I need to followup on the original post found here:
http://www.thorforums.com/forums/f8/...-fix-9943.html
We normally use our electric heaters while we are traveling in the winter but due to a family illness -we have had to go back to the land of the cold in Kentucky. Weather forecast is horribly cold for this week (mid teens) and I fired up the furnace to make sure we were ready. What I found was NO FIRE in the furnace = no heat for the basement. Fortunately we had a couple of days before the cold set in.
Symptoms again:
1. Fan started up.
2. Slight smell of propane.
3. Ignitor was heard sparking.
4. No ignition
5. Furnace attempted to start 3 times.
6. After 3 failed attempts the control board began the 3 blinks, 1 second, 3 blinks coding indicating a soft lockout.
7. After about 30 minutes furnace soft lockout cleared and sequence above was repeated.
8. Using the reset button on the furnace, this sequence can be bypassed and the soft lockout is reset.
After reading a great deal from several sites (as I'd already done), I decided it was either a clogged burner or the controller board. Got hold of Atwood customer service and they indicated that these two issues sounded correct. The emailed me the specific manual. I found the controller board on line but decided to try and clear a clog.
I opened up the furnace on the outside of the coach, shut off the propane, removed the propane lines, fired up our stand alone compressor, reset the furnace, waited for the ignitor click and then started blow air into the furnace propane regulator. I did this for each of the three cyles, hit the reset again and then blew more compressed air into the regulator.
I then reconnected the lines, hit the reset button and ShaZZam - igniting. I let the furnace run some more, shut it down and then had it start back up. I still had the love - furnace is working great, ready as we can be for the fierce cold.
Here is the specific manual for the AFMD 35141 Atwood Furnace. Hope all this helps.
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