Atwood 8500III Furnance

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Atwood 8500III Furnance

Home > Discussion Forum > Mechanic's Corner (general)

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All Messages in Thread	Author	Date
Re: Atwood 8500III Furnance	Ernie	10-13-09
In my Coachmen Class C motor home, my furnace comes on and everything works fine until the fan starts making a high pitch sound. I'm thinking that is is probably the bearings in the fan motor. Do I have to remove the furnace to get to the fan motor and if I do how do I remove it?
Re: Atwood 8500III Furnance	Keith	10-13-09
Hi Ernie, No you don't have to remove the furnace. Unless you have an Atwood without an outside access door. Saw my first one last year... what they'll do to save money and make things harder for others. Here's how to replace it. Good luck Turn off propane, remove one screw from the timer relay (has 4 wires going to it on left front cover) loosen the other and pull it loose. Remove 4 screws from the plastic cover it is on and remove the cover, remove the PC board, remove the exhaust tube, take the propane line loose, take the igniter wire(red)loose and one quick disconnect wire (both on propane line side), remove 3 - 4 screws from rear that hold the burner in and one on the round edge, pull out the burner, loosen set screw on the small fan, hold the large fan and rock the small one while pulling to remove it. There are 3 hex screws behind the small fan remove them and you should be able to pull the motor and blower fan out as one assembly. Remove and install fan on new motor , reverse all this to install. You may have to change one wire connector on the new motor to hook it up. Pay attention to where the motor wires were connected as the motor will run backwards if you reverse them. Hope this helps, good luck! Keith Note: this is for II & III series. IV is similar, but the motor is held in with a hose clamp, it isn’t hard to figure out the difference‘s.

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