
drsmart
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Good work Stiles. I hope the lady next door knows how to bake a pie
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Old 12-04-2011, 01:13 PM   #4
jackel1959
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What a great guy you are Stiles. Did she at least make some cookies for you? Montana owner's are the best, kindest and most willing to help.

Jack
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Old 12-05-2011, 02:06 AM   #5
Ozz
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Thanks for helping the lady out, you are a good neighbor, and a good man.
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Old 12-05-2011, 03:32 AM   #6
bob n pam
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Good job, Stiles!
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Old 12-05-2011, 05:52 AM   #7
stiles watson
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Thanks for the kudos. My real purpose in posting was to disseminate some useful info about the Atwood furnace. The rest was just my tale to wrap the important info. Pertinent info includes:
  • Diagnostic LED indicator on the circuit board
  • Diagnostic interpretation printed on the blower cover
  • Where to check for 12 volt current
  • Where to find the sail switch on the unit
  • And above all, that Atwood Tech Dept was very forthcoming in helping.
I did not mention that when you test the white and blue wires, the blower needs to be in the "on" position. We also vacuumed five years worth of lint accumulation out of the compartment.

Hope you never need this info.
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