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Old 09-10-2014, 12:46 PM   #1
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Atwood 8500-IV Furnace Blower Destruction?

I am camped at an RV park five miles from Glacier NP. At 5:00 am this morning, I was awakened by what sounded like a gunshot and glass shards falling. Checked everything and couldn't find anything wrong. The furnace was running at the time. I still have heat (43 deg's outside) but the high temp limit keeps cycling the burner. I suspect that the blower fan (double squirrel cage) may have partially self destructed. I am able to see half the fan from inside the coach and it seems to be intact. In talking with both Thor and Atwood tech service, I need to remove the outside cover and try to access the blower. Unfortunately, it is cold and raining heavily so I am waiting for the rain to pass before undertaking the exterior access.

My question is: Has anyone else had their blower fan fail/self destruct?
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Old 09-10-2014, 01:45 PM   #2
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After The outside cover is removed - the unit is held in by about a dozen screws around a plate and gasket on the outside wall. There may also be screws into the floor inside, and the ducting. The unit when fully disconnected slides out. However with just the outside cover removed you can inspect the blower housing and motor area.
I did a wiring diagram and photos before disconnecting the wiring....
Manual and troubleshooting here:
http://bryantrv.com/docs2/docs/hflamefurn04.pdf

My furnace was also running into the high temp shutoff and the blower wheel was warped. Part of the ducting entrance was blocked by a piece of carpet. Separating the plastic blower from the metal flame wheel was a chore....
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Old 09-10-2014, 03:09 PM   #3
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It finally stopped raining. I removed the outside cover and sure enough, there are pieces of the blower fan sticking out the bottom. Waiting for a local mobile service guy to get the part and come to me and install it.


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Old 09-10-2014, 06:48 PM   #4
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Repairman just left. Half the blower was missing.


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Old 09-10-2014, 08:05 PM   #5
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Mine did that 3 years ago. The plastic fins of the squirrel cage just flew apart. Maybe they get brittle with age? I replaced mine myself.
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Old 09-10-2014, 08:07 PM   #6
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I watched the procedure just in case it happens again.


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