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RVing message boards => Tech Talk => Topic started by: chevyman54173 on September 10, 2017, 05:44:30 PM

Title: Whistling furnace
Post by: chevyman54173 on September 10, 2017, 05:44:30 PM
I have a 2014 Cherokee Grey Wolf travel trailer. When the furnace would ignite it would whistle for bout 10-15 seconds and then go away. Since it was new I just kept running the furnace thinking the noise would go away. And it did. However, this past weekend the noise is back. After ignition it whistles for bout 10-15 seconds. Any ideas why this does this and how to fix?
Title: Re: Whistling furnace
Post by: ChasA on September 11, 2017, 10:01:03 AM
Which tunes does it know?  Dixie?
Seriously though, where is the sound coming From? Do you hear it at an output vent or at the return?
Title: Re: Whistling furnace
Post by: chevyman54173 on September 11, 2017, 10:40:40 AM
Good question. I did not try to figure out which end it was coming from. When I get a chance I will check it out.
Title: Re: Whistling furnace
Post by: whokares2 on September 11, 2017, 05:43:39 PM
Sounds like the blower motor bearings are failing.  Mine did the same, replaced the blower motor this spring and it's very quiet now.  Not that hard of a job.
Title: Re: Whistling furnace
Post by: Kheren on September 11, 2017, 05:48:20 PM
Ours did this last winter and over time it got louder and longer, not fun at 2am! Haha. It was in fact the bearings in the blowing motor, replaced and fixed.
Title: Re: Whistling furnace
Post by: chevyman54173 on September 11, 2017, 07:47:54 PM
Was gonna check on the noise and of couse it doesn't do it now. Hard to believe it would be the bearings in the blower motor since it did the noise when it was brand new. And then not do it for 4 years. When it does do it the noise only lasts for bout 15 seconds then goes away. And it only did it right after the furnace ignites.
Title: Re: Whistling furnace
Post by: Ernie n Tara on September 12, 2017, 10:32:57 AM
That's not unusual for a blower motor.  The bearings loosen a bit permitting some sag at low fan speeds. As the fan speeds up, the fan will tend to stay in plane centered on the shaft and quiet.

Ernie
Title: Re: Whistling furnace
Post by: chevyman54173 on September 12, 2017, 01:38:24 PM
So basiclly this camper furnace was assembled with a bad bearing in the motor?
Title: Re: Whistling furnace
Post by: Kheren on September 12, 2017, 04:43:21 PM
When we had the issue I read many times that people got a bad "new" one. It doesn't necessarily mean the motor is bad but the bearings, no telling how long it sat in the factory or store before being sold. I was told you can lube the bearings but it's a chore and far easier to just replace it. Maybe you could look into to that.
Title: Re: Whistling furnace
Post by: chevyman54173 on September 13, 2017, 05:14:29 AM
I wil look into a blower motor during the offseason.
Title: Re: Whistling furnace
Post by: whokares2 on September 13, 2017, 07:05:37 AM
I agree with the Old Age from the shelf.  They have a date stamp on them, the one I replaced in April was a 2014, did I mention Made in China!
Title: Re: Whistling furnace
Post by: utahclaimjumper on September 22, 2017, 06:42:40 PM
 The "bearings"are actually oilite bronze bushings and when worn or out of alignment will osculate at a high frequency.>>>Dan
Title: Re: Whistling furnace
Post by: retusn on September 22, 2017, 09:49:10 PM
What furnace brand and model.  I had the same thing happen a couple rvs ago.  I took the motor out and found out the shaft was completely dry.  Lubed it, put it back together and it ran as quiet as it was supposed to.