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Old 10-16-2008, 09:55 PM   #1
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'Revving' Converter

On our first weeklong trip, the converter (WFCO WF-8900 series, 3 stage) starting making a higher-pitched sound like a small engine being constantly revved. It would go on for a few minutes, then stop. From what little I could get from the manual, it may be having trouble switching between modes?

I tried cycling all the breakers, unplugging the 7-pin from the truck (since we were hitched up to depart early), and then tried shutting off a light. It stopped. It seems if I switch on one too many lights, the noise returns. So I figure a certain amount of current load is the trigger.

Anyone seen this before? Simple fix, or does it sound like a warranty service visit for the converter?
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Old 10-16-2008, 10:05 PM   #2
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It could be the cooling fan in the converter. It should only come on when the unit is hot and putting it under a load might cause it to cycle on.
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Old 10-17-2008, 09:23 AM   #3
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Our Intellipower does that. It is the cooling fan inside the unit, and is completely normal. Providing, of course, our revving sound and your revving sound are the same thing.
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Old 10-17-2008, 10:09 AM   #4
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Quote:
Originally Posted by azflycaster View Post
It could be the cooling fan in the converter. It should only come on when the unit is hot and putting it under a load might cause it to cycle on.
I agree. Bet it's just the bearing in the cooling fan itself.

If you don't want to put up with the noise, it might be surprisingly simple to open it up (power/batteries disconnected, of course) and pull just the fan, then take it to someplace like Fry's to match up a replacement. An hour + a few bucks and you're good to go.

Or, you could give Randy a call at bestconverter.com, for a better diagnosis.

Cheers,
-jd.
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Old 10-19-2008, 04:27 PM   #5
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WFCO uses a load controlled cooling fan. I guess it does sound like a small electric motor revving but they all do quite frankly. As long as it doesn't sound like a squeal or binding, its probably normal.
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Old 10-19-2008, 07:57 PM   #6
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I appreciate all the insightful replies. I guess the irregularity of the noise is what bothered me. But it has not come back since the first night we noticed it. I wonder if it might also have been temperature-related, as it was our first cold night/below freezing?
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Old 10-19-2008, 09:16 PM   #7
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Hi Whizzo, yes it probably was because the furnace fan is the largest consumer of DC power after battery charging and combined, it will work the heck out of your converter. I left out the fridge and that is also a battery destroyer while on DC so if you have a 3 way fridge, keep that in mind.
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