Photomike
Southern Alberta
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Our furnace makes a noise when starting up (only when cold). A very loud squeal that goes away when it is warm 30 seconds or a minute.
Has anyone had/has this? Has anyone pulled the blower motor out or fan? How hard is this?
I will try and get the make and type all it has is the brown metal front with no name on it so I will have to look for the manual.
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tvman44
Southwest Louisiana
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Bad bushing on fan motor sounds likely to me.
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Sportsman Matt
Blackstone, MA
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Sounds like either the bushing on the motor or the fan is loose. Have it on my current camper, just learned to live with it as it's more of a PIA to get the heater out than it's worth.
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Photomike
Southern Alberta
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Sportsman Matt wrote:Sounds like either the bushing on the motor or the fan is loose. Have it on my current camper, just learned to live with it as it's more of a PIA to get the heater out than it's worth.
I was really hoping that that was not the case 
The good thing is that on a cold night when I run out of propane it cools off and starts to make the noise to let me know I am out of propane. But I am a little worried at -30 it will go completely and I am without heat.
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skipnchar
Topeka Kansas USA
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Another betting on a bad bearing in the fan.
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Reddog1
El Dorado, CA
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Mine makes noise also. It can really sing. I have had the heaters apart before, but it has been a while. Usually about four to wood six screws holding it in, the gas line, and wires.
I bought a new motor for my furnace last week. I had the choice of the motor from the of the furnace manufacture ($125 about), or a replacement motor ($90). The parts guy said they were both made by the same company. It is on the bench, waiting for me to get time to install it.
I am not aware of any of the furnace motors you can service. You can take the motor out, oil the bearing via the shaft, but the oil does not last long. I do not think it is worth the trouble. The motors I have seen are riveted together.
Wayne
* This post was
edited 11/13/09 11:34pm by Reddog1 *
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JoeChiOhki
Keizer, Oregon
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If your heater is a brown rectangle with little louvers pointing up and down, its and Atwood heater (Very likely as Matthew_B has that style of furnace and his screams in a very annoying pitch when its running, learned never to park your bed within earshot of his furnace exhaust  ). If its a brown rectangle with large rectangular opening that just shoots hot air straight out, that's a Suburban Propane (I have this model with a deflector that the last owner made so it shoots the hot air straight up and down instead of straight out).
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Camp, Forrest, Camp!
Boise, ID
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Mine did the same thing when I bought it and I couldn't take being woken up all night every time it kicked on. I bought a new fan for about $80 (5 years ago) and put it in myself. It was pretty straightforward and took less than an hour total.
Make sure you disconnect your battery and power to the camper before you start. When sliding mine out, I touched the metal trim around the opening and zapped my circuit board which cost me $150.
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Reddog1
El Dorado, CA
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I bought my Atwood Furnace motor from AAA RV APPLIANCE PARTS. You will need the model number.This is the Furnace model selection link. This is the Atwood FA-78 Series. You will have to contact them for prices.
Wayne
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