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Old 04-25-2014, 04:10 PM   #1
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Humming noise

I have a 1987 eldorado motorhome with a fuse and breaker panel close to the floor by the oven. I noticed a humming noise and the condensor getting warm. I turn the one breaker off and it stops. My frig don't work long after I turn off the breaker. The house batteries are deep cycle and are fully charged.any ideas why it's humming?

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Old 04-25-2014, 04:29 PM   #2
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I believe the early years that fuse box also has the converter with a cooling fan inside which is making the humm noise.

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Old 04-25-2014, 04:48 PM   #3
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It doesn't know the words?
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Old 04-25-2014, 05:13 PM   #4
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I would agree that it is the converter. May not even have a fan. Might just be the humming from the coils.
Palm Springs, CA - 2005 National Tropi Cal 370LX on a Freightliner, Cat 350 power. Towing a Rinker R1 - Lake Havasu Bound!!
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Old 04-25-2014, 07:18 PM   #5
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The "Condenser" is a strange term on an RV fridge, it does not exactly have one.. And what it has instead is SUPPOSED to get warm (heat exchanger).

On many Trailers and quite a few motor homes as well the power distribution panel has both 12 volt fuses and 120 volt breakers behind a single last door (I say it that way because if said panel is in a cabinet, the cabinet door does not count, only the last door) and the model will likely be plastered on said door (inside perhaps).. one common one on older rigs is the Magnetek 6300 series, which very clearly does not know the lyrics so it hums the 60HZ chorus.

More modern RVs have the Parallex 7300 which I do not know as much about but it too can hum I suspect.

What is huming? The transformer that brings 120 down to around 9 VAC (Do not ask but that's the voltage if you want to end up with 12 DC, I DO know why)

I even know why they hum.

NOTE: IF you have the Magnetek.. Consider an upgrade. Progressive Dynamics makes a drop in replacement for the "Guts" of that beast that is about a thousand times better than the 6300 ever was.
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Old 04-27-2014, 06:49 AM   #6
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I was wondering if the humming was in tune.
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Old 04-28-2014, 01:47 PM   #7
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I was told it could be the breaker itself or the bus..I will find out when I take it apart
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Old 04-28-2014, 02:01 PM   #8
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Originally Posted by Capn_Dave View Post
It doesn't know the words?
Beat me to it!

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